Ideally, the solution would simplify lines 4-9 to: gray_with_alpha = cv2.cvtColor(rgb, cv2.COLOR_RGBA2GRAYALPHA) With the added bonus that there would just be 2 channels written to file, as opposed to 4. Source Project: OpenCV-Computer-Vision-Projects-with-Python Author: PacktPublishing File: chapter2.py License: MIT License. The rubber protection cover does not pass through the hole in the rim. I think this does not really work because you cannot convert back to RGB . Parameters:filename: A string representing the file name. Next, we need to parse the image to grayscale. How to upgrade all Python packages with pip? img = cv2.imread ( "flowers.jpg") Here I am passing the image name "flowers.jpg". cv2.imwrite ('sample_put.jpg', cv2.cvtColor (img, cv2.COLOR_RGB2BGR)) CGAC2022 Day 10: Help Santa sort presents! shape) # cv2.IMWRITE_JPEG_QUALITYjpg010095 . MOSFET is getting very hot at high frequency PWM. By profession, he is a web developer with knowledge of multiple back-end platforms (e.g., PHP, Node.js, Python) and frontend JavaScript frameworks (e.g., Angular, React, and Vue). We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. I am promoting my comment to an answer: The easy way is: You could draw in the original 'frame' itself instead of using gray image. You can see that we have defined a function called the, As an additional note, which will be necessary for converting to grayscale, the, Next, we need to parse the image to grayscale. After merging the grayscale image into three channels, we can now apply color onto the image. We can use the following value for the flag parameters in the cv2.imread() function. You have to just pass the path of the image as an argument. Why is Singapore considered to be a dictatorial regime and a multi-party democracy at the same time? We will read the image using the cv2.imread() method in this function. Why did the Council of Elrond debate hiding or sending the Ring away, if Sauron wins eventually in that scenario? Add a new light switch in line with another switch? You just have to append the following code inside the function to open both images. How to vertically align an image inside a div. How does one convert a grayscale image to RGB in OpenCV (Python)? Should I give a brutally honest feedback on course evaluations? Asking for help, clarification, or responding to other answers. We can use cvtColor() method to convert a BGR image to RGB and vice-versa. Convert BGR and RGB with Python, OpenCV (cvtColor) So far, it has been processed based on the grayscale image, but it is also possible to process the color image like cv2.threshold() with the same idea as the above example.. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? The first approach, assuming you want to still use skimage to read and cv2 to write is to use cv2.cvtColor to convert from RGB to BGR.. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. If so, can I convert the grayscale image back to RGB to visualize the contours in green? I did some thresholding on an image and want to label the contours in green, but they aren't showing up in green because my image is in black and white. learnopencv.com/why-does-opencv-use-bgr-color-format. import cv2 import numpy as np # load a color image as grayscale, convert it to false color, and save false color version im_gray = cv2.imread('test.jpg', cv2.IMREAD_GRAYSCALE) cv2.imwrite('gray_image_original.png', im_gray) im_color = cv2.applyColorMap(im_gray, cv2.COLORMAP_JET) cv2.imwrite('colormap.png', im_color) # save in lossless format to . cv2.IMREAD_GRAYSCALE : Grayscale . Let's try this out with the following simple test image: As you can see, red and blue channels are visibly swapped. When code is cv2.COLOR_BGR2RGB, BGR is converted to RGB. We will show both images to compare the converted image with the original one. # Function to convert RGB Image to GrayScale def convertImageToGray (args): image = cv2.imread (args ["image"]) gray = cv2.cvtColor (image, cv2.COLOR_BGR2GRAY) filename = f" {os.getpid ()}.png" cv2.imwrite (filename, gray) print ('The image is converted to Grayscale successfully') You can see that we have defined a . The first approach, assuming you want to still use skimage to read and cv2 to write is to use cv2.cvtColor to convert from RGB to BGR. Example 1: Reading and Saving Image . Or You will get into trouble. OpenCV uses BGR image format. (test.jpg) . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. This is where you would have to add more advanced preprocessing methods. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? Let us save the same image in JPEG format by explicitly mentioning the cv2.IMWRITE_JPEG_QUALITY parameter value as 100. To do it, we have to call the, As the first input, this function receives the original image. However, I can't find such a function to achieve this, though I'm fairly confident 2-channel png files do legitimately exist. Hmm, maybe I shouldn't have made the sample image rotationally symmetrical. How to say "patience" in latin in the modern sense of "virtue of waiting or being able to wait"? dst = cv2.cvtColor(src, code) Refer to the following document for the value to be specified for the parameter code. As an additional note, which will be necessary for converting to grayscale, the imread()function has the channels stored inBGR(Blue, Green, and Red) order by default. You have gone from three channel to one, when you try to go back all three numbers will be the same. RGB6-1a33 . Where does the idea of selling dragon parts come from? This is because you're trying to display three channels on a single channel image. the autocomplete on my pydev ide lists CV_BGR2GRAY but not GRAY2BGR. Step 2: Read the Image. Fetch the input image using the argparse module. Better way to check if an element only exists in one array. How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? Images are read as NumPy array ndarray. