Hi all!

I want to reduce the number of colors like image->mode->indexed does, but just on the selected parts, not in the whole image.

Any hints?

Thanks Pere

Hi vt, thanks for the reply.

El dg 02 de 03 del 2008 a les 21:12 +0200, en/na vt va escriure:

On Sunday 02 March 2008 20:49:48 Pere Pujal i Carabantes raš?:

I want to reduce the number of colors like image->mode->indexed does, but just on the selected parts, not in the whole image.

Right cllick on selection > Colors> Posterize

Acording to what I've find on the web(and on my tests), posterize doesn't take the colors from the image like image->mode->indexed does.

Anyway, I'm unable to find a suitable equivalence from number of colors on indexed to number of levels on posterize, some doc?

Thanks Pere

Hi Chris, thanks for the reply.

El dg 02 de 03 del 2008 a les 15:47 -0600, en/na Chris Mohler va escriure:

Maybe this:

1. Copy your selection 2. Edit->Paste as New
3. Image->Mode->Indexed
4. Image->Mode-RGB
5. Select All
6. Copy
7. Paste back into original image

8 close the auxiliar image
9 confirm that I don't want to save...

To many steps, but it does just what I need, so here is a little script implementing that, it appears at colors->index-selection:

;; Copyright 2008 by Pere Pujal i Carabantes ;; License GNU/GPL
;; Author Pere Pujal i Carabantes

(define (script-fu-index-selection image
drawable
p-type
number-of-colors
palette
remove-unused
d-type
alpha-dither
)

(let*(
(dither-type (list-ref '(0 1 2 3) d-type)) (palette-type (list-ref '(0 2 3 4) p-type)) (indeximage)
)
(gimp-image-undo-group-start image) (gimp-edit-copy drawable)
(set! indeximage (car (gimp-edit-paste-as-new))) (gimp-image-convert-indexed indeximage dither-type palette-type number-of-colors alpha-dither remove-unused palette ) (gimp-image-convert-rgb indeximage) (gimp-selection-all indeximage)
(gimp-edit-copy (car (gimp-image-get-active-layer indeximage))) (gimp-floating-sel-anchor(car (gimp-edit-paste drawable 0))) (gimp-image-delete indeximage)
(gimp-displays-flush)
(gimp-image-undo-group-end image) ))

(script-fu-register
"script-fu-index-selection"
"/Colors/Index Selection"
"Reduces the colors on the current selection." "Pere Pujal i Carabantes"
"Copyright 2008"
""
""
SF-IMAGE "Image" 0
SF-DRAWABLE "Drawable" 0
SF-OPTION "Palette Type" '("MAKE-PALETTE" "WEB-PALETTE" "MONO-PALETTE" "CUSTOM-PALETTE")
SF-ADJUSTMENT "Number of Colors (ignored unless Palette type=MAKE-PALETTE)" '(255 2 256 1 25 0 0) SF-PALETTE "Palette" "Web"
SF-TOGGLE "Remove unused (ignored if Palette type=MAKE-PALETTE)" FALSE SF-OPTION "Dither type" '("NO-DITHER" "Floid Steinberg" "Floid Steinberg LowBleed" "FIXED")
SF-TOGGLE "Alpha Dither" FALSE
)

Hope this helps other people too. Yours
Pere