Difference between revisions of "Linux commands"
From Organic Design wiki
m |
|||
| Line 1: | Line 1: | ||
I'm starting a list of useful linux shell commands (generally "one liners") we use a lot | I'm starting a list of useful linux shell commands (generally "one liners") we use a lot | ||
| − | == Apply an opaque background of a specified colour to a directory of transparent PNG's == | + | == Image Manipulation == |
| + | |||
| + | === Resizing JPG's and changing quality setting === | ||
| + | The first line shows how to reduce and image to 25% and quality to 50% adding "_resized" to the results filename. The second command uses Perl to apply this same command to all JPG's in the current directory. | ||
| + | {{code|<bash> | ||
| + | convert foo.jpg -resize 25% -quality 50% foo_resized.jpg | ||
| + | |||
| + | perl -e 'for (glob "*.jpg") { $img = $_; s/(....)$/_resized$1/; qx "convert $img -resize 25% -quality 50% $_"; }' | ||
| + | </bash>}} | ||
| + | |||
| + | === Apply an opaque background of a specified colour to a directory of transparent PNG's === | ||
*This command requires ImageMagick to be installed | *This command requires ImageMagick to be installed | ||
*It loops through all PNG's in the CWD and puts them in a directory called ''processed'' which must exist | *It loops through all PNG's in the CWD and puts them in a directory called ''processed'' which must exist | ||
Revision as of 23:55, 20 April 2008
I'm starting a list of useful linux shell commands (generally "one liners") we use a lot
Image Manipulation
Resizing JPG's and changing quality setting
The first line shows how to reduce and image to 25% and quality to 50% adding "_resized" to the results filename. The second command uses Perl to apply this same command to all JPG's in the current directory.
Apply an opaque background of a specified colour to a directory of transparent PNG's
- This command requires ImageMagick to be installed
- It loops through all PNG's in the CWD and puts them in a directory called processed which must exist
