Re: [Gimp-user] How do you remove halos?

[Ofnuts <ofnuts laposte net>]

On 09/07/14 15:25, Nu2Gimp wrote:
> Hi Everyone,
>
> I'm very new at using Gimp. I haven't been using it for a week yet. Right now,
> I'm using the paint brush to outline objects then fill in the colors. I'm doing
> this all on a transparency.
>
> Sometimes the fill tool doesn't fill in the entire area that is blocked in by
> the paint strokes. I have to go around the edges with the paint brush and fill
> in the rest of the color. What could be causing this?
>
> When I'm ready to export them, the images look OK in Gimp. But once I export
> them, the black paint brush lines have halos around them.
>
> Are there some settings I need to make before I import images into Gimp or
> export them to my desktop? I'm working with jpg images.
>
> The thing I don't get is that with the first 2 images I worked on, I didn't have
> the halo issue. I didn't change any settings. What could have happened?
>
> If anyone can help me with:
>
> 1. Making it so the entire area I have outlined with the paint brush is filled
> in with the fill tool
>
> 2. Getting rid of the white halo lines around the areas with the brush tool
> lines
>
> I would greatly appreciate it.
>
> Thanks!

The "halo" is "anti-aliasing" pixels that are not painted because they 
have an intermediate color, and  the fill tool will either completely 
paint a pixel, or not paint it at all.  For a complete explanation, and 
the good methods, see Proper subject extraction, background removal, and 
background painting 
<http://gimpforums.com/thread-proper-subject-extraction-background-removal-and-background-painting>