convert rgba to rgb python opencv

Easiest way to convert int to string in C++. COLOR_RGBA2YUV_I420Python: cv.COLOR_RGBA2YUV_I420 | How to convert a NumPy array to PIL image applying matplotlib colormap. 14RGBA RGBARedGreenBlueAlpha RGBRGBRGBalpha Sign in We also share information about your use of our site with our social media, advertising and analytics partners. The hard way (method you were trying to implement): 2. Code for my answer given . This article describes the following contents. When converted to RGB and saved with OpenCV imwrite(), it will be an incorrect color image. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? On output \(0 \leq L \leq 1\), \(0 \leq S \leq 1\), \(0 \leq H \leq 360\) . Note that when converting integer Luv images to RGB the intermediate X, Y and Z values are truncated to \( [0, 2] \) range to fit white point limitations. Now read the LAB image from the location. Answer. ', referring to the nuclear power plant in Ignalina, mean? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Can you still use Commanders Strike if the only attack available to forego is an attack against an ally? Note Function textual ID is "org.opencv.imgproc.colorconvert.bgr2rgb" Parameters src input image: 8-bit unsigned 3-channel image CV_8UC3. You need to add addon ofxOpenCv (use projectGenerator to import project and add addon) and add in file #include ofxOpenCv.h in the header file from class you going to use it. OpenCV imread, imwrite and imshow indeed all work with the BGR order, so there is no need to change the order when you read an image with cv2.imread and then want to show it with cv2.imshow. \[Y \leftarrow 0.299 \cdot R + 0.587 \cdot G + 0.114 \cdot B\], \[Cr \leftarrow (R-Y) \cdot 0.713 + delta\], \[Cb \leftarrow (B-Y) \cdot 0.564 + delta\], \[R \leftarrow Y + 1.403 \cdot (Cr - delta)\], \[G \leftarrow Y - 0.714 \cdot (Cr - delta) - 0.344 \cdot (Cb - delta)\], \[B \leftarrow Y + 1.773 \cdot (Cb - delta)\], \[delta = \left \{ \begin{array}{l l} 128 & \mbox{for 8-bit images} \\ 32768 & \mbox{for 16-bit images} \\ 0.5 & \mbox{for floating-point images} \end{array} \right .\]. This array is easy to do I/O with library imageio using imread and imsave. Here is some java code (works on Android API 24): Python function in accordance with hkurabko's answer. Already on GitHub? \[S \leftarrow \fork{\frac{V-min(R,G,B)}{V}}{if \(V \neq 0\)}{0}{otherwise}\], \[H \leftarrow \forkfour{{60(G - B)}/{(V-min(R,G,B))}}{if \(V=R\)} {{120+60(B - R)}/{(V-min(R,G,B))}}{if \(V=G\)} {{240+60(R - G)}/{(V-min(R,G,B))}}{if \(V=B\)} {0}{if \(R=G=B\)}\]. What is this brick with a round back and a stud on the side used for? 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. The conventional ranges for B, G, and R channel values are 0 to 255. Transformations within RGB space like adding/removing the alpha channel, reversing the channel order, conversion to/from 16-bit RGB color (R5:G6:B5 or R5:G5:B5), as well as conversion to/from grayscale using: \[\text{RGB[A] to Gray:} \quad Y \leftarrow 0.299 \cdot R + 0.587 \cdot G + 0.114 \cdot B\], \[\text{Gray to RGB[A]:} \quad R \leftarrow Y, G \leftarrow Y, B \leftarrow Y, A \leftarrow \max (ChannelRange)\]. See also RGB2BGR The consent submitted will only be used for data processing originating from this website. The parameter code when converting from RGB to BGR is cv2.COLOR_RGB2BGR. These are components from the second row, second and third columns, respectively. Required fields are marked *. to your account. Add color conversion for RGB / RGBA / BGR / BGRA to NV12 / NV21. I agree, use this version, not @Andras Zoltan's. COLOR_BGRA2YUV_IYUVPython: cv.COLOR_BGRA2YUV_IYUV | Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, How a top-ranked engineering school reimagined CS curriculum (Ep. Which was the first Sci-Fi story to predict obnoxious "robo calls"? This function is used to convert an image from one color space to another. OpenCV is a huge open-source library for computer vision, machine learning, and image processing. For a test scenario, convert rgba(0,0,0,.7) on