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36551daa19
Sobel doesn't work on layers with transparency, like text layers, so the text layer in the chalk script needed to be merged with the background layer beneath it.
136 lines
4.5 KiB
Scheme
136 lines
4.5 KiB
Scheme
; GIMP - The GNU Image Manipulation Program
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; Copyright (C) 1995 Spencer Kimball and Peter Mattis
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;
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; chalk.scm version 0.11 10/10/97
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;
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; Copyright (C) 1997 Manish Singh <msingh@uclink4.berkeley.edu>
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;
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; Makes a logo with a chalk-like text effect.
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(define (apply-chalk-logo-effect img
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logo-layer
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bg-color)
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(let* (
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(width (car (gimp-drawable-width logo-layer)))
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(height (car (gimp-drawable-height logo-layer)))
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(bg-layer (car (gimp-layer-new img
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width height RGB-IMAGE
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"Background" 100 NORMAL-MODE)))
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)
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(gimp-context-push)
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(gimp-selection-none img)
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(script-fu-util-image-resize-from-layer img logo-layer)
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(script-fu-util-image-add-layers img bg-layer)
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(gimp-context-set-background bg-color)
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(gimp-edit-fill bg-layer BACKGROUND-FILL)
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; the actual effect
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(gimp-layer-set-lock-alpha logo-layer FALSE)
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(plug-in-gauss-rle RUN-NONINTERACTIVE img logo-layer 2.0 1 1)
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(plug-in-spread RUN-NONINTERACTIVE img logo-layer 5.0 5.0)
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(plug-in-ripple RUN-NONINTERACTIVE img logo-layer 27 2 0 0 0 TRUE TRUE)
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(plug-in-ripple RUN-NONINTERACTIVE img logo-layer 27 2 1 0 0 TRUE TRUE)
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; sobel doesn't work on a layer with transparency, so merge layers:
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(let ((logo-layer
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(car (gimp-image-merge-down img logo-layer EXPAND-AS-NECESSARY))))
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(plug-in-sobel RUN-NONINTERACTIVE img logo-layer TRUE TRUE TRUE)
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(gimp-levels logo-layer 0 0 120 3.5 0 255)
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; work-around for sobel edge detect screw-up (why does this happen?)
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; the top line of the image has some garbage instead of the bgcolor
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(gimp-rect-select img 0 0 width 1 CHANNEL-OP-ADD FALSE 0)
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(gimp-edit-clear logo-layer)
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)
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(gimp-selection-none img)
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(gimp-context-pop)
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)
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)
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(define (script-fu-chalk-logo-alpha img
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logo-layer
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bg-color)
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(begin
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(gimp-image-undo-group-start img)
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(apply-chalk-logo-effect img logo-layer bg-color)
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(gimp-image-undo-group-end img)
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(gimp-displays-flush)
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)
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)
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(script-fu-register "script-fu-chalk-logo-alpha"
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_"_Chalk..."
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_"Create a chalk drawing effect for the selected region (or alpha)"
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"Manish Singh <msingh@uclink4.berkeley.edu>"
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"Manish Singh"
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"October 1997"
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"RGBA"
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SF-IMAGE "Image" 0
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SF-DRAWABLE "Drawable" 0
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SF-COLOR _"Background color" "black"
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)
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(script-fu-menu-register "script-fu-chalk-logo-alpha"
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"<Image>/Filters/Alpha to Logo")
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(define (script-fu-chalk-logo text
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size
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font
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bg-color
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chalk-color)
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(let* (
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(img (car (gimp-image-new 256 256 RGB)))
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(border (/ size 4))
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(text-layer (car (gimp-text-fontname img -1 0 0 text border TRUE size PIXELS font)))
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)
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(gimp-context-push)
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(gimp-image-undo-disable img)
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(gimp-context-set-foreground chalk-color)
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(gimp-layer-set-lock-alpha text-layer TRUE)
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(gimp-edit-fill text-layer FOREGROUND-FILL)
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(apply-chalk-logo-effect img text-layer bg-color)
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(gimp-image-undo-enable img)
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(gimp-display-new img)
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(gimp-context-pop)
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)
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)
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(script-fu-register "script-fu-chalk-logo"
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_"_Chalk..."
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_"Create a logo resembling chalk scribbled on a blackboard"
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"Manish Singh <msingh@uclink4.berkeley.edu>"
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"Manish Singh"
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"October 1997"
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""
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SF-STRING _"Text" "CHALK"
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SF-ADJUSTMENT _"Font size (pixels)" '(150 2 1000 1 10 0 1)
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SF-FONT _"Font" "Sans"
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SF-COLOR _"Background color" "black"
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SF-COLOR _"Chalk color" "white"
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)
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(script-fu-menu-register "script-fu-chalk-logo"
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"<Image>/File/Create/Logos")
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