There's now a script on J Wiki of an earlier prototype Color Adjust which does color curve transformation, as used in popular image applications and monitor correction, with brightness, contrast, gamma parameters.
http://www.jsoftware.com/jwiki/Scripts/Color_Adjust The operation is linear-exponential (? better name) transform of the original image input: f(x) = B + C*x^(1/G) as a curve, shown over input histogram. If it is useful, it could be extended to provide better file load/save, zoom and pan, etc. --- Brian Schott <[EMAIL PROTECTED]> wrote: > Bill, > > Yes, darken works better. It expects 0<m<254, while > intensify uses 0<u<1, so I had a little trouble orienting. > Thank you. > > > On Sun, 27 May 2007, bill lam wrote: > > + Cliff(?) also suggested the following adverb to change level of lightness. > + > + darken=: 1 : '<.0.5+(255%~255-m)*y' > + imagelighten=: 1 : 'm+<.0.5+(255%~255-m)*y' > + lighten=: 1 : 'm+<.0.5+(255%~255-m)*y' > + lightenb=: 1 : 'a.{~m+<.0.5+(255%~255-m)*a.i.y' > + > + Brian Schott wrote: > + > http://www.jsoftware.com/pipermail/general/2002-November/011913.html > + > > + > In the message referenced above, an adverb > + > intensify=:1 : '[: <. (**^&(-.u)@|)&.(<:@:((2%255)&*))' > + > is recommended by Cliff Reiter. I would like to remove > + > overexposure from an photo and this adverb does not seem to > + > help with my problem. Any suggestions? > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ____________________________________________________________________________________Choose the right car based on your needs. Check out Yahoo! Autos new Car Finder tool. http://autos.yahoo.com/carfinder/ ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
