Command-line utility to convert the white of an image to transparency. The core formula is taken from Gimp's color2alpha function.
The default algorithm requires scipy and imageio. The slower but more memory-efficient algorithm requires PIL.
white2alpha.py [-m] image [list_of_additional_images]
For each image in the input, an output image is created named by appending "_w2a" to the original name.
If memory is more of a concern than speed, use the "-m" option.
Yaouen Fily