Re: [Gimp-user] changing or assigning colors to a tiff image

[Liam R E Quin <liam holoweb net>]

On Sun, 2019-11-03 at 15:25 +0200, einel chaimovich wrote:

> I basically need to restore two colors or rather change the label -
> grey to
> green and another line (small area/ object) back to yellow.

1. look at the title bar or the GIMP window containing the image; if it
says "greyscale", use the image menu to change Mode to RGB. Now your
image can contain colours.

2. select the first thing in the image that you want to colour. You
might do this with the fuzzy select tool or the free select tool, for
example. More experienced users often use "paths" and "layer masks" but
we'll avoid that for now.

3. feather the selection (select->feather) perhaps by 5 pixels; this
softens the edges.

4. use Colours->Colourize to colour it. Again there's other ways, but
one way is enough for now.

5. Use Edit->Select None, and then select the next area. And so on.

If you're comfortable with layers, start out by duplicating the base
layer, and after each selection copy and then paste as new layer in
place, so that you can redo that colour if you make a mistake and only
spot it much later.

If not, use File->Save As every now and then.

slave liam (ankh)




> thanks, einel.
>
> On Sat, Nov 2, 2019 at 11:54 PM Liam R E Quin <liam holoweb net>
> wrote:
>
> > On Thu, 2019-10-31 at 12:08 +0200, einel chaimovich via gimp-user-
> > list
> > wrote:
> > > hey,
> > >
> > > I acquiring a tiff images which are displayed in greyscale in the
> > > software.
> > > I want to restore original colors to some of the objects. can it
> > > be
> > > done?
> >
> > Not automatically, no.
> >
> > That is, neither GIMP nor any other software can know what colour
> > socks
> > Justin was wearing based only on grey levels.
> >
> > There are some filters - e.g. "retinex" comes with GIMP, and i
> > think
> > the third-party g'mic plugin might have some - that try to guess.
> >
> > You can also select part opf your image, feather the selection, and
> > explore colours->colourize, to do one colour at a time; there are
> > other
> > methods, too, but they are somewhat more complex.
> >
> > slave ankh
> >
> > --
> > Liam Quin - web slave for https://www.fromoldbooks.org/
> > with fabulous vintage art and fascinating texts to read.