Re: [Gimp-developer] Pencil - Tool Options and Hardness

[C R <cajhne gmail com>]

> So if we get brush option to turn anti-aliasing off, we'll have 3 tools to
> make pixel art with..



Hahaha! What do you want to bet it probably works /slightly/ different than
either results from no anti-aliasing on brush, or the how the Pencil tool
works.
smh. ;) Obviously we have some things to decide. I still recommend adding
the no anti-aliasing option to the brush though, to use to test agains
these other methods.

-C


> -Petteri
>
>
> On 22.6.2016 13:40, Simon Budig wrote:
>
> > C R (cajhne gmail com) wrote:
> >
> > > Have you actually tried to do what I outlined above?
> > > > Have you? lol
> > > No - I haven't. It's not currently possible to turn off anti-aliasing on
> > > the brush tool, so it's not possible to "test" it.
> > Ah, sorry. I missed that we're discussing hypothetical future
> > characteristics of the tools here. I was just looking at the current
> > difference between the pencil and the paintbrush tool.
> >
> > However, knowing how anti-aliasing works, your statement is incorrect...
> > >
> > Well, if you choose to label the behaviour I described as
> > "pixel-grid-snapping" (or the lack thereof) as "anti-aliasing" then it
> > is not me who is making the error here. I actually don't think that they
> > are the same.
> >
> > The paintbrush tool resamples the brush when the pixel grid of the brush
> > > > is not perfectly aligned to the pixel grid of the image.
> > > Yes, but with anti-aliasing turned off (which you can't presently), it
> > > wouldn't.
> > >
> > > A perfect non-antialiased 1 pixel brush typically gets spread across
> > > > four adjacent pixels in the image, assuming you're working with a high
> > > > zoom level and don't specifically align the brush to the pixel grid of
> > > > the image.
> > > I don't know why you would assume that. :)
> > > It's incorrect at any rate.
> > This is *exactly* what the current paint brush tool does. And it really
> > is no rocket science to test it. Just do as I explained above. I even
> > did just a few moments ago, even if I knew this behaviour for years.
> >
> > Anti-aliasing IS what average pixels to spread over a 4-pixel block.
> > > If you turn it off (which, again, you can't currently in the brush tool),
> > > and a single click with a 1px brush fills more than one pixel, then that
> > > would be incorrect behaviour.
> > The Pencil tool does two things (compared to the paintbrush) that are
> > independent of each other:
> >
> > a) it thresholds the alpha channel of the brush (with a quite low
> > threshold)
> >
> > b) it snaps the pixels of the brush to the pixels of the image, so that
> > no resampling occurs.
> >
> > This is the *current* state of Gimp. And it has been like this for ages.
> >
> > If we want to put that as an option into the paintbrush (and lose the
> > pencil) then describing both of these behaviours combined as
> > "anti-aliasing" is IMHO misleading and wrong.
> >
> > Bye,
> >          Simon
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