How to make fade edges in image magic?

问题

I want to create faded edges image effect using imagemagic commands. Please help me for a command to make effect as like http://postimg.org/image/h51e4twyp/

回答1:

Start with Doge

curl -o doge.jpg http://i0.kym-cdn.com/photos/images/newsfeed/000/581/296/c09.jpg

Next, blur the edges.

convert doge.jpg -alpha set -virtual-pixel transparent -channel A -morphology Distance Euclidean:1,20\! +channel doge.png

You will need to output it as a .png

Imagemagick documentation

Edit: The above example is for ImageMagick v6.

For IMv7 try:

convert doge.jpg \( +clone -alpha extract -virtual-pixel black -gamma 2 +level 0,100 -white-threshold 99 -morphology Distance Euclidean:1,200! -sigmoidal-contrast 3,0% \) -compose CopyOpacity -composite doge_im7.png

来源：https://stackoverflow.com/questions/20209631/how-to-make-fade-edges-in-image-magic