background rgb(255,255,255) using both formulas; hkurabko's forumala clearly produces the correct answer. You probably want to use an image's convert method: In case of numpy array, I use this solution: in which the argument rgba is a numpy array of type uint8 with 4 channels. Dec 1, 2016. rev2023.5.1.43404. If the RGBA is in pre-multiplied color-space and is semi-transparent, you need to divide out alpha to get the correct RGB color. cvtColor generates single channel image that contains full size Y plain and quater size UV interleaved for nv21. So, when we read an image using cv2.imread () it interprets in BGR format by default. So, when we read an image using cv2.imread() it interprets in BGR format by default. \[\vecthree{X}{Y}{Z} \leftarrow \vecthreethree{0.412453}{0.357580}{0.180423}{0.212671}{0.715160}{0.072169}{0.019334}{0.119193}{0.950227} \cdot \vecthree{R}{G}{B}\], \[X \leftarrow X/X_n, \text{where} X_n = 0.950456\], \[Z \leftarrow Z/Z_n, \text{where} Z_n = 1.088754\], \[L \leftarrow \fork{116*Y^{1/3}-16}{for \(Y>0.008856\)}{903.3*Y}{for \(Y \le 0.008856\)}\], \[f(t)= \fork{t^{1/3}}{for \(t>0.008856\)}{7.787 t+16/116}{for \(t\leq 0.008856\)}\], \[delta = \fork{128}{for 8-bit images}{0}{for floating-point images}\]. I've therefore updated the formula below to be correct for the normal case. The mode of the .png image is initially P.However, after calling Image.convert() with RGB as an argument, the mode of the stored in the rgb_im variable image is RGB. This answer works with the CSS's definition of alpha. Asking for help, clarification, or responding to other answers. How to set the text color of TextView in code? When code is cv2.COLOR_BGR2RGB, BGR is converted to RGB. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. On output \(0 \leq V \leq 1\), \(0 \leq S \leq 1\), \(0 \leq H \leq 360\) . If \(H<0\) then \(H \leftarrow H+360\) . Andras defines 0 alpha as opaque and 255 as transparent, while CSS defines it the opposite way. In OpenCV, to convert an RGB image to HSV image, we use the cv2.cvtColor () function. im_pillow = np.array(Image.open('data/src/lena.jpg')) im_bgr = cv2.cvtColor(im_pillow, cv2.COLOR_RGB2BGR) cv2.imwrite('data/dst/lena_bgr_cv_2.jpg', im_bgr) I need to convert these RGB images to YUYV images. Consider only bgr as a source, there are 3 available conversions in cvtColor: where cv::COLOR_BGR2YUV_IYUV=COLOR_BGR2YUV_I420 so that BGR2YUV_I420 and BGR2YUV_YV12 are the only two conversions from BGR to YUV. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. DiagonalGAN Content-Style Disentanglement in StyleGAN Explained! Is it safe to publish research papers in cooperation with Russian academics? Output:Lab ImageRGB Imageif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'aihints_com-box-4','ezslot_3',114,'0','0'])};__ez_fad_position('div-gpt-ad-aihints_com-box-4-0'); Your email address will not be published. Color images are represented as multi-dimensional arrays - a collection of three two-dimensional arrays, one each for red, green, and blue channels. For grayscale images, the result is a two-dimensional array . We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. So you can achieve the goal with existing cvtColor. Therefore, if you want to use both the Pillow function and the OpenCV function, you need to convert BGR and RGB. It may lead to incorrect representation of colors with odd XYZ values. While it is possible to convert images from YUYV (also known as YUV422) into RGB via COLOR_YUV2RGB_YUYV, there is no reverse . image_gray = image.convert ('LA') The gray scale image has two dimension i.e., two matrix (row x col x 2). Now I need to binarize it with threshold and plot a histogram. When converted to RGB, it will be saved as a correct image even if it is saved after being converted to a PIL.Image object. I wrote following code can do such a task: You signed in with another tab or window. Can we find out the difference between 2 RGb colors to find out a 3rd color? -- | -- COLOR_RGB2YUV_I420Python: cv.COLOR_RGB2YUV_I420 | RGB to YUV 4:2:0 family. It opens the images in RGB format