[filmscanners] RE: JPEG Lossless mirror?

["Mark Otway" <mark@otway.com>]

>> FWIW the following is from 
>> http://www.jpg.com/products/wizard.html   It
>> implies that normally you would introduce artifacts when 
>> doing a mirror and re-saving, but I think is claiming that 
>> with this technology you won't degrade the image at all.

Yes, this is what the jpegtran command-line utility does too, which I
posted about all those moons ago (Friday). :-)

JpegTran can also do lossless cropping and rotation too, although I've
not tried it yet.

>> My guess is that it does have to clip to nearest 8 x 8 pixel 
>> block to do this because the boundaries of these blocks 
>> would have to change following a mirror, but this could be wrong.

There is an option with all utilities which do this to tidy up the
'ragged' pixels that remain as a result of the lossless transformation.

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