convertToBmp

for(i=0; i<IMG_SIZE; i++){  //En cada pasada estoy leyendo 4 pixeles.
    fread((int *)&buff,1,1,input);  //Leo un byte
    printf("buff vale: %x - ",buff);
    const char *byteChar = (char *)malloc(9);
    byteChar = bytetobin(buff);

    int j;
    for (j=0; j<8; j+=2){
        switch (byteChar[j]){
            case '0':
                if(byteChar[j+1] == '0')
                    putColor(output,grises->white);
                else
                    putColor(output,grises->lightGrey);
                break;
            case '1':
                if(byteChar[j+1] == '0')
                    putColor(output,grises->darkGrey);
                else{
                    putColor(output,grises->black);
                break;
        }
    }
    printf("posición %d\n",ftell(input));
}