by default, removing your shuffling overhead, but if you want to convert BGR to RGB you can use this: In this article, we will convert a BGR image to RGB with python and OpenCV. Why did DOS-based Windows require HIMEM.SYS to boot? By definition, however, this won't work in most cases. Programmatically Lighten or Darken a hex color (or rgb, and blend colors), Counting and finding real solutions of an equation. We can use cvtColor () method to convert a BGR image to RGB and vice-versa. It returns an RGBA tuple of four floats from 0-1. c: It is a matplotlib color or a np.ma.masked color. But with the given algorithm, it would be fully transparent black. On the other hand, in Pillow, the order of colors is assumed to be RGB (red, green, blue). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. COLOR_RGB2YUV_YV12Python: cv.COLOR_RGB2YUV_YV12 | Well occasionally send you account related emails. You have to cvCreateImageHeader instead of cvCreateImage unsigned char* buffer; int width = 100; int height = 100; IplImage* img1 = cvCreateImageHeader(cvSize(width,height),IPL_DEPTH_8U,4); cvSetData(img1,buffer,img1->widthStep); Comments Can you tell me why? This is unusual considering that RGBA(0,0,0,1) is fully opaque black. I know the theory but could not find the which function in python can convert gray scale image to binary and then make its . Save my name, email, and website in this browser for the next time I comment. For example, the above pattern has a very popular "BG" type. I'm gaining upvotes for this answer regularly, and it's possible that some people are finding it, having to invert the algorithm themselves. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The above formulae for converting RGB to/from various color spaces have been taken from multiple sources on the web, primarily from the Charles Poynton site http://www.poynton.com/ColorFAQ.html. By clicking Sign up for GitHub, you agree to our terms of service and You can use the OpenCV function cvtColor() or simply change the order of ndarray. COLOR_BGR2YUV_YV12Python: cv.COLOR_BGR2YUV_YV12 | When a gnoll vampire assumes its hyena form, do its HP change? COLOR_BGRA2YUV_YV12Python: cv.COLOR_BGRA2YUV_YV12. This outputs \(0 \leq L \leq 100\), \(-127 \leq a \leq 127\), \(-127 \leq b \leq 127\) . Thanks. In case of a transformation to-from RGB color space, the order of the channels should be specified explicitly (RGB or BGR). Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Coordinates in all of these color spaces are floating point values. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The conversion from a RGB image to gray is done with: More advanced channel reordering can also be done with cv::mixChannels. Connect and share knowledge within a single location that is structured and easy to search. We'll call the result, Normalise also the matte colour (black, white whatever). Full Stack Development with React & Node JS(Live) Java Backend Development(Live) Android App Development with . The function converts an input image from one color space to another. https://docs.opencv.org/4.x/d8/d01/group__imgproc__color__conversions.html#ga4e0972be5de079fed4e3a10e24ef5ef0. Here is a convenient SASS function in accordance with Andras' and hkurabko's answers. . Why typically people don't use biases in attention mechanism? ): To get the final 0-255 values for Target you simply multiply all the normalised values back up by 255, making sure you cap at 255 if any of the combined values exceed 1.0 (this is over-exposure and there are more complex algorithms dealing with this that involve whole-image processing etc.). How to force Unity Editor/TestRunner to run at full speed when in background? You need to just follow these steps: If OpenCV is not installed, then first install it using this code. You may use cv2.merge () to add the alpha channel to the given RGB image, but first you need to split the RGB image to R, G and B channels, as per the documentation: Python: cv2.merge (mv [, dst]) mv - input array or vector of matrices to be merged; all the matrices in mv must