RE: Fix for 687390 GhostScript 8.11 inserts rendering artifacts with GIFs as source

Russell,

>Did you try the 4-bit (16 colour) device as well?  Do they have the 
>same problem?

Good question.  No I had not tried the 4 bit devices.  After receiving
your email, I tried them.  There are some definite problems.  It is
surprising that no one has reported them.  The various green shades
seem to be reasonable.  However the red and blue values show a bias
toward saturated values.  Enclosed is a quickie test program which
displays 16x16x16 different colors (across 16 pages).  Comparing the
output of 24 bit color device versus the png16 device show the problems.
An example of an obvious problem is that the upper right side of the
first page contains eight solid cyan rectangles.  Only the single
rectangle in the upper left should be solid cyan.  The remaining
rectangles should be some combination of cyan and something else.

I am going to create a separate fix for this problem (the 4 bit devices).
Since a 3x3x3 cube will not fit then we seem to be left with a
2x2x2 cube as the only solution.  Thus the '16 color' devices will
be really only have 8 colors.


Dan


-----Original Message-----
From: Russell Lang [mailto:[email protected]]
Sent: Tuesday, March 30, 2004 11:58 PM
To: Dan Coby
Subject: Re: [gs-code-review] Fix for 687390 GhostScript 8.11 inserts
rendering artifacts with GIFs as source 


Dan,

Did you try the 4-bit (16 colour) device as well?  Do they have the 
same problem?


Russell Lang                   [email protected]
Ghostgum Software Pty Ltd      http://www.ghostgum.com.au/

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