The customer reports: When we compared "GS" output with "Photoshop" output then there was smoothness problem. Here I have attached the output file "GS.png" which is genereted using "GS" and "Photoshop.png" which is generated using "Photoshop" respectively. I've verified that this occurs with head (r10959). The command line the customer and I are using for testing: bin/gs -sDEVICE=ppmraw -sOutputFile=test.ppm \ -dNOPAUSE -dBATCH -dTextAlphaBits=1 \ -dGraphicsAlphaBits=1 -dDOINTERPOLATE \ -dUseCIEColor -sDEVICE=pngalpha \ ./bkrd_fade2_fv2.eps
Created attachment 6118 [details] Photoshop.png
Created attachment 6119 [details] GS.png
Created attachment 6122 [details] AR9_bkrd_fade2_fv2.png Interestingly, when I convert the EPS file to PNG using Adobe Acrobat 9, I see an even less smooth image than with Ghostscript (attached).
Ah, as far as I can tell the EPS file doesn't contain a 'gradient', it contains an image. The image is as smooth as Photoshop makes it. Setting /Interpolate true might make a difference if the image is scaled, and maybe -dGraphicsAlphaBits ? But the fact that Acrobat shows much the same image indicates to me that the lack of smoothness is in the supplied image data.
We need to make sure that -dDOINTERPOLATE is working in this case, and if it is, then let Marcos know (and assign to him) to let the customer know that we do better than Acrobat which is all we can do.
Comment on attachment 6118 [details] Photoshop.png wrong mime type
Created attachment 6435 [details] Comparison GS, AR and Photoshop A comparison of taking the source file directly into photoshop and rescaling in photoshop to 72dpi (labeled as photoshop), saving a tiff at 72dpi from AR 9.0 (labeled Acrobat) and GS output with -dDOINTERPOLATE (No -dUseCIEColor used since the ICC CM is now used) at 72 dpi. Note that the AR output is terrible. GS matches the photoshop result quite well.
Based upon the above comparison, I am not seeing an issue here. Closing for support to handle from here.
Changing customer bugs that have been resolved more than a year ago to closed.