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 'myhaspl@qq.com'
    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
myhaspl@qq.com


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 'myhaspl@qq.com'
    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()