Legacy ImageMagick Discussions Archive

Hi,

I have the following scanned text with a yellowish background that I want to remove.
http://nvlpubs.nist.gov/nistpubs/bullet ... 05_a2b.pdf

Under matlab I usually get the average of color here srgba(91%,80%,58%,1) set in hvs colorspace and remove all arround a fuzz 3D ellipsoid in HSV space.

Any idea to do better ?

Bastien

I don't know what you are asking.

IM's "-fuzz" takes one parameter, which is the radius of a sphere in the 3D colour cube. (Or 4D, for CMYK). This is always a sphere, not ellipsoid. But you can get the same effect by first multiplying channels, or using "-level".

With a smarter script, you can find the mean colour of an area, and also the maximum and minimum, and calculate the fuzz that covers the entire range.

try this on the first page. if you like it, then you can do all pages.

thanks it work better with +2%

Adjust as desired, obviously.