Imagemagick Batch Processing - Revision history

Tom at 10:50, 2 September 2013

2013-09-02T10:50:00Z

Tom: /* Shellscript batch processing */

2013-09-02T10:42:05Z

‎Shellscript batch processing

Tom: /* Shellscript batch processing */

2013-09-02T10:35:34Z

‎Shellscript batch processing

Tom: /* Shellscript batch processing */

2013-09-02T09:46:58Z

‎Shellscript batch processing

Tom: /* Shellscript batch processing */

2013-09-02T09:40:41Z

‎Shellscript batch processing

Tom: /* Shellscript batch processing */

2013-09-02T09:32:56Z

‎Shellscript batch processing

Tom: Created page with "[http://www.imagemagick.org Imagemagick] provides powerful tools for image manipulation. These can be easily automated in small shell scripts or command lines. =Shellscript batc..."

2013-09-02T09:28:37Z

Created page with "[http://www.imagemagick.org Imagemagick] provides powerful tools for image manipulation. These can be easily automated in small shell scripts or command lines. =Shellscript batc..."

New page

[http://www.imagemagick.org Imagemagick] provides powerful tools for image manipulation. These can be easily automated in small shell scripts or command lines.

=Shellscript batch processing=

==Scale a bunch of photos==
This scales all .JPG files in the directory ../mypics to 2048x1536 pixels. Note that the file extension (.JPG) is case sensitive and will not match .jpg files.
<nowiki>for file in ../mypics/*.JPG; do echo $file; convert "$file" -scale 2048x1536 -quality 85 `basename "$file"`; done
</nowiki>

← Older revision		Revision as of 10:50, 2 September 2013
Line 29:		Line 29:

	=What else?=		=What else?=
−	Imagemagick convert can do much more image conversions. For example blurring~~, rotating~~, various resize methods and colour filters. See the [http://www.imagemagick.org/script/command-line-options.php Command-line options] for details.	+	* '''convert -rotate 90''' Rotates the image 90 degrees (or any multiple of 90 degrees)
		+	* '''composite -compose''' Add multiple images, also with transparency
		+
		+	Imagemagick convert can do much more image conversions. For example blurring, various resize methods and colour filters or even blending images. See the [http://www.imagemagick.org/script/command-line-options.php Command-line options] for details.

@@ Line 23: / Line 23: @@
 '''Attention:''' These two examples overwrite the original files.
-==Processing of multiple directories==
+==Process multiple directories==
 Applying the same procedure to images in all subdirectories of the current path:
   <nowiki>for dir in `find -type d`; do for file in $dir/*.png; do echo $file; convert $file -crop 24x48+12+0! -depth 8 $file; done; done</nowiki>
 '''Attention:''' Overwrites the original files.

@@ Line 2: / Line 2: @@
 =Shellscript batch processing=
-The following examples use '''basename $file''' to not overwrite the original file. Replace it by '''$file''' to overwrite the original.
+Some of the following examples use '''basename $file''' to not overwrite the original file. Replace it by '''$file''' to overwrite the original.
 ==Scale a bunch of photos==
@@ Line 21: / Line 21: @@
 #Fade out, 60 frames:
 i=60; for file in ../my_pngs/*.png; do echo $file; convert $file -modulate $(( ( $i * 100 ) / 60 )) -depth 8 $file; i=$(($i - 1)); done</nowiki>
-'''Attention:''' These examples overwrite the original files.
+'''Attention:''' These two examples overwrite the original files.

@@ Line 11: / Line 11: @@
 This cuts out the upper left 6x17 pixels. '''+0+0''' adjusts the offset. Use '''-depth 8''' to get 8bit PNGs instead of 16bit.
   <nowiki>for file in ../my_pngs/*.png; do echo $file; convert $file -crop 6x17+0+0! -depth 8 `basename $file`; done</nowiki>
-... can of course be combined with '''-scale''', here with different parameters:
+... can of course be combined with '''-scale''', here with different parameters. '''!''' ignores the aspect ratio and ensures that the output images have the exact resolution given:
   <nowiki>for file in ../my_pngs/*.png; do echo $file; convert $file -crop 90x45+0+13 -scale 72x36! -depth 8 `basename $file`; done</nowiki>

@@ Line 2: / Line 2: @@
 =Shellscript batch processing=
 ==Scale a bunch of photos==
 This scales all .JPG files in the directory ../mypics to 2048x1536 pixels. Note that the file extension (.JPG) is case sensitive and will not match .jpg files. The aspect ratio is preserved.
   <nowiki>for file in ../mypics/*.JPG; do echo $file; convert "$file" -scale 2048x1536 -quality 85 `basename "$file"`; done</nowiki>
 ==Crop out a section of PNG files==
-This cuts out the upper left 6x17 pixels. '''+0+0''' adjusts the offset
+This cuts out the upper left 6x17 pixels. '''+0+0''' adjusts the offset. Use '''-depth 8''' to get 8bit PNGs instead of 16bit.
-  <nowiki>for file in ../my_pngs/*.png; do echo $file; convert $file -crop 6x17+0+0! -depth 8 `basename $file`; done
+  <nowiki>for file in ../my_pngs/*.png; do echo $file; convert $file -crop 6x17+0+0! -depth 8 `basename $file`; done</nowiki>