Pillow composite

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The Image module of the image processing library Pillow PIL of Python provides composite for compositing two images according to a mask image. Note that composite is a function to composite two images of the same size. Use the paste to composite images of different sizes. There are three parameters for composite. All three must be Image objects, all of the same size.

Pillow composite

If you have two images A and B, you alpha-composite A over B, it will create an effect that you can see both image A and B in the resulting image, as if A has transparency and you can see through A and also see B. Suppose a is the src image, b is the destination image, we composite a over b. The equation for alpha value and pixel value of the generated image are:. So it is easy to see that the resulting pixel value is a linear combination of pixel value from a and b. To test the correctness of the above equations, use the above script. After alpha compositing, the value for channel R and G of im1 should be all 67, for channel B should be all 0, and for alpha channel should be all without rescale, it should be 0. So if we have a large image A and we want to overlay a small image B onto it. How do we do it correctly? We should first add an alpha channel with value for image A. This is the crucial step for correct alpha-compositing. This will not affect the region in A that do not have overlap with image B. Otherwise, you will get a opaque look for those regions. Then we should set proper alpha for image B, depending on how you want to composite. In this case, the pixel value for the resulting image becomes simply:. For example, if you want B to completely dominate the overlapping region, you can set alpha to

Like Article Like. ImageDraw and ImageFilter are used when drawing a figure and creating a mask image.

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The Image module of the image processing library Pillow PIL of Python provides composite for compositing two images according to a mask image. Note that composite is a function to composite two images of the same size. Use the paste to composite images of different sizes. There are three parameters for composite. All three must be Image objects, all of the same size. ImageDraw and ImageFilter are used when drawing a figure and creating a mask image. When reading an image file and using it as a mask image, they may be omitted. This time, the second image is reduced by resize to match the size. If you cut out part of the image and adjust the size, use crop.

Pillow composite

Since PIL is no longer under development, Pillow is now widely used. Although advanced image processing face recognition, optical flow, etc. Because Pillow is simpler and easier to understand than OpenCV, it is better to use it depending on the purpose. See the following link for individual articles that explain various processes such as resizing and trimming. Pillow and PIL cannot coexist. If you have installed both, you should uninstall both and reinstall only one. Note that if you are using Python 3, you may have to use pip3 instead of pip depending on your environment. Read the image file.

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Importing Image module from PIL package. Save Article. See the article below. Otherwise, you will get a opaque look for those regions. Admission Experiences. So it is easy to see that the resulting pixel value is a linear combination of pixel value from a and b. Share your suggestions to enhance the article. Then we should set proper alpha for image B, depending on how you want to composite. LastMod This time, the second image is reduced by resize to match the size. How do we do it correctly? The equation for alpha value and pixel value of the generated image are:. Additional Information. Report issue Report. For RGB images, this is done for per-channel per-pixel.

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Interview Experiences. Explore offer now. Try using a black and white horse-shaped image scikit-image sample: skimage. All three must be Image objects, all of the same size. As an example, create a solid image with a value of with Image. In this case, the pixel value for the resulting image becomes simply:. If you want to show partial A and B, you can set alpha to a value between 0 and Admission Experiences. This is the crucial step for correct alpha-compositing. After alpha compositing, the value for channel R and G of im1 should be all 67, for channel B should be all 0, and for alpha channel should be all without rescale, it should be 0. ImageDraw and ImageFilter are used when drawing a figure and creating a mask image. Must have the same mode and size as the first image.