Legacy ImageMagick Discussions Archive

The SR result about the alphabets are very good I could tell what are the alphabets of the last line even with my eyes without relying on OCR, pretty amazing. I remember our professor said that fractal base algorithm is patent? Do that mean we have to pay money if we want to implement this algorithm ...

Thanks, the result are much more closer to the equation --(1/(1+exp(10*(.5-u)))-0.0066928509)*1.0092503 Although the last one has some different(precision problem?But double also give the same answer). exponential version inline float sigmoidal(float contrast, float threshold, float signal) { return ...

According to this page http://www.imagemagick.org/Usage/color_mods/#sigmoidal The equation of the sigmoidal should be (1/(1+exp(β*(α-u))) - 1/(1+exp(β))) / (1/(1+exp(β*(α-1)))/(1+exp(β))) In general, the Beta is 10 and the alpha is 0.5, IM give us a simple command "-fx" with default Beta and alpha (B ...