Amos Newcombe wrote:
> > img2.save("xyz1.jpg" + ext, "JPEG", quality=100)
>
> (I haven't checked your other steps. The save() call looks unnecessarily
> complicated, but I don't know what code you've cut out.)
quality=100 is a bad idea, at least. quoting myself from an earlier post:
JPEG quality 100 is overkill, btw -- it completely disables JPEG's
quantization stage, and "mainly of interest for experimental pur-
poses", according to the JPEG library documentation, which
continues:
"Quality values above about 95 are NOT recommended for
normal use; the compressed file size goes up dramatically
for hardly any gain in output image quality."
As for suitable settings, the documentation recommends the following:
"/.../ the quality setting should be between
50 and 95; the default of 75 is often about right. If
you see defects at quality 75, then go up 5 or 10
counts at a time until you are happy with the output
image. (The optimal setting will vary from one image
to another.)
For the full excerpt from that documentation, see:
http://mail.python.org/pipermail/image-sig/2002-July/001916.html
regards /F
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