Re: Luminosity channel...
Re: Luminosity channel...
- Subject: Re: Luminosity channel...
- From: email@hidden (Bruce Fraser)
- Date: Mon, 24 Sep 2001 08:42:04 -0700
At 9:53 AM -0400 9/24/01, CS Carl Stawicki (4211) wrote:
Hey kids-
Does anyone know how PhotoShop calculates the luminosity channel? I know
this channel represents the lightness of an image, and it doesn't actually
exist, but it is calculated somehow, with a 256 scale. Is there an actual
mathematical relationship between the luminosity channel and the color
channels (RGB or CMYK), if so what is it?
It's the L* (Lightness in Photoshop terminology) channel that you'd
get if you converted the image from whatever space it's in to Lab.
Bruce
--
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