Originally reported by: rayjj@users.sourceforge.net An Artifex customer has requested this enhancement (id #671). When Acrobat Reader displays PDF pages that contain images that are higher resolution than the display, the displayed image is a smoothed or averaged representation. Note that this type of smoothing does NOT conform to the PDF 1.3 2nd edition specification, and Acrobat Reader 4 and 5 seem to use slightly different algorithms for deciding when to apply smoothing and how the smoothing is done. This will not the the default behaviour, but a settable parameter will be implemented to invoke image smoothing with GS. The difference in image handling between Ghostscript and Adobe Acrobat has been noticed (and complained about) by other users in the past. Detailed discussion and proposed specification will take place on the gs-devel and gs-code-review mailing lists on ghostscript.com.
Comment originally by lpd@users.sourceforge.net Logged In: YES user_id=8861 Please explain why this function must be different from the one already provided by the Interpolate flag in image dictionaries.
Created attachment 345 [details] Color Background image shows problem The background image looks really bad, particularly at resolutions near 75. -dDOINTERPOLATE helps a bit, but even at -r74, this looks bad.
*** Bug 687394 has been marked as a duplicate of this bug. ***
*** Bug 688516 has been marked as a duplicate of this bug. ***
Replace with current customer that has seen this effect (REF. 687394)
reassigning to Ray since he recently made some improvements in this area. I didn't check if it was fixed.
Since Robin has done a better image downscaling filter, assigning to him so that he can have the pleasure of closing this really old bug.
The downscaling changes in revision 11786 seem to solve this.