36.19 Image Transparent
20190303
A common requirement when working with graphics files that you want to include in a colourful document or to place on your web page is to convert its background from white to being transparent. Both GIF and PNG images support transparency but JPG does not. With a transparent background an image will often blend nicely with the web page or presentation background colour.
We can replace the white background of a JPG image with a transparent
background to create a PNG image using convert from
imagemagick. The key option is -transparent:
Note that after conversion we display to image to ensure all is as expected.
If the white in the original is not pure, as is often the case, we can
introduce some fuzziness to capture more of the background of the
image as transparent using -fuzz:
Other colours can be converted to transparent:
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