[klug] GIMP

[peterd]

Aahh, I'm with you now.

It's much easier to explain (and show) with The GIMP open (and an image 
loaded of course) rather than via email.

The three primary colours are red, blue, green, (RGB) - that is, as far 
as physics (light)  is concerned (forget the art classes back in the 
school days when one was mistakenly taught "yellow" was a primary). 
These three colours with differing %'s make up all the colours we see - 
100% of each = "white" while, yes you're correct, 0% of each = black.

The GIMP and other image editors seperate images into these three 
primary's so one can edit each primary colour to amend, change, correct, 
distort and so on as required. Each of the three primary's are refered 
to as channels.

Also, and nothing to do with the above, there are "alpha" channels which 
is all about masking parts of an image - an alpha channel mask can be 
created from one image or layer, then saved and used on another image. 
(btw, layer masks can be used only to mask the _layer_ that the mask is 
applied to - it cannot be used on another layer or image).

Starting to make sense?

Cheers,
Peter




Steve Withers wrote:

>On Mon, 2005-08-08 at 21:11, peterd wrote:
>  
>
>>Hi Steve,
>>
>>Are you refering to pixels, dpi, ppi, - resolution and that sort of 
>>thing? or stuff like layers, channels, blending modes etc :-)
>>    
>>
>
>The latter. I get layers (d'oh)....but "channels"? 
>
>Wassat? :-)  
>
>Steve 
>
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