Re: [PRODIG] LAB Degradation

[Christian Macey]

Pedro, it's a shame that Dan Margulis is not on this list to answer the  
question (I think he's teaching PS in Russia at the present time). IMHO  
Dan has come up with the best ground breaking techniques for the use of  
LAB mode. But these do not include converting to LAB just to reduce the  
size of an image. Likewise other people suggest converting to LAB from  
RGB or CMYK just to sharpen an image but this is also totally  
unnecessary.

http://www.ledet.com/margulis/ACT_postings/ACT-LABLoss.html

http://www.ledet.com/margulis/ACT_postings/ACT-LABAChannel.html

http://ep.pennnet.com/Articles/ 
Article_Display.cfm?Section=Archives&Subsection=Display&ARTICLE_ID=13576 
3&KEYWORD=photoshop

Off the top of my head the main reason one would consider converting to  
LAB from either RGB or CMYK are for 'extreme' cases of banding, noise  
reduction, colour correction and to punch the saturation in an image.  
I'm sure there are other instances but with a screaming four week old  
baby daughter in one arm (who incidentally I'm trying to start early on  
PS) and a mouse in the other, that will have to do for now.

P.S. LAB envelopes all other colour spaces and should be used with  
care. Turning on the gamut warning is a must when editing colour in  
LAB, before returning to either RGB or CMYK.

All the best,
Christian Macey
On Friday, Oct 24, 2003, at 19:49 Europe/London, Pedro Luz Cunha wrote:

Hello Steven, Christian,
�
I am not sure but I believe that in LAB mode�you get RGB and CYMK  
capabalities to work within an image color space.� It's like having a  
RGB/CMYK color space to work with.


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