Author Topic: Subsample Chroma?  (Read 3898 times)

Offline jonathan

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Subsample Chroma?
« on: April 24, 2007, 09:40:25 AM »
Hello All,
I have searched and can't seem to find out what the check box for "subsample chroma" does. Huh
Any info would be appreciated.
Thanks,
Jonathan Z.

Offline johannesfleitner

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Re: Subsample Chroma?
« Reply #1 on: April 24, 2007, 01:23:36 PM »
Hello Jonathan,

chroma subsampling is a color compression method.

Peter Berger writes in http://www.eostemplate.com/eos/photomechanic.html:

"Subsampling Chroma is an usual compression method to reduce file sizes. In Photo Mechanic you should always check Subsample Chroma because there is no visible loss of quality and the image files are about 20% smaller."

See also http://en.wikipedia.org/wiki/Chroma_subsampling

Regards
Johannes

Offline jonathan

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thank you for the help.
« Reply #2 on: April 24, 2007, 01:53:38 PM »
That helps a lot.
Jonathan

Offline Frantisek Vlcek

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Re: Subsample Chroma?
« Reply #3 on: April 25, 2007, 10:54:30 AM »
OTOH, I don't think it is good to subsample chroma, because you _do_ loose colour quality. Especially if you (or newspaper picturedesk) do some edits