Re: [Gimp-gui] GIH and GBR grayscale brushes as subset of RGB raster brush

[Americo Gobbo <jag rabisco gmail com>]

Hi All,
I have made many tests with all precision of current GIMP and is 
possible to use RGB brushes with color paint dynamics (must be studied 
which is ideal... in general all parameters transforms a RGB brush a 
grayscale brush).
The tests are demonstrated that the linear light is better for all 
precision, the painting experience performance is 2.5 faster in median 
than obtained with others options.
I am very curious and interested to study the possibilities of RGB 
brushes because we can use them to obtain many effects when used as RGB 
brush (stamp) or as Grayscale, both based in the same stain.
The versatility of the possibilities to use them could are hugely 
amplified... normal painting issues and impasto how I have already 
demonstrated using RGB brushes with clone tool, is only a example.
The possibility of the expressiveness on the different painting styles 
will be increased with this new possibility... now we have a good 
implementation of the clipboard to work RGB brush.
For this scope, I will write articles on gimp.org about raster brushes 
and mainly about the hidden possibilities of RGB brushes.

On 3/3/19 12:22 PM, Americo Gobbo wrote:
> Hi Jehan,
>
> On 3/2/19 1:37 PM, Jehan wrote:
> > Not sure I understand your questions.
> >
> > Grayscale brushes simply uses the foreground color (the brush pixels 
> > are used as a mask) whereas RGB brushes won't be affected by the 
> > foreground color. Most of the time, people want to make grayscale 
> > brushes, though RGB ones have their interest. I guess you could use 
> > them when you want to do more like some kind of images with fixed 
> > colors (typically the green pepper joke brush is RGB for instance).
> >
> > There may be actual use cases, like the other day, someone wanted to 
> > make some brush with a fixed designs for image overlays. One possible 
> > workflow could be to just make it as a RGB brush to have easy access 
> > to it (of course other workflows could be to just keep the image in a 
> > handy place and import it as layer, or to script the overlay adding, 
> > or whatever else; no unique solution).
>
> In the current GIMP version, perhaps since of 2.8, exists a hidden 
> feature to ability to use, on-the-fly, the color background in the RGB 
> brushes. If you enable 'Color' parameter on the paint dynamics is 
> possible transform a RGB brush a simple grayscale brush.
> I am supposing that the paint dynamics is always enabled for any brush 
> present on Tool Options settings... for instance, if we have a 'No 
> Dynamics' enabled is saying only that the paint dynamics doesn't have 
> any parameter enabled inner.
>
> I have some ideas and considerations how to use this feature to 
> simplify and apply the usage of RGB brushes, for instance:
> 1. Have on Tool Options the possibility to enable, via check button 
> e.g., the color parameter a hidden paint dynamics... the hidden paint 
> dynamics curves must be studied to use only the background color, for 
> instance.
> 2. In this way, we can use a RGB brush also as graycale brush... 
> without the necessity to create a dedicated set, for instance.
> 3. This approach could be interesting to simplify the brush set... 
> where in future, we could be use only RGB brushes.
>
> Thanks,
> americo
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