png colour gamut
png colour gamut
- Subject: png colour gamut
- From: eric <email@hidden>
- Date: Wed, 16 May 2007 13:31:51 +0100
- Thread-topic: png colour gamut
A friend of mine runs a large scale image library, part of a major world
reknowned art institution here in London. They're in the middle of a project
to digitise and sell access to their images.
Paintings are photographed using an Eyelike Precision M22. Images are saved
in the Eyelike EBU colour space as tiff files. They're then opened in
photoshop and saved as pngs.
I got involved because they were having trouble understanding colour gamuts
and the images were coming out dark and muted. Well that was easy to solve,
and I showed them about assigning different colour spaces in Photoshop. But
then I thought it strange that they made their end archiving format png.
They claimed this hadn't been a problem in the past and it was space
efficient.
So I tried to do some research on png and that just produced more questions.
Do I have this right? A png file may EITHER be in sRGB or it contains chroma
values and gamma values but not both (ie not in sRGB and chroma/gamma)?
So I opened one of their source files (.tif in eyelike ebu) and used SAVE AS
and saved it as a png. I wasn't given any options as to colour gamuts.
So here's my question. If I have it right about pngs being either in sRGB or
containing chroma and gamma values, which is Photoshop using with "save as"?
And if Photoshop SAVE AS does use sRGB, does it use relative colorimetric
to do this conversion?
And which png option is it using in SAVE FOR WEB.
And lastly, does anyone else think that going to the trouble of using an
eyelike digital back and archiving tens of thousands of museum quality
images and only save them in png format is not a good idea?
Curious to hear thoughts on the above.
Thanks in advance
Eric
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