Hi All,

I have lodged a request for GIMP to support use of transparency as a color.  By 
this I mean mainly that when using a paint tool, painting with that tool paints 
only the chosen level of transparency.  The enhancement request is here:

This email is to invite comments on the proposed enhancement.

Ability to tap a palette region with the paintbrush and then "paint" with full 

This request occurred to me after watching online digital painting tutorials 
from a couple of different sources.  In them, the artist chooses a particular 
color as their background (typically white) and, rather than erasing their 
mistakes, simply switches to the background color and paints over with it.  I 
have seen several comments on these videos (replicated across the sources) to 
the effect that this swapping to background color rather than using the eraser 
is a neat trick - mainly because it simplifies the workflow.

How would I use it?
I recently worked on an ecorche

To do this I basically had 9 tool presets
- a solid brush, no dynamics in each of 3 sizes (small, medium, large)
- the same brushes but with pressure->opacity dynamics; and
- erasers in each of the three sizes (with no dynamics)

I also had a small palette of colors.

The tool preset tab separates the brushes from the erasers.  So each time I 
swap from paint to erase and back again I spend a little time hunting, and 
breaking my concentration.

I have a Wacom tablet and the pen had an eraser on the other end from the 
stylus.  If I spin the pen around, it gives me an eraser with the right size 
and dynamics. However:
- the palm rejection on the tablet often skips while the pen is being spun in 
my hand, so I can end up in a changed window, screen or activity (I am on 
Linux); and
- the GIMP's interface doesn't seem as responsive to the eraser as to the 

I was specifically creating an onion-skinnable picture, so there had to be 
multiple layers and each layer had to have transparency so I couldn't simply 
use a background color. Any time that there are multiple overlapping layers a 
transparency brush will be useful.

I don't know how it would be implemented or whether transparent should be treated as a 
color internally.  The main point is that the workflow would be simplified if fully 
transparent were accessible through the color selection interface.  If I could add fully 
transparent as a color to a custom palette, then I could have my "eraser" and 
color selection in the same place. I know that conceptually it may be useful to draw a 
distinction between an eraser and a paintbrush but, in practise erasure is equivalent to 
painting with transparency.

Also, having transparent as a color is more consistent as the background 
"color" for layers.

I thinking only of a fully transparent brush, simply because that would be my 
use case. There would probably also be a use case for partial levels of 
transparency (this is already sort of implemented through eraser opacity).


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