If you have ever wanted to manipulate images under linux you probably have used Gimp. This isn't your only option and if you want to do things from the command line a better option is to use ImageMagick's convert utility. I've put together 5 simple command line examples that I have found useful. This is just a sample of what you can do with convert. To see more examples and get more explanation of options see: ImageMagick v6 Examples. I started with the following image as a base for all the examples that follow:
1. Text annotations Example (simple text in static location): convert flower.jpg -font courier -fill white -pointsize 20 -annotate +50+50 'Flower' flower_annotate1.jpg
Produces: Example (text with background at bottom): convert flower.jpg -fill white -box '#00770080' -gravity South -pointsize 20 -annotate +0+5 ' Flower ' flower_annotate2.jpg
Produces: Look at these examples to see more. 2. Cropping an image Example: convert flower.jpg -crop 128×128+50+50 flower_crop.jpg
Produces: Look at these examples or -crop for more information. 3. Rotate an image Example: convert flower.jpg -rotate 45 flower_rotate45.jpg
Produces: Look at these examples or -rotate for more information. 4. Image montage Example: montage flower.jpg flower_unsharp.jpg -geometry '300×200+20+20' flower_montage.jpg
Produces: Look at these examples to see more. 5. Animation Example: convert flower.jpg -resize 100×100 -font courier -fill white -pointsize 20 -annotate +50+50 'Frame 1' flower_frame1.gif
convert flower.jpg -resize 100×100 -font courier -fill white -pointsize 20 -annotate +50+50 'Frame 2' flower_frame2.gif convert flower.jpg -resize 100×100 -font courier -fill white -pointsize 20 -annotate +50+50 'Frame 3' flower_frame3.gif convert flower.jpg -resize 100×100 -font courier -fill white -pointsize 20 -annotate +50+50 'Frame 4' flower_frame4.gif convert -delay 100 -size 100×100 \ -page +0+0 flower_frame1.gif \ -page +0+0 flower_frame2.gif \ -page +0+0 flower_frame3.gif \ -page +0+0 flower_frame4.gif \ -loop 0 flower_animation.gif Produces: Look at these examples, these examples, or these examples for more information. |
