"Fredrik Lundh" <[EMAIL PROTECTED]> writes:
> > You could do it with PIL, or run jpegtran in an external process.
> > jpegtran may be easier.
>
> eh? are you sure you know what jpegtran does?
>
> JPEGTRAN(1)
Whoops, sorry, right, jpegtran is for rotating the images. I meant:
use a pipeline like
djpeg -scale 1/4 | cjpeg
That's how I usually do it. Main disadvantage is the scale factor has
to be 1/2, 1/4, 1/8, etc., not arbitrary amounts like 0.3456.
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