Which tools drop the color profile? Pillow, ffmpeg and sips across JPG, PNG and WebP

If a photo looks washed out after you compress or convert it, the encoder is usually not the culprit. More often the tool dropped the color profile on save, and the viewer is now reading the same pixel values with a different color standard. I ran one Display P3 image through Pillow, ffmpeg and macOS sips, saved it as JPG, PNG and WebP, and wrote...