Bug 702128

Summary:	File renders incorrectly with current master, 9.50 renders correctly
Product:	Ghostscript	Reporter:	Ken Sharp <ken.sharp>
Component:	Regression	Assignee:	Ray Johnston <ray.johnston>
Status:	NOTIFIED FIXED
Severity:	normal	CC:	michael.vrhel
Priority:	P2
Version:	master
Hardware:	PC
OS:	Windows 10
Customer:	650	Word Size:	---
Attachments:	reduced file b2.pdf

Description Ken Sharp 2020-02-15 15:21:49 UTC

Created attachment 18863 [details]
reduced file

The attached, reduced, customer file renders correctly with this command line on 9.50:

gswin64c -dBATCH -dNOPAUSE -sDEVICE=tiffsep -sOutputFile=out.tif -dNoSeparationFiles -r360 D:\temp\bike1.pdf

Since this commit:

05c41c0dedaa512419f15798cbc3da92b6a90bbc

Squashed commit fill-stroke3 branch

The renderd output is incorrect. Looking closely there are regions (bands ?) where the bike handlebars are blended with the yellow backdrop and recions where they are not. They should not be blended. In addition there are two horizontal yellow stripes towards the bottom of the intersecting yellow 'fills' which should not be present.

Rendering at lower resolution does not exhibit any problems. Taking the resolution together with the 'banded' appearance of the problem I suspect this is clist related.

The attached file is, unfortunately, still very complex. The 'image' is not a single image, its thousands of individual scan line drawn individually and butted up against one another. One of the forms contains ~2500 images.....

There are dozens of extgstates and thousands of images. Reducing the problem further will require manual work in the PDF file (the attached file is decompressed).

Comment 1 Ken Sharp 2020-02-15 15:23:26 UTC

P2 for customer (and regression), add customer number, assign to Michael (may actually need to be Ray).

Comment 2 Ray Johnston 2020-02-16 04:25:07 UTC

Created attachment 18864 [details]
b2.pdf

This is a much more simplified file. It works without clist, but fails even
with a single band. Command line:
 -Z: -o x.tif -r72 -sDEVICE=tiff32nc -dMaxBitmap=0 b2.pdf

I will coordinate with Michael Vrhel to see if he wants this, but I will take
it for now.(since it only fails with clist mode).

Comment 3 Michael Vrhel 2020-02-18 21:39:15 UTC

Should be fixed with

https://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=646007af056447fefd61eabfcdae85bfd6017d24

Thanks to Ray and Ken for doing all the heavy work of reducing the file and to Ray for finding the cause.