Legacy ImageMagick Discussions Archive

Code: Select all

#include <Magick++.h>
#include <iostream>

using namespace std;
using namespace Magick;
int main(void) {

    Color black("black");
    Color blue("blue");
    Color yellow("yellow");
    Image tifImage("input.tif");
    size_t rows=1586, columns=1256;
        
    tifImage.modifyImage();
    tifImage.classType( DirectClass );

    PixelPacket *tifPixels = tifImage.getPixels(0,0,columns,rows);
    
    for(ssize_t i=0; i<columns*rows; i++){
        if ( *(tifPixels+i) == black ){
           *(tifPixels+i) = blue;     
        } else {
            *(tifPixels+i) = yellow;
        }
    }
    tifImage.syncPixels();
    tifImage.write("output.tif");
        
    return 0;
}

Code: Select all

        Quantum red, green, blue;        
        red = tifPixels[i].red;         // or tifPixels[i].redQuantum
        green = tifPixels[i].green;  // or tifPixels[i].greenQuantum
        blue = tifPixels[i].blue;      // or tifPixels[i].blueQuantum

Code: Select all

int main(int argc, char *argv[]) {
  InitializeMagick(NULL);
  Image img;
  ColorGray val;

  img.read(argv[1]);
  int w = img.columns();
  int h = img.rows();

  img.type(GrayscaleType);
  PixelPacket *pixels = img.getPixels(0, 0, w, h);

  val = pixels[w * 135 + 234];
  cout << "val: " << val.redQuantum() << endl;
}