Faster image manipulation?

[Jeff Borckardt <jeffb at utkux dot utcc dot utk dot edu>]

I have a program that takes several full-color images, and wherever 
each image displays a predetermined color (for example blue), the 
program turns it green and coverts all other sections of the picture to 
greyscale. Here is the code that is placed in a thread in the program.
cor(c) is an array of the original pictures, cor2(c) is an array of the 
manipulated pictures, temp is a color, q is an integer
  w=cor(c).width
  h=cor(c).height
  for k=1 to 217
    if c2done(k)=false then //this is a marker to prevent duplication 
of the process below
      if stopthread=true then exit //this global variable is true if a 
cancel button is clicked
      for i=0 to w-1
        for j=0 to h-1
          temp=cor(k).rgbSurface.pixel(i,j) //gets the color of a pixel
          q=temp.red //stores the integer value of 'red' for later
          if temp=c1 then //sees if the color is one that gets turned 
green or grayscale
            cor2(k).rgbsurface.pixel(i,j)=rgb(0,255,0) //green
          else
            cor2(k).rgbsurface.pixel(i,j)=rgb(q,q,q) //greyscale
          end
        next
      next
      c2done(k)=true //mark this picture as converted
    end
  next

This takes a long time... is there a faster way?

Jeff



----------
Jeffrey J. Borckardt, Ph.D.
Department of Psychiatry and Behavioral Sciences
Medical University of South Carolina
67 President Street
IOP, 5 South BA 504 E
Charleston, SC 29425
(843)792-3295
borckard at musc dot edu

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