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imagemagick
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| # convert with transparency | |
| convert screenshot2.tiff -transparent '#112332' screenshot2.png | |
| # convert with gaussian blur | |
| convert forest.jpg -gaussian-blur 0x18 forest_blur.jpg | |
| #shave 4 pixels off the top and bottom | |
| convert screenshot4.png -shave 0x4 screenshot4_crop.png | |
| # crop to square 422x422 with 0x0 offset | |
| convert mike_gravatar.jpeg -crop 422x422+0+0 mike_gravatar_square.jpeg | |
| # give circular alpha channel around it NOTE this is for a 422x422 image (note the 211x211) | |
| convert mike_gravatar_square.jpeg \( +clone -threshold -1 -negate -fill white -draw "circle 211,211,211,0" \) -alpha off -compose copy_opacity -composite mike_gravatar_circle.png | |
| # lighten an image by some amount (gamma less than one darkens, greater lightens) | |
| convert mike_gravatar_circle.png -gamma 2 mike_gravatar_circle_light_2.png | |
| # crop to square that is 100x100 http://superuser.com/questions/275476/square-thumbnails-with-imagemagick-convert | |
| convert -define jpeg:size=200x200 original.jpeg -thumbnail 100x100^ -gravity center -extent 100x100 thumbnail.jpeg | |
| # crop bottom 8px of image | |
| convert thumbnail.jpeg -crop -0-8 thumbnail_crop.jpeg | |
| # extract the alpha channel of an image | |
| convert swirl_120.png -alpha extract extracted_alpha.png | |
| # copy an alpha channel mask onto another image | |
| convert image.png \( alpha_mask.png -colorspace gray -alpha off \) -compose CopyOpacity -composite output.png |
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| # This doesn't work correctly (no idea why) | |
| #!/bin/bash | |
| if [ "$1" != "" ]; then | |
| convert $1 -resize 128x128 favicon-128.png | |
| convert $1 -resize 16x16 favicon-16.png | |
| convert $1 -resize 32x32 favicon-32.png | |
| convert $1 -resize 64x64 favicon-64.png | |
| convert favicon-16.png favicon-32.png favicon-64.png favicon-128.png -colors 256 favicon.ico | |
| fi |
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| convert logo_gts.png logo_gts.ico | |
| convert logo_gts.ico -resize 16x16 favicon-16.ico | |
| convert logo_gts.ico -resize 32x32 favicon-32.ico | |
| convert logo_gts.ico -resize 48x48 favicon-48.ico | |
| convert logo_gts.ico -resize 64x64 favicon-64.ico | |
| convert logo_gts.ico -resize 256x256 favicon-256.ico | |
| convert logo_gts.ico -resize 128x128 favicon-128.ico | |
| convert favicon-16.ico favicon-32.ico favicon-64.ico favicon-128.ico favicon-256.ico favicon.ico |
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