Imagemagick Transparent

A quick tutorial on using Imagemagick to remove a background colour from images. The image file format needs to support transparency e.g. PNG.

NOTE: JPG doesnt support transparency, so it would be necessary to convert the file.

Remove background color

1. Set the input file

1input="old-white.png"

2. Set the output file

1output="new-image.png"

3. Set the background color to remove

1background_color="white"

4. Set the background to transparent and remove the colour white

1convert $input -transparent $background_color $output 

In the above the input image has a white background. Use Imagemagick to remove the white from the input image. The resulting image is written to the output file.