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()