0.20210310: layers model

Author: zvezdochiot

LICENSE

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+Public Domain Mark 1.0
+ No Copyright
+
+    This work has been identified as being free of known restrictions
+    under copyright law, including all related and neighboring rights.
+
+    You can copy, modify, distribute and perform the work, even for
+    commercial purposes, all without asking permission. See Other
+    Information below.
+
+ Other Information
+
+    The work may not be free of known copyright restrictions in all
+    jurisdictions.
+
+    Persons may have other rights in or related to the work, such as
+    patent or trademark rights, and others may have rights in how the
+    work is used, such as publicity or privacy rights.
+
+    In some jurisdictions moral rights of the author may persist beyond
+    the term of copyright. These rights may include the right to be
+    identified as the author and the right to object to derogatory
+    treatments.
+
+    Unless expressly stated otherwise, the person who identified the work
+    makes no warranties about the work, and disclaims liability for all
+    uses of the work, to the fullest extent permitted by applicable law.
+
+    When using or citing the work, you should not imply endorsement by
+    the author or the person who identified the work.

README.md

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+# Gimp Resize RIS Plugin
+
+GIMP plugin for resize images using Reverse Interpolate Scale (RIS)
+
+This plugin is designed to resize images according to the RIS rules,
+according to which an enlarged image can be returned
+to the original image by simple averaging.
+
+![RIS resize](images/ris-resize-dialog.png)
+
+Hints:
+ * The plugin is located in : Menu -> Image -> Transform -> Resize RIS
+ * Currently it all colormode images
+
+Compare:
+
+Origin:  
+![origin](images/means-orig.png)  
+GIMP (cubic):  
+![](images/means-gimp-cubic-x4.png)  
+RIS resize (cubic):  
+![RIS resize](images/means-ris-resize-x4.png)  
+
+
+## Install:
+
+Copy `resize-ris.py` in:
+* Linux: `~/.gimp-2.8/plug-ins`
+* Windows: `C:\Program Files\GIMP 2\lib\gimp\2.0\plug-ins`
+
+----
+
+Homepage: https://github.com/ImageProcessing-ElectronicPublications/gimp-plugin-resize-ris
+
+2021

images/means-gimp-cubic-x4.png

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+###
+### Gimp-Python - allows the writing of Gimp plugins in Python.
+### Public Domain Mark 1.0
+###  No Copyright
+###
+
+from gimpfu import *
+
+PROC_NAME = 'python-fu-resize-ris'
+PROC_LABEL = 'Resize RIS'
+PROC_AUTHOR = 'zvezdochiot <[email protected]>'
+PROC_DATE = '2021-03-10'
+
+def ris(image, drawable, width, height, interpol):
+    image.undo_group_start()
+    orig_width = pdb.gimp_image_width(image)
+    orig_height = pdb.gimp_image_height(image)
+
+    copy_image = pdb.gimp_image_duplicate(image)
+    copy_drawable = pdb.gimp_image_get_active_drawable(copy_image)
+    blur_image = pdb.gimp_image_duplicate(image)
+    blur_drawable = pdb.gimp_image_get_active_drawable(blur_image)
+
+    pdb.gimp_context_set_interpolation(interpol)
+    pdb.gimp_image_scale(blur_image, width, height)
+    pdb.gimp_image_scale(blur_image, orig_width, orig_height)
+
+    blur_layer = pdb.gimp_layer_new_from_visible(blur_image, image, "ResizeBlur")
+    pdb.gimp_image_insert_layer(image, blur_layer, None, -1)
+    pdb.gimp_image_set_active_layer(image, blur_layer)
+    blur_layer.mode = SUBTRACT_MODE
+
+    copy_layer = pdb.gimp_layer_new_from_visible(copy_image, image, "CopyOrig")
+    pdb.gimp_image_insert_layer(image, copy_layer, None, -1)
+    pdb.gimp_image_set_active_layer(image, copy_layer)
+    copy_layer.mode = ADDITION_MODE
+
+    blur_layer2 = pdb.gimp_layer_new_from_visible(blur_image, image, "ResizeBlur2")
+    pdb.gimp_image_insert_layer(image, blur_layer2, None, -1)
+    pdb.gimp_image_set_active_layer(image, blur_layer2)
+    blur_layer2.mode = SUBTRACT_MODE
+
+    copy_layer2 = pdb.gimp_layer_new_from_visible(copy_image, image, "CopyOrig2")
+    pdb.gimp_image_insert_layer(image, copy_layer2, None, -1)
+    pdb.gimp_image_set_active_layer(image, copy_layer2)
+    copy_layer2.mode = ADDITION_MODE
+
+    #pdb.gimp_image_merge_down(image, blur_layer, 0)
+
+    pdb.gimp_image_delete(copy_image)
+    pdb.gimp_image_delete(blur_image)
+
+    pdb.gimp_image_scale(image, width, height)
+
+    pdb.gimp_displays_flush()
+    image.undo_group_end()
+
+register(
+    PROC_NAME,
+    PROC_LABEL,
+    "",
+    PROC_AUTHOR,
+    PROC_AUTHOR,
+    PROC_DATE,
+    PROC_LABEL,
+    "*",
+    [
+        (PF_IMAGE, "image", "_Image", None),
+        (PF_LAYER, "drawable", "_Drawable", None),
+        (PF_INT,    "width",    "Width",         512),
+        (PF_INT,    "height",   "Height",        512),
+        (PF_OPTION, "interp",   "Method",        2, ["None","Linear","Cubic","Lanczos"]),
+        #(PF_FLOAT,  "mult",     "Multiply",      1),
+    ],
+    [],
+    ris,
+    menu="<Image>/Image/Transform",
+    domain=("gimp20-python", gimp.locale_directory))
+
+main()