python手记(31)

#!/usr/bin/env python

#-*- coding: utf-8 -*-

import cv2

import numpy as np

fn="test2.jpg"

if __name__ == '__main__':

    print 'http://blog.csdn.net/myhaspl'

    print '[email protected]'

    print

    print 'loading %s ...' % fn

    print '正在处理中',

    img = cv2.imread(fn)

    w=img.shape[1]

    h=img.shape[0]

    ii=0

    #生成日落效果

    #b[:,:] = img[:,:,0]

    #g[:,:] = img[:,:,1]

    #r[:,:] = img[:,:,2]

    for xi in xrange(0,w):

        for xj in xrange (0,h):

            img[xj,xi,0]= int(img[xj,xi,0]*0.7)

            img[xj,xi,1]= int(img[xj,xi,1]*0.7)

        if  xi%10==0 :print '.',

    cv2.namedWindow('img')

    cv2.imshow('img', img)

    cv2.waitKey()

    cv2.destroyAllWindows()

以下是数组存放红、绿、蓝的位置

    #b[:,:] = img[:,:,0]

    #g[:,:] = img[:,:,1]

    #r[:,:] = img[:,:,2]

>>> 
http://blog.csdn.net/myhaspl
[email protected]

loading test2.jpg ...
正在处理中 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
>>>

原图是：

也可以如下操作

#!/usr/bin/env python

#-*- coding: utf-8 -*-

import cv2

import numpy as np

fn="test2.jpg"

if __name__ == '__main__':

    print 'http://blog.csdn.net/myhaspl'

    print '[email protected]'

    print

    print 'loading %s ...' % fn

    print '正在处理中',

    img = cv2.imread(fn)

    w=img.shape[1]

    h=img.shape[0]

    ii=0

    #生成日落效果

    #取色彩分量

    b, g, r = cv2.split(img)

    b=b*0.7

    g=g*0.7

    #直接通过索引改变色彩分量

    img[:,:,0]=b

    img[:,:,1]=g

    cv2.namedWindow('img')

    cv2.imshow('img', img)

    cv2.waitKey()

    cv2.destroyAllWindows()