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, If so, then the issue is in the fact that. Find centralized, trusted content and collaborate around the technologies you use most. The code below does not appear to be drawing contours in green. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? import argparse import cv2 import os # Function to convert RGB Image to GrayScale def convertImageToGray(args): image = cv2.imread (args [ "image" ]) gray = cv2.cvtColor (image, cv2.COLOR_BGR2GRAY) filename = f"{os.getpid ()}.png" cv2.imwrite (filename, gray) print ( 'The image is converted to Grayscale successfully' ) # Fetch the arguments . To learn more, see our tips on writing great answers. An alternative is to just use OpenCV -- use cv2.imread to load the image. Something can be done or not a fit? cv2.IMREAD_COLOR: It is used to read the image as an RGB . Appropriate translation of "puer territus pedes nudos aspicit"? Why imwirte function writes my images in BGR order? This is why the file size of the jpeg image had reduced in our first example above because it lowered the image quality. def ProcessFrame(self, frame): # segment arm region segment = self.SegmentArm(frame) # make a copy of the segmented image to draw on draw = cv2.cvtColor(segment, cv2.COLOR_GRAY2RGB) # draw some helpers . But the author of the question was not interested in using the original colors, But do you really see contours of green as the author wishes to see. thanks I suppose so.And how can I correct it please? Here are the examples of the python api cv2.imwrite taken from open source projects. To get started, import cv2 module, which will make available the functionalities required to read an original image and convert it to grayscale. The if statement inside the function performs a threshold to segment the foreground from the background. That is it. For that, we will create a numpy array with three channels for Red, Green and Blue containing random values. Does Python have a ternary conditional operator? Does balls to the wall mean full speed ahead or full speed ahead and nosedive? Indeed your answer is true and I faced the same problem, Using the right casing/module names it's certainly possible to convert from gray to BGR: cv2.cvtColor(img, cv2.COLOR_GRAY2BGR). A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. # RGB to Grayscale image = cv2.imdecode(image, 0) # display image cv2.imshow("output", image) Output: My Personal Notes arrow_drop_up. Why is the federal judiciary of the United States divided into circuits? Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? Maybe because I'm using OpenCV 3.6? The image on input (as a png) is in RGB order but the image in memory (as a cv::Mat) is in BGR order. You can check your current project folder and look for an image name like 4999.png or any four digits number.png image. We do this using both the, For details on Otsus method, see Otsus Binarization in the, Finally, once the user presses the key, we call the, How to Convert JPG to PNG Image using Python. Does Python have a string 'contains' substring method? Your problem is in the fact that skimage.io.imread loads image as RGB (or RGBA), but OpenCV assumes the image to be BGR or BGRA (BGR is the default OpenCV colour format). You can install it using the following command. This parameter contains the image we need to convert to grayscale. We can also programmatically open both RGB images and Grayscale images using the cv2 module. Save my name, email, and website in this browser for the next time I comment. We pass in a list of the three color channel layers - all the same in this case - and the function returns a single image with those color channels. So, imread() will internally convert from rgb to bgr and imwrite() will do the opposite, all under the hood. The size of picture is 512*512, after being saved, a blue picture turns yellow. In this article, we will convert a BGR image to RGB with python and OpenCV. Python3 # import necessary modules. I think the end result will still be a gray image even though you will have RGB channels defined, Draw the contour after you do the color conversion. Nonetheless, if we pass the value 0, it will wait indefinitely until a key event occurs. My image is on the right side of the following output. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. thanks! Imwrite PNG specific flags used to tune the compression algorithm. As the first input, this function receives the original image. You have entered an incorrect email address! The effect of IMWRITE_PNG_STRATEGY_FILTERED is to force more Huffman coding and less string . Use cv2.imread() for input. Or what you're asking is simply merging r,g,b channels together the answer is in the next section Let me explain Simply take an image containing an rainbow, it is very easy to a human to identify to say "it a rainbow and i. Finally, we will call thewaitKey() method, which will wait for a keyboard event. Asking for help, clarification, or responding to other answers. