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--- doc:appunti:linux:gimp_batch [2022/11/23 17:18] – created niccolo
+++ doc:appunti:linux:gimp_batch [2022/11/23 17:29] – [Call the script from the command line] niccolo
@@ Line 3: / Line 3: @@
 I had a set of many scanned images from magazine pages, the sizes were varying and I wanted to apply the GIMP **erode filter** to enhance the text readability. Generally for image batch processing I use **Imagemagick** from the command line, but I was not able to reproduce the erode filter with Imagemagick, so I searched the recipe to do **batch processing** with the GIMP.
-===== The erode filter =====
+===== The plug-in-erode filter =====
 You can apply the erode filter in GIMP from menu //Filters// => //Generic// => //Erode//. There is no dialog box to control the filter parameters, but it turned out that when you want to call the **plug-in-erode** function from a script you have to pass several parameters.
@@ Line 20: / Line 20: @@
 It is not simple to have an explanation of each paramter, so I proceeded by trials. It turned out that the wanted result is obtaiuned by passing //propagate-mode// = //O:white//. I set to zero the other parameters too.
+===== Creating a script to call plug-in-erode =====
+The next step was to create a script which will simply call the plug-in, this is the file that I saved as **simple-myerode.scm**:
+<file>
+(define (simple-myerode
+            filename
+            propagate-mode
+            propagating-channel
+            propagating-rate
+            direction-mask
+            lower-limit
+            upper-limit)
+    (let* ((image (car (gimp-file-load RUN-NONINTERACTIVE filename filename)))
+           (drawable (car (gimp-image-get-active-layer image))))
+    (plug-in-erode  RUN-NONINTERACTIVE
+                    image drawable propagate-mode propagating-channel
+                    propagating-rate direction-mask lower-limit upper-limit)
+    (gimp-file-save RUN-NONINTERACTIVE image drawable filename filename)
+    (gimp-image-delete image)))
+</file>
+Copy the script into the **$HOME/.config/GIMP/2.10/scripts/** directory, no particular action is required to enable it.
+===== Call the script from the command line =====
+Now it is possibile to execute the GIMP in batch mode, using the **%%-b%%** option. Calling the custom function ''simple-myerode'' you can pass the paramteres:
+<code bash>
+#!/bin/bash
+gimp -i -b "(simple-myerode \"IMAGE.JPG\" 0 0 0 0 0 0)" -b '(gimp-quit 0)'
+</code>