Re: [Gimp-user] Color Exchange Issue

[Ofnuts <ofnuts laposte net>]

On 12/11/2013 09:51 PM, scl wrote:
> Hi,
>
> the Color Exchange tool doesn't work well for me, too.
> But there's an easier way:
> 1. Use the Select by Color tool to select the red areas.
> If not everything is selected at the first click, increase
> the Threshold value in the dialog.
> 2. Fill the selected area with plain black either with
> the Bucket Fill tool or by dragging it from the
> Foreground/Background color swatch in the toolbox.
> (If your foreground or background color is not black,
> then press 'd' first).
Select by color (and its  brother the fuzzy select tool) don't work for 
this because they always fully select the pixels or completely ignore 
them. And the text is surrounded by anti-aliasing pixels that are a 
blend of the two colors and should be only partly repainted, Otherwise 
you obtain a faint red rim (anti-aliasing pixels not selected and not 
repainted) or a jagged text ((anti-aliasing pixels selected and 
completely obliterated with the new color).

The right way to do it is to make the background transparent with either 
color-2-alpha or painting in "color erase" mode (this will make the 
anti-aliasing pixels partially transparent as needed), then give the new 
color to the background  either by adding a layer filled with the 
background color below the current layer, or by painting the current 
layer in "behind" mode.

This said this image had a formed life as a badly compressed JPEG, so 
it's not really worth editing.You'll find much better versions of that 
image using Google images.