LAB Colour

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LAB Colour

Postby Alpha_7 on Wed Jun 07, 2006 11:32 am

I just had my first real play with LAB colour, and I thought I was doing well but when I went to save it I thought I should convert back to sRGB and it appeared like it undid a lot of my work in LAB, have I gone about the process wrong ?

This was the end result of my trial of Lab

Image
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Postby johnd on Wed Jun 07, 2006 11:47 am

You'd have to be happy with the result Craig.
Sorry, I don't know anything about LAB colour, never played round with it.
But the image looks great. Pity about the jet lights though.
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Postby Alpha_7 on Wed Jun 07, 2006 11:52 am

johnd wrote:You'd have to be happy with the result Craig.
Sorry, I don't know anything about LAB colour, never played round with it.
But the image looks great. Pity about the jet lights though.
Cheers
John


I actually spent 2-3 hours taking shots here, so I do have some without the lights, I just randomly picked this one to play with. Perhaps Big V can enlighten me on LAB colour he seems to be a big fan of it.
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Postby NikonUser on Wed Jun 07, 2006 2:24 pm

I've also started playing with LAB colour (I've got the LAB colour book) and converting back to RGB doesn't have any negative effect...

How do you convert back?

Image -> Mode -> RGB

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Postby Willy wombat on Wed Jun 07, 2006 2:27 pm

Are there any good online guides for LAB?
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Postby NikonUser on Wed Jun 07, 2006 2:30 pm

Willy wombat wrote:Are there any good online guides for LAB?


Not that I have found.

The only tip I've found online is the one I posted a few weeks ago in the PostProcessing forum.

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Postby greencardigan on Wed Jun 07, 2006 2:38 pm

What can you do in LAB that you cant do in RGB?

Or what can be done easier/better in LAB?
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Postby NikonUser on Wed Jun 07, 2006 2:42 pm

I've only just started reading the book...

but apparently any colour manipulation can be done faster/better in LAB. There are some pretty convincing examples.

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Postby Alpha_7 on Wed Jun 07, 2006 3:24 pm

Perhaps this should be moved to the PP forum (mods?) so that the answers can help others.
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Postby Geoff on Wed Jun 07, 2006 3:25 pm

DONE!
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Postby big pix on Wed Jun 07, 2006 4:36 pm

Did you flatten the image before changing to sRGB web space.......... which will give you a lot less colour than LAB colour......
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Postby Alpha_7 on Wed Jun 07, 2006 5:02 pm

I don't think I flattened it no.

(I apologise for getting Big V and Big Pix mixed up, I think) :oops:
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Postby leek on Wed Jun 07, 2006 5:06 pm

Willy wombat wrote:Are there any good online guides for LAB?


You'll find a lot of good tips and examples in this thread on the smugmug forums - Digital Grin

http://www.dgrin.com/showthread.php?t=18203

As far as I can gather, some of the moderators and users of Digital Grin have read through Dan Margulis' book "Photoshop LAB Color" and have recreated the examples from each chapter in separate threads on the forum... A lot to read, but you'll probably find the knowledge that you seek...
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Postby MCWB on Wed Jun 07, 2006 5:56 pm

leek wrote:http://www.dgrin.com/showthread.php?t=18203

OK, my head just exploded :D, but thanks, that's a sensational read! :!:
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Postby greencardigan on Wed Jun 07, 2006 6:00 pm

MCWB wrote:
leek wrote:http://www.dgrin.com/showthread.php?t=18203

OK, my head just exploded :D, but thanks, that's a sensational read! :!:

:agree:
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Postby big pix on Wed Jun 07, 2006 6:44 pm

in photoshop..... set up actions to get into LAB colour........and back to RGB....... makes it very quick.......
Cheers ....bp....
Difference between a good street photographer and a great street photographer....
Removing objects that do not belong...
happy for the comments, but
.....Please DO NOT edit my image.....
http://bigpix.smugmug.com Forever changing
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Postby Alex on Wed Jun 07, 2006 9:25 pm

Dan Margoulis's book is a great resource on using LAB colour.

Alex
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Postby Justin on Wed Jun 07, 2006 9:27 pm

that digital grin link - there is weeks worth of messing around to be had with those tips, amazing, really good compression of the key elements to get the job done.
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Postby Grev on Tue Jun 13, 2006 2:00 am

This is interesting, anybody have more information?
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Postby Viz on Sun Oct 22, 2006 1:40 pm

I believe that a LAB curve samurai, can achieve way more with one curves layer. All photoshop calculations are in LAB anyway, they are converted to RGB/CMYK in the interface for user convenience. Though sometimes for daylight blue cast, it is so quick and easy to just touch up the blue channel in RGB.

I really love how colour theory has evolved since old Itten.
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Postby robw25 on Sun Oct 22, 2006 10:22 pm

sharpening in lab mode is better too ! i bought dons book 6 months ago .... it's full on

cheers rob
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Postby NJ on Wed Nov 01, 2006 6:14 pm

just reading this thread and then the DGrin forum (i have only had a look at the first part) and i have had a go at it. this is my effort. the changes arent huge but they are noticable.

Image
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