What is sepia threshold?
One of the options that you have when using the ImageMagick library to do your conversions is Sepia Threshold, a number that, to me at least, makes very little sense. The ImageMagick documentation suggests 80 as a good starting point, but anything between 0 and 99 is valid. Rather than try and explain what the number means we’re just going to show some examples so you can pick a number for yourself.
