fseek(bmf, bih.bh.offset, SEEK_SET);
    fwrite(&bih, sizeof bih, 1, bmout);
    colortable ct;
    ct.pixes = arraymake(bih.width, bih.height);
    for(int i = 0; i < bih.height; ++i){
        for(int j = 0; j < bih.width; ++j){
            fread(&ct.pixes[i][j], sizeof(rgb), 1, bmf);
        }
    }