Re: Applying a profile to a scanned image file ...
Re: Applying a profile to a scanned image file ...
- Subject: Re: Applying a profile to a scanned image file ...
- From: Klaus Karcher <email@hidden>
- Date: Thu, 10 Feb 2011 11:43:26 +0100
Hi Barry,
Wheeler, Barry wrote:
using the Apple Automator to run “Apply ColorSync Profile to Images” on TIFFs caused them to fail the JHOVE validation process. Running the color profile change in Photoshop seems to cure that.
I forgot to mention two important things:
1.) sRGB is definitely no good choice if you process "raw" scanner or
camera files. sRGB is a monitor space, but the native colorspaces of
input devices (cameras or scanners) are completely different.
If you deal with data which has been already edited and processed to
"look good" on "standard" monitors, sRGB or AppleRGB might be a good
choice, but it would be good to know at least the gamma in this case.
"Hints" like TIFF byte order, Tags like the "TransferFunction"
"InteroperabilityIndex" and private (vendor-specific) tags and metadata
as well as some basic image analysis can be useful to make a much more
"educated guess" about the best profile to assign.
2.) Photoshop removes vendor-specific, "unknown" or seemingly
"dispensable" tags when you save the file. Therefore you probably loose
important information when you process the files with Photoshop.
I think it could be beneficial to revisit and optimize your validation
and profile assignment process. Opening and rewriting the files with
Photoshop should be only the last resort IMHO and you should make sure
to preserve vendor-specific metadata.
Fell free to contact me off-list if you are interested in further
information and assistance.
Regards,
Klaus Karcher
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