[Gimp-user] colour to black and white

[saulgoode at flashingtwelve.brickfilms.com]

There should be no white in the resulting image. When you decompose to  
RGB ("Colors->Components->Decompose"), you end up with a grayscale  
image with three layers -- one each for the red, green, and blue  
components.

When you add the layermasks, you are basically making the the black  
parts of the layers transparent and the white parts opaque. When you  
fill the layer with black, you convert the opaque parts to black.

The end result is a layer consisting of black parts and transparent  
parts (your lithographic negative). There should be no white in your  
image.

Perhaps you could describe the steps you are taking which produced an  
overlay of white and black squares?

Quoting norman <norman at littletank.org>:

> This is very interesting and to a learner like me not too complicated.
> Perhaps I did not do it quite right but I have what appears to be an
> overlay of small black and white squares. How do I get rid of that?