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Re: space tranform losses




In a message dated 6/14/99 10:12:13 PM, david@photopro.com writes:

>    Er... as I understand it, moving from RGB to Lab and back involves
>no losses
>in the image. It's not quite true to say that "any change of color space
>introduces some losses in the image."

If you create a simple gray wedge in a Photoshop RGB file(reset colors with 
the black/white button, and drag a gradiant across the blank image) then 
convert this image to lab and  back the histogram will have gone from a 
clean, level form to a jagged comb. This is image quality degradation. It 
happens with any image colorspace transform, except for the one from 
grayscale to RGB.

C. David Tobie
Design Cooperative
CDTobie@designcoop.com
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