[Gimp-user] Converting from indexed to RGB modes; brush color off

[Maxomega]

So I was editing a sprite sheet for a video game character, and after working
with it for a bit, I noticed the color I was using was off from the brush color.
Later, I noticed the layers were behaving strange, and that it probably had
something to do with being in indexed mode.

I changed the image to RGB mode, but my brush color is still off, and layering
multiple brush colors combines the colors for some reason. My brushes are at 100
hardness and 100% opacity, so I don't know what the issue could be. I'm just
trying to paint over all the color in the image to be 00FF00, or the greenest
green.

First attached is a screenshot of the base image, unpainted. Also included is
the brush color, which already doesn't match the outside. Note that the top
layer is the active one.

Second attached is what happens when I try to draw over the image with a plain
green brush. The black rectangle is the boundary of the middle layer, but I'm
not sure why it's black at all.

Third attached is what happens when I try to do same thing (painting with the
green brush), but with the second layer active.

I'm just really confused. I don't know much about GIMP, but I've been using it
for well over 5 years and I've never come across something like this.

Attachments:
* https://www.gimpusers.com/system/attachments/1316/original/Capture.PNG
* https://www.gimpusers.com/system/attachments/1317/original/Capture2.PNG
* https://www.gimpusers.com/system/attachments/1318/original/Capture3.PNG

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Maxomega (via www.gimpusers.com/forums)
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Re: [Gimp-user] Despeckling photos

[Liam R E Quin]

On Fri, 2019-12-20 at 21:12 +0100, Gimp_Noob wrote:
> What should I do if I only have a .jpg file? In other words,there is
> nothing to scan. If I remove too many speckles it looks fake.

There's no simple answer - you have to d the best you can with what
you've got. Sometimes resizing (image->scale) by a factor of 3 can
help: open image->scale image, append
  * 3
to the width
and press tab, and GIMP will do the multiplication :) Use "cubic"
interpolation.

Then blur the now-larger image with radius 5. Then scale back down
(again cubic but you could use / 3 instead of * 3 to have GIMP do the
division) and then sharpen (filters->enhanve/>unsharp mask).

Technically what's going on is that this procedure will give the image
a wider number of pixel values - more greys - especially in 16 or 32
bit - and reduce some of the effects of jpeg artifacts.  https://www.fromoldbooks.org/
with fabulous vintage art and fascinating texts to read.
Click here to have the slave make breakfast.

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[Gimp-user] Despeckling photos

[Gimp_Noob]

>Consider a black speckle that's a square 4 pixels wide and high (for
>an
>example).
>
>The selection goes to the edge of the speckle, all round.
>
>Growing the selection by 2 pixels will make the marching ants meet in
>the middle of the speckle - but there are no pixels of it left outside
>the selection, it'snow fully selected.
>
>Shrinking the selection won't create holes, so the tiny speckles are
>gone.
>
>Experiment using 1 pixel instead of 2, or grow by 2, shrink by 1,
>feather by 1 or 2, making sure you don't lose too much detail.
>
>In practice i scan in greyscale, not black and white, so it also
>depends on the "threshhold" paraneter in the select-by-colour tool as
>to how close the the speckles the selection goes, but i use Curves
>first to brighten the hilights somewhat and to darken the shadows. If
>you are working with a film rather than something printed in a book,
>that may not be appropriate - in that case, it helps to have the image
>in Precision 16 integer of 32 floating point (from the Image/Precision
>menu) so that you don't lose detail as you work.
>
>Hope this helps,
>
>slave
Thanks.

What should I do if I only have a .jpg file? In other words,there is nothing to
scan. If I remove too many speckles it looks fake.


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Re: [Gimp-user] How to write plug-in or python to automate a filter?

[Ofnuts]

On 12/20/19 4:27 AM, 欢_John via gimp-user-list wrote:

Who could give an example please



For filters invoked from the GUI, plenty of examples here:
http://sourceforge.net/projects/gimp-tools/files/scripts/

For batch processing, see
https://stackoverflow.com/questions/44430081/how-to-run-python-scripts-using-gimpfu-from-windows-command-line/44435560#44435560



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