[Zlib-devel] Proposed code change

[Glenn Randers-Pehrson]

At 08:11 PM 10/28/2006 -0700, Greg Roelofs wrote:
>> On Saturday 28 October 2006 7:11 pm, Mark Adler wrote:
>> > On Oct 28, 2006, at 7:04 AM, Steve Snyder wrote:
>> > > While profiling the display of large PNG graphics in Firefox recently
>> >
>> > I'd like to add these large PNG graphics to my suite for performance
>> > testing.  If they're available, please let me know where I can fetch
>> > them from.  Thanks.
>
>> Look here for large PNG files:  
>> http://ftp.arl.mil/ftp/historic-computers/png/
>
>> I'm particularly fond of cyber173.png (12MB), cyber7600.png (11MB) and the 
>> behemoth pdp11,70.png (20MB !).
>
>Is it just me, or is there some corruption in the middle of cyber7600.png?
>That is, the zlib data are self-consistent, but the pixels are obviously
>wrong.  (Did Glenn have anything to do with these?)

No, I didn't.  They were made by the PING guy at BRL (the late Mike Muuss), not the PNG guy.

I think the corruption was introduced by the scanner.  Note that the
GIF and JPEG formatted images (January 1994) have the same problem.

Glenn