Re: decompose, compose, recompose

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  Den 25.10.2010 22:11, skreiv Bill Skaggs:
> The "registration color" is a feature that has recently been added, I 
> believe,
> and I don't know anything about it.
Someone other knows?
> Concerning Recompose, its function is to reverse Decompose.  If you
> decompose a layer and then want to reassemble the original layer using
> Compose, you have to do a lot of work -- you have to set up all the
> component layers properly using menus.  Recompose does all of this
> silently, and replaces the original layer (the one that was decomposed)
> with the result.  If you don't alter any of the decomposed layers, 
> Recompose
> will give you exactly the result you started with (except for 
> numerical errors),
> so you won't see anything change.  If you alter one of the decomposed 
> layers
> and then choose Recompose, you should see the original layer change.
> The reason for setting this up was to make it easier to edit individual
> color channels of a layer.  For example, if you want to edit the 
> luminosity
> of a layer without affecting hues, you can decompose it as LAB, do
> whatever you want to the L channel, then do recompose, and your original
> layer will automatically show the result.
>   -- Bill
Thank you, Bill! This explained a lot.
I'll try it out and perhaps incorporate this in some way in the GIMP 
manual. I am using this plugin, together with others, very often at the 
moment checking out images before printing.

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