Matlab基本函数-contrast函数
1、contrast函数：调整灰色对比度
2、用法说明：
（1）cmap = contrast(x) 函数返回一灰度色图cmap，该色图与当前色图x有相同的维数
（2）cmap = contrast(x,m) 函数返回维数为m×3的当前色图x的灰度色图cmap
3、实例
（1）显示框图
（2）显示图像
（3）调整图片的灰度
（4）cmap = contrast(x,m)>> cmap1 = contrast(X,100)cmap1 = 0.1248 0.1248 0.1248 0.2385 0.2385 0.2385 0.2412 0.2412 0.2412 0.2412 0.2412 0.2412 0.2635 0.2635 0.2635 0.2649 0.2649 0.2649 0.3008 0.3008 0.3008 0.3092 0.3092 0.3092 0.3092 0.3092 0.3092 0.3152 0.3152 0.3152 0.3698 0.3698 0.3698 0.3768 0.3768 0.3768 0.4076 0.4076 0.4076 0.4076 0.4076 0.4076 0.4394 0.4394 0.4394 0.4424 0.4424 0.4424 0.4631 0.4631 0.4631 0.4709 0.4709 0.4709 0.4709 0.4709 0.4709 0.4793 0.4793 0.4793 0.4841 0.4841 0.4841 0.4905 0.4905 0.4905 0.4916 0.4916 0.4916 0.4917 0.4917 0.4917 0.5003 0.5003 0.5003 0.5080 0.5080 0.5080 0.5560 0.5560 0.5560 0.5584 0.5584 0.5584 0.5598 0.5598 0.5598 0.5598 0.5598 0.5598 0.5602 0.5602 0.5602 0.5968 0.5968 0.5968 0.6003 0.6003 0.6003 0.6215 0.6215 0.6215 0.6215 0.6215 0.6215 0.6221 0.6221 0.6221 0.6398 0.6398 0.6398 0.6526 0.6526 0.6526 0.6538 0.6538 0.6538 0.6538 0.6538 0.6538 0.6545 0.6545 0.6545 0.6553 0.6553 0.6553 0.6625 0.6625 0.6625 0.6638 0.6638 0.6638 0.6638 0.6638 0.6638 0.6855 0.6855 0.6855 0.7060 0.7060 0.7060 0.7071 0.7071 0.7071 0.7096 0.7096 0.7096 0.7096 0.7096 0.7096 0.7345 0.7345 0.7345 0.7446 0.7446 0.7446 0.7637 0.7637 0.7637 0.7830 0.7830 0.7830 0.7937 0.7937 0.7937 0.7937 0.7937 0.7937 0.7943 0.7943 0.7943 0.7947 0.7947 0.7947 0.7951 0.7951 0.7951 0.7962 0.7962 0.7962 0.7962 0.7962 0.7962 0.7965 0.7965 0.7965 0.7970 0.7970 0.7970 0.7989 0.7989 0.7989 0.7990 0.7990 0.7990 0.7990 0.7990 0.7990 0.8180 0.8180 0.8180 0.8234 0.8234 0.8234 0.8376 0.8376 0.8376 0.8379 0.8379 0.8379 0.8379 0.8379 0.8379 0.8480 0.8480 0.8480 0.8486 0.8486 0.8486 0.8592 0.8592 0.8592 0.8724 0.8724 0.8724 0.8725 0.8725 0.8725 0.8725 0.8725 0.8725 0.8762 0.8762 0.8762 0.8820 0.8820 0.8820 0.8822 0.8822 0.8822 0.8823 0.8823 0.8823 0.8823 0.8823 0.8823 0.8827 0.8827 0.8827 0.8861 0.8861 0.8861 0.8884 0.8884 0.8884 0.9098 0.9098 0.9098 0.9098 0.9098 0.9098 0.9106 0.9106 0.9106 0.9173 0.9173 0.9173 0.9300 0.9300 0.9300 0.9309 0.9309 0.9309 0.9309 0.9309 0.9309 0.9310 0.9310 0.9310 0.9379 0.9379 0.9379 0.9744 0.9744 0.9744 0.9761 0.9761 0.9761 0.9761 0.9761 0.9761 0.9794 0.9794 0.9794 0.9984 0.9984 0.9984 1.0000 1.0000 1.0000