have the same size and the same depth. OpenCV provides the cvtColor function that allows to convert an image from one color space to another. If anyone is still interested, this JSBin allows to watch the color being transformed. I think this answer assumes that the background color is rgb, not rgba. tar command with and without --absolute-names option, Ubuntu won't accept my choice of password. Why is it shorter than a normal address? (xb_bgr) imshow(xb_rgb) ##### # Convert RGB to grayscale # NOTE: image comes in torch.uint8, and kornia assumes floating point . Generic Doubly-Linked-Lists C implementation. Best way to convert string to bytes in Python 3? Ironically, having just tried to use my solution to do this, I agree that my original answer, although it made its own kind of sense, didn't really work for most applications. cvtColor(src, bwsrc, cv::COLOR_RGB2GRAY); 8-bit images: \(V \leftarrow 255 V, S \leftarrow 255 S, H \leftarrow H/2 \text{(to fit to 0 to 255)}\), 16-bit images: (currently not supported) \(V <- 65535 V, S <- 65535 S, H <- H\), 32-bit images: H, S, and V are left as is, 8-bit images: \(V \leftarrow 255 \cdot V, S \leftarrow 255 \cdot S, H \leftarrow H/2 \; \text{(to fit to 0 to 255)}\), 16-bit images: (currently not supported) \(V <- 65535 \cdot V, S <- 65535 \cdot S, H <- H\), 8-bit images: \(L \leftarrow L*255/100, \; a \leftarrow a + 128, \; b \leftarrow b + 128\), 32-bit images: L, a, and b are left as is, 8-bit images: \(L \leftarrow 255/100 L, \; u \leftarrow 255/354 (u + 134), \; v \leftarrow 255/262 (v + 140)\), 32-bit images: L, u, and v are left as is. The function converts an input image from BGR color space to RGB. In my case, I wanted to convert an RGBA image to RGB and the following worked just as expected: This depends on the color space you use. First, we will display the image as it is imported which means in BGR format. privacy statement. When the image file is read with the OpenCV function imread(), the order of colors is BGR (blue, green, red). BGR2GRAY code is used to convert RGB image to grayscale image. By using our site, you You might want to read the famous paper "Compositing digital images" (by Porter and Duff) for full details on alpha-composition: The answer of Andras Zoltan and hkurabko are also useful to calculate the oposite, I mean if you have various alpha blended colors and have its original backgrounds (mattes) then you could calculate the original RGBA color which is what I've been looking for a while ;), In the light of the question edit this is a very accurate and good answer. I deleted mine and hope you bubble up, since you explained the matters way better :). Have a question about this project? COLOR_RGBA2YUV_IYUVPython: cv.COLOR_RGBA2YUV_IYUV | look at the ofxCv examples how the convert ofImages and ofPixels to cv::Mat so that openCv can use them. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. See cv::cvtColor and cv::ColorConversionCodes. You probably want to use an image's convert method: import PIL.Image rgba_image = PIL.Image.open (path_to_image) rgb_image = rgba_image.convert ('RGB') Share Improve this answer Follow edited Oct 7 '19 at 6:30. Developer & AI Researcher. However, in following demostration, NV21 and NV12 has interleaved V/U plane, but I420 and YV12 don't. Where can I find a clear diagram of the SPECK algorithm? something like toCv(myOfImage), Powered by Discourse, best viewed with JavaScript enabled, Screen Shot 2017-09-07 at 11.54.17 AM.png. You can also use an if statement to check if the mode of the image is RGBA before calling the Image.convert() method. Counting and finding real solutions of an equation. (For details, please see the difference in the color format of cv2 and PIL). A more specific answer, however, incorporates the alpha value into the actual colour result based on an opaque background colour (or 'matte' as it's referred to). Parabolic, suborbital and ballistic trajectories all follow elliptic paths. alpha: It is an optional parameter that accepts a scalar. Through the adjustments of the contrast values of the image, the