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The principles would be similar. i've seen several references on the web indicating that the above is possible, but not in my hands. Python Programming Foundation -Self Paced Course, Data Structures & Algorithms- Self Paced Course, Python | OpenCV BGR color palette with trackbars, Detect the RGB color from a webcam using Python - OpenCV, OpenCV - Facial Landmarks and Face Detection using dlib and OpenCV. So we specially import that. Here's the syntax: imshow (window_name, image) This function also takes two arguments: The first argument is the window name that will be displayed on the window. Since we want to convert the original RGB image from the. OpenCV uses BGR image format. #include < opencv2/imgcodecs.hpp >. Oh, and the last channel full of zeros -- looks like transparency. Thanks for contributing an answer to Stack Overflow! Answer (1 of 4): If you're asking for a simple method the answer is no. Did neanderthals need vitamin C from the diet? :). How to use a VPN to access a Russian website that is banned in the EU? Krunal Lathiya is an Information Technology Engineer. In RGB space, pixel values are between 0 and 255. How is the merkle root verified if the mempools may be different? That's what I ended up doing. You can see that we have defined a function called the convertImageToGray() method. The hard way (method you were trying to implement): backtorgb = cv2.cvtColor (gray,cv2.COLOR_GRAY2RGB) is the correct syntax. A median blur is applied when the preprocess flag is set to blur. My image is on the right side of the following output. puzzled. enum cv::ImwritePNGFlags. As a second input, it gets the color space conversion code. We have created this tutorial for dynamic image conversion. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Finally, once the user presses the key, we call the destroyAllWindows()function, which will destroy the previously created windows. We will pass the image through the command line using the argparse module, and then it will convert the image into a grayscale. To convert the RGB image to grayscale, follow the steps below. By using our site, you There are three ways in which an image can be read. Since we want to convert the original RGB image from the BGRcolor space togray, we use the codeCOLOR_BGR2GRAY. Does a 120cc engine burn 120cc of fuel a minute? You can also read image files as ndarray with Pillow instead of OpenCV. Connect and share knowledge within a single location that is structured and easy to search. To fix this, you can simply merge the three single channels, We create a color image with dimensions (200,200,3), Next we convert it to grayscale and create another image using cv2.merge() with three gray channels, We now draw a filled contour onto the single channel grayscale image (left) with shape (200,200,1) and the three channel grayscale image with shape (200,200,3) (right). You could draw in the original 'frame' itself instead of using gray image. This effectively transforms a grayscale image of shape (height, width, 1) into (height, width, 3). 1. rgb_image = cv2.cvtColor (binary_image, cv2.COLOR_GRAY2RGB) * 255. Since the new OpenCV docs don't mention Python syntax, in this case you can also use the appropriate reference for 2.4.x.. import skimage.io import cv2 img = skimage.io.imread('sample.png') cv2.imwrite('sample_out_2.png', cv2.cvtColor(img, cv2.COLOR_RGB2BGR)) Penrose diagram of hypothetical astrophysical white hole. cv2.imwrite("test.jpg", image) imwrite = image write . . This kind of filter is useful for correctly OCRing the image using Tesseract. why cv2.imwrite() changes the color of pics? The reason your backtorgb function this throwing that error is because it needs to be in the format: OpenCV use BGR not RGB, so if you fix the ordering it should work, though your image will still be gray. To do so you have to use the cv2.imread () method. Japanese Temple Geometry Problem: Radii of inner circles inside quarter arcs. . rev2022.12.9.43105. Ready to optimize your JavaScript with Rust? In this example, we will write a numpy array as image using cv2.imwrite () function. Is there a way to convert a grayscale image to an RGB image without altering the image? By using our site, you First, we will display the image as it is imported which means in BGR format. In Python and OpenCV, you can read (load) and write (save) image files with cv2.imread () and cv2.imwrite (). Connect and share knowledge within a single location that is structured and easy to search. In general cases, we read image using cv2.imread (), apply some transformations on . We will use the Image object from the PIL module. Syntax: cv2.imwrite (filename, image) Parameters: filename: A string representing the file name. The second argument is the image that you want to display. In this case we're working only with BGR images. Examples of frauds discovered because someone tried to mimic a random sequence. image: The path to the image were sending to the function. My image still appears gray even after the coversion COLOR_GRAY2RGB. How do I delete a file or folder in Python? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, You could draw in the original 'frame' itself instead of using gray image. Making statements based on opinion; back them up with references or personal experience. Yes. Generate an empty ndarray and store each result . So the short answer is no you cannot go back. We can check to see if we should apply thresholding to preprocess the image, else make a check to see if the median blurring should be done to remove noise. There can be a case when you think that your image is a gray-scale one, but in reality, it is a binary image. First, we have to install the opencv-python package. Answer. Example 2: Save Image using cv2 imwrite () - with Random Values. The cv2.imshow() function receives as first input a string with the name to assign to the window and as the second argument the image to show. The above program reads the input image an RGB image, convert it to grayscale image. Applying the median blur can help reduce salt and pepper noise. I did some thresholding on an image and want to label the contours in green, but they aren't showing up in green because my image is in black and white. How to change the image color when the pixels hsv values are in specific ranges? