Re: png colour gamut
Re: png colour gamut
- Subject: Re: png colour gamut
- From: eric <email@hidden>
- Date: Thu, 17 May 2007 20:37:46 +0100
- Thread-topic: png colour gamut
Well thanks to all who replied, Chris Cox esp. I'm meeting up on Fri. with
some of the people from this institution and will report (I'm just doing
this as a friend). Additionally there are 2 interesting posts at the Adobe
Photoshop forum (with a post by Chris).
I'm not too techy but the gist of one of the messages is that the gamma
chunking in Photoshop's png implimentation is different on a mac and a pc
(maybe not in CS3 though) causing files to appear differently when viewing.
There may well be other issues with the gamma chunking as Chris in that post
says: " Yes, PNG's model of gamma "correction" is very flawed. "
Additionally, using "save as" seems to maintain whatever profile was
embedded in the file while Save For Web strips the profile leaving, well I
guess chaos.
On my first reading of the W3C png spec I saw only info about sRGB and/or
gamma and CIE XY info however on rereading I see there are 3 png options.
The two above plus the option of saving the embedded profile.
Although this institution is currently digitising and archiving over a
million images, I'm still going to ask them to check on archiving in Tif and
point out that storage is relatively cheap given pngs complications.
Thanks again to everyone who took time to answer.
Eric
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