intensity . In my case I wanted to make the RGB image look as if it was an RGBA image on a white background. We can use cvtColor() method to convert a BGR image to RGB and vice-versa. Pre-processing merge. Sorry for the trouble. Hi! How to convert a RGBA color like rgba(0, 0, 0, 0.86) to a RGB hex value that takes the alpha component into account? In the YIQ space, the Y coordinate is between 0 and 1, but the . white background? A Library Matplotlib.colors.Normalize class in Python, Matplotlib.colors.LogNorm class in Python, Matplotlib.colors.ListedColormap class in Python, Matplotlib.colors.LinearSegmentedColormap class in Python, Matplotlib.colors.Colormap class in Python, Matplotlib.colors.DivergingNorm class in Python, Matplotlib.colors.BoundaryNorm class in Python, Matplotlib.colors.PowerNorm class in Python, Matplotlib.colors.SymLogNorm class in Python, Natural Language Processing (NLP) Tutorial. . Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Convert RGBA to RGB taking background into consideration, Algorithm for Additive Color Mixing for RGB Values, Matplotlib Plots Lose Transparency When Saving as .ps/.eps. First, while the coefficients are correct for sRGB or Rec709, to convert from color to Y. Refer to the following document for the value to be specified for the parameter code. If the color is in non pre-multiplied color-space, then you can just discard the alpha channel. Im using opencv actually but is no recognizing the code: Did you try ofPixels methods? If total energies differ across different software, how do I decide which software to use? How to apply a texture to a bezier curve? Therefore, if the ndarray of the image read by OpenCV imread() is converted to a PIL.Image object and saved, the image with the wrong color is saved. I highly recommend you get the Computer Vision: Models, Learning, and Inference Bookto learnComputer Vision. What does 'They're at four. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Converting BGR and RGB can be realized without using cvtColor(). Popular Python code snippets. Use this when reading an image file as a PIL.Image, convert it to ndarray, and save it using OpenCV imwrite (). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Can I use my Coinbase address to receive bitcoin? RGBA to RGB conversion. OpenCV => 4.0.0; Operating System / Platform => Manjaro Linux 64 Bit; Compiler => Python 3.7.1; Detailed description. You can always read the image file as grayscale right from the beginning using imread from OpenCV: img = cv2.imread('messi5.jpg', 0) Furthermore, in case you want to read the image as RGB, do some processing and then convert to Gray Scale you could use cvtcolor from OpenCV: gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY) PandasOpenCVSeabornNumPyMatplotlibPillow PythonPlotly Python. Each one has one value per pixel and their ranges are identical. Find centralized, trusted content and collaborate around the technologies you use most. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. 15 Python code examples are found related to "convert rgb to rgba". +1 - and I have updated my answer to work with alpha being the 'right way round', as per this as well. COLOR_BGRA2YUV_I420Python: cv.COLOR_BGRA2YUV_I420 | Typescript function in accordance with hkurabko's answer. +1 This works with the most common definition of alpha (0 = transparent) like OpenGL, SDL, graphics editors. Did the drapes in old theatres actually say "ASBESTOS" on them? While BGR is used consistently throughout OpenCV, most other image processing libraries use the RGB ordering. This method simply removes the alpha channel from the RGBA images, the transparency will turn into black (or sometimes noises) in the resulting images. There are several modifications of the above pattern that can be achieved by shifting the pattern one pixel left and/or one pixel up. We and our partners use cookies to Store and/or access information on a device. What is the simplest and fastest way to convert an RGBA image in RGB using PIL? It's not them. What is the best way to remove accents (normalize) in a Python unicode string? You probably want to use an image's convert method: import PIL.Image rgba_image = PIL.Image.open (path_to_image) rgb_image = rgba_image.convert ('RGB') Share Improve this answer Follow edited Oct 7, 2019 at 6:30 ejuhjav 2,620 2 24 31 answered May 14, 2018 at 14:06 Noctis Skytower 21.2k 16 82 116 Add a comment 15 By using our site, you https://docs.opencv.org/4.x/d8/d01/group__imgproc__color__conversions.html#ga8e873314e72a1a6c0252375538fbf753, https://docs.opencv.org/4.x/d8/d01/group__imgproc__color__conversions.html#gga4e0972be5de079fed4e3a10e24ef5ef0a86027a131a58ef888873fafd4eb603d0, https://gist.github.com/Jim-Bar/3cbba684a71d1a9d468a6711a6eddbeb#file-yuv_formats-png, no COLOR_BGR2YUV_NV12! 1. backtorgb = cv2.cvtColor(gray,cv2.COLOR_GRAY2RGB) 2. This function accepts color conversion code. You are right. jsbin.com/qocixeh/edit?html,js,console,output, gist.github.com/vladimirbrasil/bd139851ff757a1c8cb46fac93e733eb, How a top-ranked engineering school reimagined CS curriculum (Ep. Is there a generic term for these trajectories? Find centralized, trusted content and collaborate around the technologies you use most. In this article, we will convert a BGR image to RGB with python and OpenCV. OpenCV uses BGR image format. Not the answer you're looking for? If you want to convert ndarray and PIL.Image objects to use both Pillow and OpenCV functions, you need to convert BGR and RGB. Consider a color image, given by its red, green, blue components R, G, B. * A few comments have been raised that my original answer was not correct. C++ Programming - Beginner to Advanced; Java Programming - Beginner to Advanced; C Programming - Beginner to Advanced; Web Development. I can't find a simple method to do this, I don't need to take background into consideration. 6 comments Contributor danopdev commented on Sep 14, 2022 OpenCV => 4.x Do you just want to remove the alpha channel? 100 Python . I don't know how I missed them. It returns an RGBA tuple of four floats from 0-1. Python image = cv2.imread("C:\\AiHints\\lab_image.jpg") Manage Settings how to time a function in python; reverse words in a string python without using function; string reverse function in python; fizzbuzz program in python using function; palindrome program in python without using string functions COLOR_BGR2YUV_IYUVPython: cv.COLOR_BGR2YUV_IYUV | ()vpopenCVnumber . How to combine existing cvtColor to achive the conversion from BGR to NV21? It'd be better if it was more complete. This outputs \(0 \leq L \leq 100\), \(-134 \leq u \leq 220\), \(-140 \leq v \leq 122\) . COLOR_RGB2YUV_I420Python: cv.COLOR_RGB2YUV_I420 | RGB to YUV 4:2:0 family. In case of 8-bit and 16-bit images, R, G, and B are converted to the floating-point format and scaled to fit the 0 to 1 range. In this tutorial, I will show you how to convert RGBA images to RGB images in the simplest ways using OpenCV (cv2) and Pillow (PIL). You dont need opencv for that operation only. There is an algorithm for this (from this wikipedia link): Now, the conversion is defined as (in complete psuedo code here! Reading Graduated Cylinders for a non-transparent liquid, Normalise the RGBA values so that they're all between 0 and 1 - just divide each value by 255 to do this. Wikipedia and Andras Zoltan's answer is a little bit different. COLOR_RGB2YUV_IYUVPython: cv.COLOR_RGB2YUV_IYUV | OpenCV uses BGR image format. version rgba(0,0,0,0) with matte rgb(ff,ff,ff) will be changed to rgb(0,0,0). This method simply removes the alpha channel from the RGBA images, the transparency will turn into black (or sometimes noises) in the resulting images. COLOR_RGBA2YUV_YV12Python: cv.COLOR_RGBA2YUV_YV12 | We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The matplotlib.colors.to_rgba() function is used convert c(color) to an RGBA color. Has the cause of a rocket failure ever been mis-identified, such that another launch failed due to the same problem? The matplotlib.colors.to_rgba () function is used convert c (color) to an RGBA color.

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