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. I really don't know why. cv2.imwrite("result.jpg", image) Output: Example 2: If grayscale is required, then 0 can be used as flag. MOSFET is getting very hot at high frequency PWM. Imwrite() : It takes an absolute path/relative path (of the desired location where you want to save a modified image) and image matrix as an argument. Disconnect vertical tab connector from PCB. Hi, I'm studying openCV and I have a simple question. The filename must include image format like .jpg, .png, etc.image: It is the image that is to be saved. This will save the image according to the specified format in current working directory. See the below output. This article describes the following contents. print (reload_grayscale. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. To learn more, see our tips on writing great answers. It can process images and videos to identify objects, faces, or even the handwriting of a human. Various color spaces such as RGB, BGR, HSV can be mutually converted using OpenCV function cvtColor (). OpenCV-Python is a library of Python bindings designed to solve computer vision problems. RGB image array BGR . acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Full Stack Development with React & Node JS (Live), Fundamentals of Java Collection Framework, Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Face Detection using Python and OpenCV with webcam, Perspective Transformation Python OpenCV, Top 40 Python Interview Questions & Answers, Adding new column to existing DataFrame in Pandas, How to get column names in Pandas dataframe, Python program to convert a list to string. Note that when saving an image with the OpenCV function cv2.imwrite(), it is necessary to set the color sequence to BGR.. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. For details on Otsus method, see Otsus Binarization in the official OpenCV documentation. Displaying an Image. How to Convert RGB Image to Grayscale in Python. To do it, we have to call the cvtColor() function, which allows us to convert the image from one color space to another. Early in the program I used gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) to convert from RGB to grayscale, but to go back I'm confused, and the function backtorgb = cv2.cvtColor(gray,cv2.CV_GRAY2RGB) is giving: AttributeError: 'module' object has no attribute 'CV_GRAY2RGB'. Now, go to the terminal and type the following command with the image path. OpenCV: Miscellaneous Image Transformations. that actually didn't work. The waitKey() method receives as input the delay, specified in milliseconds. NB: Not providing any flags means cv2.IMREAD_COLOR is used by default -- i.e. How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? So, our final code looks like the following. It can process images and videos to identify objects, faces, or even the handwriting of a human. This will save the image according to the specified format in current working directory. That's true. 1980s short story - disease of self absorption. cv2.imwrite changes color when saving from np.array to JPG. The hard way (method you were trying to implement): Alternatively, cv2.merge() can be used to turn a single channel binary mask layer into a three channel color image by merging the same layer together as the blue, green, and red layers of the new image. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This means that blue and red planes get flipped. By voting up you can indicate which examples are most useful and appropriate. Add the following code inside the app.py file. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The output image saved on the disk. Add a comment. I read a RGB image and I notice that openCV store it as a Mat in BGR oder. After that, we save the grayscale image on the disk. How do I tell if this single climbing rope is still safe for use? One you convert your image to gray-scale you cannot got back. Now before writing the image to the disk, let's read an image file. To show the images, we have to call the imshow()function of thecv2 module. The following are 30 code examples of cv2.imwrite().You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. Until now, at the time of the command, we have passed only one argument called, The if statement inside the function performs a threshold to segment the foreground from the background. So you can enter whatever path you want to convert that image to grayscale using the argparse module in Python. Making statements based on opinion; back them up with references or personal experience. Thanks for contributing an answer to Stack Overflow! How can I remove a key from a Python dictionary? Our command-line arguments are parsed. There can be a case when you think that your image is a gray-scale one, but in reality, it is a binary image. Why do people write #!