Difference between revisions of "Imagemagick Batch Processing"
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This cuts out the upper left 6x17 pixels. '''+0+0''' adjusts the offset. Use '''-depth 8''' to get 8bit PNGs instead of 16bit. | 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> | <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> | <nowiki>for file in ../my_pngs/*.png; do echo $file; convert $file -crop 90x45+0+13 -scale 72x36! -depth 8 `basename $file`; done</nowiki> | ||
| + | |||
| + | ==Fade in/out== | ||
| + | A fade in and out effect for PNG sequences, easily done with '''-modulate''': | ||
| + | <nowiki># Fade in, 60 frames: | ||
| + | i=0; for file in ../my_pngs/*.png; do echo $file; convert $file -modulate $(( ( $i * 100 ) / 60 )) -depth 8 $file; i=$(($i + 1)); done | ||
| + | |||
| + | #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. | ||
Revision as of 11:46, 2 September 2013
Imagemagick provides powerful tools for image manipulation. These can be easily automated in small shell scripts or command lines.
Contents
Shellscript batch processing
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
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.
for file in ../mypics/*.JPG; do echo $file; convert "$file" -scale 2048x1536 -quality 85 `basename "$file"`; done
Crop out a section of PNG files
This cuts out the upper left 6x17 pixels. +0+0 adjusts the offset. Use -depth 8 to get 8bit PNGs instead of 16bit.
for file in ../my_pngs/*.png; do echo $file; convert $file -crop 6x17+0+0! -depth 8 `basename $file`; done
... 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:
for file in ../my_pngs/*.png; do echo $file; convert $file -crop 90x45+0+13 -scale 72x36! -depth 8 `basename $file`; done
Fade in/out
A fade in and out effect for PNG sequences, easily done with -modulate:
# Fade in, 60 frames: i=0; for file in ../my_pngs/*.png; do echo $file; convert $file -modulate $(( ( $i * 100 ) / 60 )) -depth 8 $file; i=$(($i + 1)); done #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
Attention: These examples overwrite the original files.
