jpg troubble using "-compose screen"

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anthony
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Re: jpg troubble using "-compose screen"

Post by anthony »

JPEG is a lossy image file format. It does NOT store the colors exactly, especially near sharp color changes such as your transition from dark green to black.

That is the source of your color distortions.

See IM Examples, Common File Formats, JPEG, Jpeg Compression
http://www.imagemagick.org/Usage/formats/#jpg

which looks at this problem in more detail.
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
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