On 17/2/03 9:19 am, Andy Johnstone wrote:
> My agencies also ask for un-compressed tiff's because of loss of image
> quality when sending in max compression JPEG's. Are yousaying this is a load
> of tosh and there is no loss of quality when creating a JPEG? If so then
> great as I am currently ploughing through CD's - 12 image per CD - and I am
> submitting 1000's!!
>
> I'd like to be clear on this issue once and for all. aprt from anything esle
> it will save me lots of HD space on my machine too.
>
Andy
I lost count of the times I've posted to lists about this little technique
of comparing JPEGs with TIFFs:
Open a TIFF, flatten it, dupe it, save it as a full quality JPEG and include
the same profile as the TIFF, close the JPEG (I don't think that last step
is necessary but I would do it, just in case) and open it again. Drag it
into the TIFF's window. Set the blend mode to Difference. If all you see is
black, then there's no difference in quality. If you see some stray pixels,
they're the ones that have been affected in the conversion. You can also run
the pointer over the window and watch the Info palette to see which, if any,
pixels have changed values.
If sending or archiving, a RGB/CMYK JPEG weighs hell of a lot less than a
55mb RGB/CMYK TIFF. I defy anyone to tell the difference when the two are
printed by a knowledgeable person. By knowledgeable, I mean ANYONE who has
more knowledge than I do and I have F*** all...seriously!
OTOH, if a 100 or so pixels matter to you out of, say, 12,121,088 then, of
course, save as a TIFF. <G>
--/ Shangara Singh :: Photographer
Adobe Certified Expert ~ Photoshop 7.0
PortfoliosOnCD for Photographers
Exam Aids for Photoshop ~ Illustrator ~ Dreamweaver
http://www.shangarasingh.com
===============================================================
GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
