Re: [Gimp-developer] What would it take to add an option for the Pencil tool to support brush transparency? (James Houx)
James Houx via gimp-developer-list (gimp-developer-list@gnome.org) wrote: > How difficult would it be to modify the pencil tool to support transparency? the regular paintbrush and the pencil tool are both using the gimppaintcore for painting the brushes. The difference between pencil and paintbrush is controlled by the "brush mode" property of the paint options. If it is == GIMP_BRUSH_HARD then the pencil behaviour is used. In app/paint/gimpbrushcore.c this is used to request the "solidified" variant of the brush, in app/paint/gimppaintcore.c it is used to round the coordinates. If you want to just change it in your personal copy without changes to the UI it seems to be fairly trivial. If you want to offer a UI it might be a bit trickier, but it should be doable. Bye, Simon -- si...@budig.de http://simon.budig.de/ ___ gimp-developer-list mailing list List address:gimp-developer-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
Re: [Gimp-developer] What would it take to add an option for the Pencil tool to support brush transparency? (James Houx)
Thanks Ell, I tried the grid brush technique. While it works for making explicit individual stamps, it does not work for holding the button down and continuously painting. That makes it not an option for my needs: as I'd have to click thousands of times, since I can't use the scatter settings to have the brush do the work for me. Only adding transparency to the pencil would fix the issue. :( I found Paint.NET after some additional searching, and there are tons of plugins for it on GitHub. One of them is called Brush Factory and claims to do RGB brush stamping technique. I'll have to try it out and see if it will do a hard stamp without sub pixel sampling. But still the plugin interface looks fairly clunky compared to just being able to do it right in GIMP. How difficult would it be to modify the pencil tool to support transparency? - James ___ gimp-developer-list mailing list List address:gimp-developer-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
Re: [Gimp-developer] What would it take to add an option for the Pencil tool to support brush transparency?
On 5/21/19 9:57 PM, James Houx via gimp-developer-list wrote:
> I /really, really /badly want this feature!?? Badly enough that I will
> have to figure out how to hack the source myself unless can tell me a
> way to accomplish it.
>
> Basically, the problem is this:
>
> The brush tool uses sub-pixel sampling to get an anti-aliased effect
> when you paint.?? I don't want this, because I'm working at pixel-level
> scale and I need exact pixel painting with anti-aliasing.
>
> The pencil tool would be the natural solution, but the pencil tool does
> not support transparency for RGB brushes!?? I'm surprised because it
> seems like such a very simple feature. :(
Right, the pencil tool lumps together both binary transparency and
pixel-grid alignment, which are really two independent things. It has
come up before, and I agree that being able to control these separately
would be useful. It's one of those simple features where generality and
consistency get in the way: Should we add this to the pencil tool, or
the paintbrush tool? What about the other paint tools, which already
suffer from an annoying lack of consistency? Should we just merge the
pencil and paintbrush tools? Or, if this separation is convenient, why
not generalize this and allow creating new tools from arbitrary tool
presets, etc.? It's a slippery slope :) Ultimately, though, I agree
that it's a useful feature.
> Without this, there's no way to do per-pixel precise painting that
> supports transparency.
It is possible, although it's a bit clunky: You need to set up a
1px-by-1px image grid ("Image -> Configure Grid..."), and enable
"View -> Snap to Grid" (and possibly also "View -> Show Grid"). This
would snap the pointer to the pixel grid in all tools, including the
paintbrush. Now, here's the clunky part: the grid offset should depend
on the brush size -- if the brush size is even, you need a grid offset
of 0px (grid along pixel edges), while if the brush size is odd, you
need an offset of 0.5px (grid along pixel centers). If the brush isn't
square, you might need different offsets in different dimensions.
--
Ell
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Re: [Gimp-developer] What would it take to add an option for the Pencil tool to support brush transparency?
On Tue, 2019-05-21 at 20:57 -0500, James Houx via gimp-developer-list wrote: > > > The pencil tool would be the natural solution, but the pencil tool > does > not support transparency for RGB brushes! I'm surprised because it > seems like such a very simple feature. :( I’m not sure what you mean. It certainly has support for transparency. otherwise, brush/pencil strokes could never miss pixels. See e.g. the green pepper brush or the confetti brush. Maybe you could explain in more detail what you mean by supporting transparency? Liam (slave ankh) -- Liam Quin - web slave for https://www.fromoldbooks.org/ with fabulous vintage art and fascinating texts to read. Click here to have the slave beaten. ___ gimp-developer-list mailing list List address:gimp-developer-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
