| From: | Neil Bothwick |
| Date: | 2 Mar 2001 at 09:04:54 |
| Subject: | Re: Lossless JPEG manipulation |
clubbed said,
> I'm looking for a utility which allows simple manipulation of JPEG
> images, particularly rotation, without decompressing and recompressing
> and thus losing image quality. I've done a fair bit of web searching and
> posted on c.s.a.graphics with no joy.
I had a look for one of these a while ago, with no luck. There are PC
programs that do this, the software supplied with digital cameras
usually has such a feature.
I believe it's a fairly simple operation to change the orientation of a
JPEG without decompressing it, a matter of changing some indexing
information. I'm surprised no one has ported this to the Amiga.
> I've read that jpegtran which is part of the Independent JPEG Group's
> suite of utilities should be able to do this but the port on Aminet
> (gfx/conv/jpegV6bin.lha) is version 6a which doesn't seem to support
> image rotation. Does anyone know of a port of the more recent 6b
> release (the source is available from the IJG's website at
> http://www.ijg.org) or of any other utilities which will do the same
> job (command line preferred as I want to use this from an AREXX script)?
You cold try asking in csa.programming, someone there is bound to rise
to the challenge. Or you could ask in csa.misc to see if the VIC will
have this capability :)
Neil
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