Случайное равномерное перемешивание каналов. И полное усиление/ослабление канала.

shuffling_pastel.c

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <wand/MagickWand.h>
#include <sys/types.h>

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

void shuffle(Quantum *qr, Quantum *qg, Quantum *qb){
    int rnd = rand() % 6;
    Quantum r=*qr,b=*qb,g=*qg;
    switch (rnd){
    case 0:
        *qr=b; *qg=g;*qb=r;
        break;
    case 1:
        *qr=g; *qg=b;*qb=r;
        break;
    case 2:
        *qr=g; *qg=r; *qb=b;
        break;
    case 3:
        *qr=b; *qg=g; *qb=r;
        break;
    case 4:
        *qr=r; *qg=b; *qb=g;
        break;
    case 5:
        //nothing to do
        break;
    }
}

void shuffling(char const *sours, char const *res){
    MagickWand *mw_1,*mw_res;
    PixelIterator *imw_1,*imw_res;
    PixelWand **pmw_1,**pmw_res;
    Quantum qr_1,qg_1,qb_1;

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

    MagickWandGenesis();

    mw_1 = NewMagickWand();
    MagickReadImage(mw_1, sours);
    width = MagickGetImageWidth(mw_1);
    height = MagickGetImageHeight(mw_1);
    printf("Shuffling img 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_res = NewPixelIterator(mw_res);

    for(y = 0;y < height; ++y){
        pmw_1  = PixelGetNextIteratorRow(imw_1, &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]);

            shuffle(&qr_1,&qg_1,&qb_1);

            PixelSetRedQuantum(pmw_res[x], qr_1 );
            PixelSetGreenQuantum(pmw_res[x], qg_1 );
            PixelSetBlueQuantum(pmw_res[x], qb_1 );
        }
        PixelSyncIterator(imw_res);
    }

    MagickWriteImage(mw_res,res);

    imw_1 = DestroyPixelIterator(imw_1);
    mw_1 = DestroyMagickWand(mw_1);
    imw_res = DestroyPixelIterator(imw_res);
    mw_res = DestroyMagickWand(mw_res);

    MagickWandTerminus();
}


void pastelization(char const *sours, char const *res){
    MagickWand *mw_1,*mw_res;
    PixelIterator *imw_1,*imw_res;
    PixelWand **pmw_1,**pmw_res;
    Quantum qr_1,qg_1,qb_1;

    unsigned long y;
    register long x;
    unsigned int width,height;
    Quantum q_max = (1 << (sizeof(Quantum)*8)) - 1;
    Quantum q_aver = (1 << (sizeof(Quantum)*8)) >> 1;

    printf("%d %d",q_max,q_aver);

    MagickWandGenesis();

    mw_1 = NewMagickWand();
    MagickReadImage(mw_1, sours);
    width = MagickGetImageWidth(mw_1);
    height = MagickGetImageHeight(mw_1);
    printf("Shuffling img 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_res = NewPixelIterator(mw_res);

    for(y = 0;y < height; ++y){
        pmw_1  = PixelGetNextIteratorRow(imw_1, &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_1 = qr_1 > (q_aver) ? q_max : 0;
            qb_1 = qb_1 > (q_aver) ? q_max : 0;
            qg_1 = qg_1 > (q_aver) ? q_max : 0;

            PixelSetRedQuantum(pmw_res[x], qr_1 );
            PixelSetGreenQuantum(pmw_res[x], qg_1 );
            PixelSetBlueQuantum(pmw_res[x], qb_1 );
        }
        PixelSyncIterator(imw_res);
    }

    MagickWriteImage(mw_res,res);

    imw_1 = DestroyPixelIterator(imw_1);
    mw_1 = DestroyMagickWand(mw_1);
    imw_res = DestroyPixelIterator(imw_res);
    mw_res = DestroyMagickWand(mw_res);

    MagickWandTerminus();
}


int main(int argc, char const *argv[])
{
    srand(time(NULL));

    pastelization(argv[1],argv[2]);
    shuffling(argv[3],argv[4]);
    return 0;
}