/usr/bin/env python on the first line of a Python script? In such a case you have an array of 0's and 1's where 1 is white and 0 is black (for example). I wanna know whether the image file is in RGB order or BGR order, if I save the mat as a png file using imwrite. OpenCV supports a wide variety of programming languages like Python, C++, Java, etc. It seems that a channel is abandoned. How many transistors at minimum do you need to build a general-purpose computer? OpenCV-Python is a library of Python bindings designed to solve computer vision problems. cv2.imwrite and pyplot.imshow displaying grey scale images differently. In that case it's RGBA <-> BGRA. For simplicity, we assume that the file exists and everything loads fine, so we will not be making any error or exception checks. openCV: cannot detect small shapes using findContours. Until now, at the time of the command, we have passed only one argument called image. ririgo71 1 2 5. If not, you will receive an almost blank image, because pixels with value 0 are almost the same as the ones with value 1, when the values of pixels varies between <0, 255>. This would mean RGBA in skimage, and BGRA in OpenCV. How do I access environment variables in Python? Obtain closed paths using Tikz random decoration on circles. The function takes args as a parameter. Find centralized, trusted content and collaborate around the technologies you use most. I'm learning image processing using OpenCV for a realtime application. Alternatively, a blurring method may be applied. Appealing a verdict due to the lawyers being incompetent and or failing to follow instructions? Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? Note the image needs to have the correct datatype: Did not work for me. Return Value: It returns true if image is saved successfully. How to convert an rgb image to ycrcb colour space in opencv python, Open CV 3.0.0 video not processing windows winpython 2.7.9. cv2.imwrite() method is used to save an image to any storage device. # converting the colourfull image into grayscale image # using cv2.COLOR_BGR2GRAY argument of # the cvtColor() function of cv2 # in this : . Why do American universities have so many gen-eds? Since the new OpenCV docs don't mention Python syntax, in this case you can also use the appropriate reference for 2.4.x. Please Login to comment. You can check your current project folder and look for an image name like 4999.png or any four digits number.png image. From your screenshot, it appears that you have a 4 channel image. So, when we read an image using cv2.imread() it interprets in BGR format by default. Saving an image with cv2.imwrite() Saving an image is quite easy and simple. Now to convert BGR to RGB implementation is given below. Then import the argparse module. Execute the line of code given below. How does one convert a Grayscale image to RGB channels in OpenCV? 6 votes. . Where does the idea of selling dragon parts come from? And then, import the cv2 module and os module. To convert RGB image to Grayscale in Python, use the cv2.imread(args[image]) and cv2.cvtColor(image, cv2.COLOR_BGR2GRAY) methods. Nonetheless, you should handle these types of exceptions for robust code implementation. 2 People found this is helpful. image is always loaded as a 3-channel image (dropping any potential alpha channels). imwrite () BGR RGB RGB image array BGR image array . So, when we read an image using cv2.imread () it interprets in BGR format by default. How do I concatenate two lists in Python? Now, we will pass another argument, called preprocess,whose value is one of the following two. You will get a 3 slot array with this but the RGB values will be same as the value it had in the grayscale image. In such a case you have an array of 0's and 1's where 1 is white and 0 is black (for example). We have the following command-line arguments: So, when we run the command python3 app.py, we pass the argument path to the image like the following. The left image showcases the problem you're experiencing since you're trying to display three channels on a single channel image. Thanks for the suggestion. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. By default, cv2.imwrite () assumes the value of cv2.IMWRITE_JPEG_QUALITY as 95. In this article, we will convert a BGR image to RGB with python and OpenCV. Converting a BGR image to RGB and vice versa can have several reasons, one of them being that several image processing libraries have different pixel orderings. Example #4. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, cv2.read or Image from PIL changes PNG image color, Unable to resize image using OpenCV after converting pdf to images using pdf2image package. At what point in the prequels is it revealed that Palpatine is Darth Sidious? We do this using both the cv2.THRESH_BINARY and cv2.THRESH_OTSU flags. See the following article for information on reading videos instead of still . We will either threshold or blur the image depending on the preprocessing method specified by our command-line argument. Learn how your comment data is processed. Advertisement. 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Penrose diagram of hypothetical astrophysical white hole. acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Full Stack Development with React & Node JS (Live), Fundamentals of Java Collection Framework, Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Face Detection using Python and OpenCV with webcam, Perspective Transformation Python OpenCV, Top 40 Python Interview Questions & Answers, Adding new column to existing DataFrame in Pandas, How to get column names in Pandas dataframe, Python program to convert a list to string, Reading and Writing to text files in Python. Not the answer you're looking for? rev2022.12.9.43105. . Does integrating PDOS give total charge of a system? In OpenCV, you display an image using the imshow () function. Here we are going to learn to save an image to a disk. See the following code. Here, the data.jpg image is passed to the convertImageToGray() method. Is this because it's a grayscale image? Therefore it is necessary to multiply by 255 your converted image. Save. Not the answer you're looking for? Ready to optimize your JavaScript with Rust? Jan 21 at 9:39. These flags will be modify the way of PNG image compression and will be passed to the underlying zlib processing stage. cv2.imwrite () method is used to save an image to any storage device. 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