I'm not sure if this is a bug from your point of view, but here's the report.. If I view a pdf with, say, evince the pdf loads then a few seconds later the quality of the pdf improves, particularly the text and some of the images. It's like evince is doing some kind of optimisation for displaying the pdf. With ghostscript, when I convert a pdf to an image, I get the same image as evince first gets, but not the optimised version, i.e. not with the clearer text and better quality images.
Please attach a PDF that exhibits the described behavior. When I compare Ghostscript to Adobe Acrobat 7, the screen view is the same. Note that Acrobat defaults to 'smooth text', so you have to use -dTextAlphaBits=4 to see the same quality from Ghostscript (we default to non-antialiased since it is slightly quicker). Perhaps 'evince' is displaying non-antialiased, then it repaints with anti-alias. Without a sample file we can't do anything more on this issue.
Okay. I'll upload one on Monday.
Created attachment 3905 [details] pdf with problem
Note also title "Office World" is/seems to be gone. I am using: gs -dPARANOIDSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=0 "-sDEVICE=png16m" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r96x96" -dUseCIEColor "-sOutputFile=OUT.png" 29-03-OE-2M1-OE_292M1036-01-4C.pdf
I see the title with Ghostscript (rev 8609), but there is one substantial difference compared to Acrobat and one minor difference. Alone the bottom edge there with Ghostscript there is a blue bar. With Adobe Acrobat 7 the bottom is white and the word "WERBUNG" in the lower left. This is painted over by Ghostscript in a BX EX block in steps 9287 through 9301 (PDFSTEP values). The minor difference is the white border painted around the image "I6" is wider with Acrobat than with Ghostscript. This is painted by the "S" operator in step 15621. I've attached screen shots that I get with each. My gs command line is: gs -dDOINTERPOLATE -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -dUseCIEColor -r82 bug_689773.pdf (I chose r82 to match what I see on a full page view with Acrobat).
Created attachment 3906 [details] AR7.png
Created attachment 3907 [details] gs_r8609.png
Thanks for marking the attachments as private, but unfortunately bugzilla doesn't let me see them! No matter though, I see what you are saying. Using your command I also see no "office world" at the top, the background for the page is blue instead of white, a missing background image on the page, and a lower quality photo. Will attach screenshot.
Created attachment 3915 [details] comparison (evince vs. gs)
I am using gs 8.62 with this patch: http://ghostscript.com/pipermail/gs-cvs/2008-March/008183.html
I did confirm that Ghostscript 8.60 displays this the same as Adobe (and evince). I get different results with rev 8609 than was posted by the submitter as the 'comparison' image, but 8609 is still "wrong" (but closer to correct). Initial assignment to Alex is reasonable, but this may not be in the PDF interp. If not he will reassign. Raising the priority since this is a regression from 8.60.
Is it worth changing status?
All problems, mentioned in the bug report appear to be fixed in the current development code (rev. 9239).