Bug 688797

Summary:	Transparency with pre-multiplied alpha does not match Adobe Acrobat
Product:	Ghostscript	Reporter:	Ray Johnston <ray.johnston>
Component:	PDF Interpreter	Assignee:	Alex Cherepanov <alex>
Status:	RESOLVED FIXED
Severity:	normal	CC:	htl10
Priority:	P4
Version:	master
Hardware:	All
OS:	All
Customer:		Word Size:	---
Attachments:	alpha.pdf screen grab of xpdf,acroread,gsview

Description Ray Johnston 2006-07-14 15:03:10 UTC

File generated from Office 12 (changes since Beta 2) 'Save as PDF' is not
displayed the same as Adobe Acrobat 7.0.

Testing with xpdf and OS/X preview show same output as Ghostscript (according
to Stefan).

Comment 1 Ray Johnston 2006-07-14 15:03:38 UTC

Created attachment 2354 [details]
alpha.pdf

Comment 2 Hin-Tak Leung 2006-07-17 11:27:39 UTC

Created attachment 2359 [details]
screen grab of xpdf,acroread,gsview

screen grab of the pdf under gsview, xpdf, acroread on linux.
Should be obvious which is which.

Comment 3 Ralph Giles 2006-07-19 09:53:00 UTC

Ghostscript needs to be updated to support this feature properly. Seems to be a
corner case in the spec no one has exercised before.

Comment 4 Alex Cherepanov 2010-12-01 14:35:55 UTC

This file works fine in v. 9.00 and the HEAD.