Legacy ImageMagick Discussions Archive

Thanks Pete, It is really very slow, i found a new direction, as you mention at beginning, i do need the Polynomial of the curves. P = d[0]*p^3 + d[1]*p^2 + d[2]*p + d[3]; and pass all those vaule in *d to MagickFunctionImageChannel(magick_wand_local,RedChannel,PolynomialFunction,4,d); That works ...

Hi Fred, thanks for you quick reply http://www.flickr.com/photos/59931911@N05/5474937051/ the right corner is the original image, the left image curves effect. I want to simulator this effect with IM API. Now i can do this with command line: convert test.png -channel B -fx '(1/(1+exp(10*(.5-u)))-0 ...

Fred, thank you. Your script helped me very much when i study the IM. My problem now is how to translate the script to API argument. like http://www.imagemagick.org/Usage/transform/#function_polynomial convert gradient.png -function Polynomial 4,-4,1 func_parabola.png just cant figure out how to ...

Hey Guys, i try to simulate the curve in photoshop by using MagicWand. I tried MagickFunctionImageChannel, it works well when i only has two arguments, as below: double d[4]; d[0] = 0.0; d[1] = 0.0; d[2] = 1.0; d[3] = 0.5; status = MagickFunctionImageChannel(magick_wand_local,RedChannel ...