I am quite happy with IM preserving the JPEG quality by default, i.e.
producing a JPEG output of comparable size as long as the dimensions of
the picture are not altered.
But how exactly does IM identify the JPEG quality when I use the command
identify -verbose test.jpg
? Having tested this with different image sources, I suspect that this
just evaluates a JPEG header field. Depending on the program source of
the image, the same photo can have quite deviating "quality" though the
JPEG files have almost the same size.
Any ideas?
Wolfgang Hugemann
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