Find maximum between two pics.

magick2.c

//LOL. This code was writing down by Siganiv ILya.
#include <stdio.h>
#include <stdlib.h>
#include <wand/MagickWand.h>
#include <sys/types.h>

//gcc `MagickWand-config --cflags --cppflags` -o main main.c `MagickWand-config --ldflags --libs`

int main(void)
{
    MagickWand *mw_1,*mw_2,*mw_res;
    PixelIterator *imw_1,*imw_2,*imw_res;
    PixelWand **pmw_1,**pmw_2,**pmw_res;
    Quantum qr_1,qg_1,qb_1;
    Quantum qr_2,qg_2,qb_2;

    char* fname1="test1.jpg";
    char* fname2="test2.jpg";
    char* res="res.jpg";

    unsigned long y;
    register long x;
    unsigned int width,height;

    MagickWandGenesis();

    mw_1 = NewMagickWand();
    mw_2 = NewMagickWand();

    MagickReadImage(mw_1, fname1);
    MagickReadImage(mw_2, fname2);
    width = MagickGetImageWidth(mw_1);
    height = MagickGetImageHeight(mw_1);
    if (MagickGetImageWidth(mw_2) != width && MagickGetImageHeight(mw_2) != height){
        perror("Width and height doesn't match\n");
        exit(-1);
    }
    printf("width %d\nheight %d\n",width,height);

    mw_res = NewMagickWand();
    MagickSetSize(mw_res,width,height);
    MagickReadImage(mw_res,"xc:none");

    imw_1  = NewPixelIterator(mw_1);
    imw_2 = NewPixelIterator(mw_2);
    imw_res = NewPixelIterator(mw_res);

    for(y = 0;y < height; ++y){
        pmw_1  = PixelGetNextIteratorRow(imw_1, &width);
        pmw_2 = PixelGetNextIteratorRow(imw_2, &width);
        pmw_res = PixelGetNextIteratorRow(imw_res, &width);
        for (x = 0;x < (long)width; ++x){
            qr_1 = PixelGetRedQuantum(pmw_1[x]);
            qg_1 = PixelGetGreenQuantum(pmw_1[x]);
            qb_1 = PixelGetBlueQuantum(pmw_1[x]);

            qr_2 = PixelGetRedQuantum(pmw_2[x]);
            qg_2 = PixelGetGreenQuantum(pmw_2[x]);
            qb_2 = PixelGetBlueQuantum(pmw_2[x]);

            PixelSetRedQuantum(pmw_res[x], qr_1 > qr_2 ? qr_1 : qr_2 );
            PixelSetGreenQuantum(pmw_res[x], qg_1 > qg_2 ? qg_1 : qg_2 );
            PixelSetBlueQuantum(pmw_res[x], qb_1 > qb_2 ? qb_1 : qb_2 );
        }
        PixelSyncIterator(imw_res);
    }

    MagickWriteImage(mw_res,res);

    imw_1 = DestroyPixelIterator(imw_1);
    imw_2 = DestroyPixelIterator(imw_2);
    mw_1 = DestroyMagickWand(mw_1);
    mw_2 = DestroyMagickWand(mw_2);

    MagickWandTerminus();
    return 0;
}