Re: [Gimp-user] controlling background color

[Spencer Graves <spencer graves effectivedefense org>]

On 2018-12-21 12:01, Daumail Alain via gimp-user-list wrote:
> The png image is in indexed color mode.
>
> I presume that white or black is not one of the colors in the original 
> image.
>
> Setting Image in RGB mode ( Image > mode > RGB ) permits the usage of 
> all colors.


      Great.  That's it.  After that, I could do Layer > "New Layer" > 
"Fill with:  White", and actually get white!


      Thanks.  Spencer

> yours, Alain
>
> Le 21/12/2018 à 18:35, Spencer Graves a écrit :
> > On 2018-12-21 11:01, Alexandre Prokoudine wrote:
> > > Spencer,
> > >
> > > I tried replicating the issue you ran into and didn't manage to. If
> > > you can share your PNG file, that might help (if there's a bug in
> > > GIMP).
> >
> >
> >       See 
> > "https://www.dropbox.com/sh/uwxubmh4lcoxx3n/AABUbehkTYfKd0InpenoyEZXa?dl=0";. 
> > This contains "CCL-Logo-H2.png" and "CCL-Logo1_6.xcf".  I imported 
> > the png file, did Image > "Canvas size" > [Height = 251, y = 96] > 
> > Resize, then saved the result as the xcf file.
> >
> >
> >       If the dropbox link doesn't work for you, please suggest how I 
> > can get around this problem.  My initial post had the png file 
> > attached, but the mailman software stripped it.
> >
> >
> >       Thanks,
> >       Spencer
> > > Alex
> > >
> > > On Fri, Dec 21, 2018 at 7:58 PM Spencer Graves
> > > <spencer graves effectivedefense org> wrote:
> > > >         I solved this problem following a post "Re: frustrated" by
> > > > Alexandre Prokoudine via gimp-user-list <gimp-user-list gnome org>.
> > > > Prokoudine suggested starting File > New.  I did that, specifying 
> > > > width
> > > > and height to match the image for which I wanted white (not 
> > > > transparent)
> > > > background.  I also clicked "Advanced Options" > "Fill with" White, 
> > > > then
> > > > "OK".  Then I copied the image for which I needed a white 
> > > > background and
> > > > pasted it onto the new file.  File > "Export as" png confirmed that I
> > > > had fixed the problem.
> > > >
> > > >
> > > >         Someone else could probably provide an easier, more direct 
> > > > way to
> > > > do this, but this worked.
> > > >
> > > >
> > > >         Thanks,
> > > >         Spencer Graves
> > > >
> > > >
> > > > On 2018-12-21 03:20, Spencer Graves wrote:
> > > > > How can I control background color?
> > > > >
> > > > >
> > > > >        I've done File > Open > [a png file with a transparent 
> > > > > background].
> > > > >
> > > > >
> > > > >        This gives me an image with a transparent background.  I 
> > > > > need a
> > > > > white background.  I try Layer > "New Layer" > White, and the 
> > > > > layer is
> > > > > NOT white but a teal green that matches one of the colors in the 
> > > > > image
> > > > > I opened.  Layer > "New Layer" > "Background color" gives me the same
> > > > > teal green, which the computer seems to think is white. Layer > "New
> > > > > Layer" > "Foreground color" gives me black, which matches another of
> > > > > the colors in the image.  I've tried using the "Bucket Fill" tool 
> > > > > with
> > > > > the new layer, so far without success.
> > > > >
> > > > >
> > > > >        The image I'm trying to modify is the logo for the Citizens'
> > > > > Climate Lobby, "CCL-Logo-H2.png", which I found by downloading the
> > > > > entire web page from their web site (attached, in case your email
> > > > > system will support this).  I'm using it in a place with a black
> > > > > background, and all the lettering disappears.  See
> > > > > "www.kkfi.org/program-episodes/citizens-climate-lobby-carbon-fee-dividend". 
> > > > >
> > > > >
> > > > >
> > > > >        I've tried this with both GIMP 2.10.8 and 2.8.22 under macOS
> > > > > 10.14.2.
> > > > >
> > > > >
> > > > >        The capability surely exists.  Sadly, my web search efforts 
> > > > > and
> > > > > experimentation have so far failed to find how to fix this.
> > > > >
> > > > >
> > > > >        Suggestions?
> > > > >        Thanks,
> > > > >        Spencer Graves
> > > > >
> > > > >
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