Shangara wrote: >I did a quick test by saving a PSD file as a JPEG at full quality, closing >it for good measure. Opening it, duping it, running Brian's script on it and >then saving it as a full quality JPEG. Closing again for good measure and >opening it. Shift-dragging it into the original JPEG and comparing. I found ><values had changed by 1-3 levels, even though the file was saved by >Photoshop and at full quality both times. > >If I saved another file in between the two JPEG saves, Photoshop showed the >JPEG Options dialog set to it's settings and not the settings used to save >the PSD as a JPEG, which, if the rumours were true, it should have shown for >you to accept. > >Frankly, a change of 1 or 2 levels here and there among millions of pixels >is not going to be noticed on screen or show in print. You would have to >view the two files, I reckon, at something like 4-800% magnification in >Photoshop to see it, and then only if you toggle the visibility between the >two versions. And I seriously doubt if you could spot the difference by >using a loop on a print - unless you print it on clear acetate, superimpose >the two in pin register and view over a lightbox! <g>
I did the same thing at a Seybold show where we exhibited, without the last Save and Open, and produced Giclee prints of the finished result, and although many people said they could see the difference, they could not. Some people, usually Photoshop experts, even told me I had them labeled incorrectly or stated they had done a similar test and could immediately tell the difference. I have since done the same thing with a JPEG made in another product, and although the differences were small, they were noticeable with a loupe, but not without. If you change the compression settings, it becomes obvious, as you would expect. John PC Graphics Report www.pcgraphicsreport.com =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
