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If I understand you correctly, you seem to want to make an image of the white shape, where the black parts are transparent. I don't normally use XnConvert. I just downloaded it, and was able to find this solution: First add a Levels action. Pull the white slider all the way to the left to make the image completely white. Then add a Add mask action. Use the ...


A slightly modified answer, to make it a complete answer. Install ImageMagick via terminal. Resize all the images in the folder you want to change, to a sample size, e.g.: magick mogrify -resize 256x256 * then run mogrify -extent 300x300 -gravity Center -fill white *

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