Richard writes ...
Back in the days when using such systems as Scitex we always went by the rule that there would be no degradation in a rotated file as long as it was 90 or 180 degrees, or a hortz. or vertical flop because no pixels needed to be rebuilt to the actual image. That always proved itself out then, and I still keep that in mind when using PS intensively on a daily basis. Anyone know if that is still the case?
Yes ... still the case ... however, this thread is addressing the issue of
JPEGs. I.E., image utilities such as Graphic Converter and my ThumbsPlus
can losslessly rotate a JPEG (without opening it), whereas Photoshop needs
to rotate while the image is open and resave it ... and therefore the save
(again as JPEG) operation degrades (however minimally) the image.
cheerios ... shAf :o) Avalon Peninsula, Newfoundland www.micro-investigations.com
Therein lies a point that is well known, that a JPEG saved upon itself will be guaranteed to degrade. Has nothing to do with the rotation which is a completely separate step and function. So, bearing in mind that all rotations will show at least some degradation unless at 90 or 180 degrees, or a hortz. or vertical flop. I always save any JPEG files that have been worked on as tiff or PSD; -not to any lossy format.
Richard Schwab Colour Management Color Target Consulting 57 High Quay/City Road Newcastle upon Tyne NE1 2PD 0191 230 5822 [EMAIL PROTECTED] www.colortarget.com
"Outside of a dog, a book is man's best friend. Inside of a dog, it is really too dark to read."
Groucho Marx
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