We can do this using the Image.open() function, which takes the filename of the image as an argument. The first step is to load the background image and the transparent PNG image into PIL. Let’s now see how to merge a transparent PNG image with another image using PIL stepwise in detail: Step 1: Load the images into PIL Save the merged image to a file using the save() function Paste the foreground image onto the new image using the paste() function, but with a mask that indicates which pixels should be transparent Paste the background image onto the new image using the paste() function Load the two images into PIL using the Image.open() functionĬreate a new image with the same size as the background image In order to merge a transparent PNG image with another image using PIL, we will need to perform the following steps: The library is compatible with a wide range of image formats, including JPEG, PNG, BMP, GIF, and TIFF. It provides a range of functions for opening, manipulating, and saving different types of image files. PIL is a powerful library for working with images in Python. In this article, we will learn how to merge a transparent PNG image with another image using PIL. One common use case is to merge a transparent PNG image with another image to create a composite image that contains both images. Palette export with a transparent color is, to put it bluntly, completely BROKEN for PNG 2.x on PC.įinally, even with no meta-data or ICC data, exported PNGs that are not in palette format are larger than they need to be, with sub-optimal compression of completely transparent areas.In the world of image processing, merging two or more images together is a common operation. Pure black pixels may just vanish altogether, even when the number of different colors in the image is very low. However, I had a white matte and black pixels were vanishing!Į.g. I can understand colors that match the 'matte color' being turned into completely transparent. I can understand that the alpha would be lost in palette images because the palette entries have no alpha but I cannot see any reason why opaque colors would simply vanish. I can see this problem on an image I have that has only 21 unique colors in it. If you export in PNG palette mode, some colors just vanish and are replaced with transparency, regardless of their alpha. and this bug exists in older versions such as 2.04 as well. however it will still export as if you've set transparent - so I guess that is actually ANOTHER bug of a slightly different kind - it's showing a matte color instead of transparent, but still performing the transparent export.Īlso, there is a FURTHER bug for export of images with transparent content. However, when you NEXT go to export, the matte will look like white again. Not only did I find this bug, I have a temporary workaround: if you swap to Swatches for the matte color picker, you can pick a transparent swatch and it will work. My memory may be imperfect because I was so busy just trying to get proper output and couldn't care less about doing testing at the time. It could be the nature of the bug causes a bad "default" state (default=First rendering of the Export Window after the offending update) that loads the boolean for the matte swatch incorrectly and the problem may be how it's stored, maybe not how it is "read" into code, if I were to make a basic guess. I wasn't 100% sure if it was even a bug because I thought perhaps another setting elsewhere was overriding the swatch. It was like the issue was under the hood and I could still produce a PNG with transparency. What you described is what happened on my end on first run of Export panel post-update, but I couldn't reproduce it again. Following the suggestion from selecting the "no matte" option in the Swatch panel fixes this.Ĭlosing Designer and re-opening it can restore the default of "no matte" as well, even though the color thumbnail is incorrect. It's also a bug (2.1.0, Windows 10) in that upon starting Designer and going into the Export window for the first time, the Matte thumbnail is pure white (no red slash through it) even though there is no matte actually selected.
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