使用Pillow库，可以使用resize()函数来调整图片的大小：
from PIL import Image
img = Image.open('image.jpg')
img = img.resize((200, 200)) # 调整图片大小为200x200像素
img.save('image_resized.jpg') # 保存调整后的图片
先对图片进行二值化处理。
由于这些格子大小均匀，所以可以使用常规的除法，先裁剪出第一个格子：
e=a[:,:,0].shape
f=a[0:int(e[0]/9),0:int(e[1]/9)]
io.imsave('00.png',f)
下图是等比例放大的效果图。
第一列第二个格子：
m=1
n=0
f=a[int(m*e[0]/9):int((m+1)*e[0]/9),int(n*e[1]/9):int((n+1)*e[1]/9)]
第一行第二个格子：
m=0
n=1
f=a[int(m*e[0]/9):int((m+1)*e[0]/9),int(n*e[1]/9):int((n+1)*e[1]/9)]
这样，用for循环，可以实现全部裁剪：
for m in range(9):
for n in range(9):
f=a[int(m*e[0]/9):int((m+1)*e[0]/9),int(n*e[1]/9):int((n+1)*e[1]/9)]
io.imsave('0/'+str(m)+'-'+str(n)+'.png',f)
去除边界的黑框，只保留数字或空白：
for m in range(9):
for n in range(9):
f=a[int(m*e[0]/9)+10:int((m+1)*e[0]/9)-10,int(n*e[1]/9)+10:int((n+1)*e[1]/9)-10]
io.imsave('0/'+str(m)+'-'+str(n)+'.png',f)
How do I read image data from a URL in Python?
importosimportImagefileName ='c:/py/jb51.jpg'fp =open(fileName,'rb')im =Image.open(fp)fp.close()x,y =im.sizeifx <300or y < 300: os.remove(fileName)from PIL import Imageimport requestsimport numpy as npfrom StringIO import StringIOresponse = requests.get(url)img = np.array(Image.open(StringIO(response.content)))
from PIL import Imageimport urllib2
im = Image.open(urllib2.urlopen(url))
or if you use requests:
from PIL import Imageimport requests
im = Image.open(requests.get(url, stream=True).raw)
[python] view plain copy
[html] view plain copy
#coding:utf-8
'''
python图片处理
'''
import Image as image
#等比例压缩图片
def resizeImg(**args):
args_key = {'ori_img':'','dst_img':'','dst_w':'','dst_h':'','save_q':75}
arg = {}
for key in args_key:
if key in args:
arg[key] = args[key]
im = image.open(arg['ori_img'])
ori_w,ori_h = im.size
widthRatio = heightRatio = None
ratio = 1
if (ori_w and ori_w > arg['dst_w']) or (ori_h and ori_h > arg['dst_h']):
if arg['dst_w'] and ori_w > arg['dst_w']:
widthRatio = float(arg['dst_w']) / ori_w #正确获取小数的方式
if arg['dst_h'] and ori_h > arg['dst_h']:
heightRatio = float(arg['dst_h']) / ori_h
if widthRatio and heightRatio:
if widthRatio < heightRatio:
ratio = widthRatio
else:
ratio = heightRatio
if widthRatio and not heightRatio:
ratio = widthRatio
if heightRatio and not widthRatio:
ratio = heightRatio
newWidth = int(ori_w * ratio)
newHeight = int(ori_h * ratio)
else:
newWidth = ori_w
newHeight = ori_h
im.resize((newWidth,newHeight),image.ANTIALIAS).save(arg['dst_img'],quality=arg['save_q'])
'''
image.ANTIALIAS还有如下值：
NEAREST: use nearest neighbour
BILINEAR: linear interpolation in a 2x2 environment
BICUBIC:cubic spline interpolation in a 4x4 environment
ANTIALIAS:best down-sizing filter
'''
#裁剪压缩图片
def clipResizeImg(**args):
args_key = {'ori_img':'','dst_img':'','dst_w':'','dst_h':'','save_q':75}
arg = {}
for key in args_key:
if key in args:
arg[key] = args[key]
im = image.open(arg['ori_img'])
ori_w,ori_h = im.size
dst_scale = float(arg['dst_h']) / arg['dst_w'] #目标高宽比
ori_scale = float(ori_h) / ori_w #原高宽比
if ori_scale >= dst_scale:
#过高
width = ori_w
height = int(width*dst_scale)
x = 0
y = (ori_h - height) / 3
else:
#过宽
height = ori_h
width = int(height*dst_scale)
x = (ori_w - width) / 2
y = 0
#裁剪
box = (x,y,width+x,height+y)
#这里的参数可以这么认为：从某图的(x,y)坐标开始截，截到(width+x,height+y)坐标
#所包围的图像，crop方法与php中的imagecopy方法大为不一样
newIm = im.crop(box)
im = None
#压缩
ratio = float(arg['dst_w']) / width
newWidth = int(width * ratio)
newHeight = int(height * ratio)
newIm.resize((newWidth,newHeight),image.ANTIALIAS).save(arg['dst_img'],quality=arg['save_q'])
#水印(这里仅为图片水印)
def waterMark(**args):
args_key = {'ori_img':'','dst_img':'','mark_img':'','water_opt':''}
arg = {}
for key in args_key:
if key in args:
arg[key] = args[key]
im = image.open(arg['ori_img'])
ori_w,ori_h = im.size
mark_im = image.open(arg['mark_img'])
mark_w,mark_h = mark_im.size
option ={'leftup':(0,0),'rightup':(ori_w-mark_w,0),'leftlow':(0,ori_h-mark_h),
'rightlow':(ori_w-mark_w,ori_h-mark_h)
}
im.paste(mark_im,option[arg['water_opt']],mark_im.convert('RGBA'))
im.save(arg['dst_img'])
#Demon
#源图片
ori_img = 'D:/tt.jpg'
#水印标
mark_img = 'D:/mark.png'
#水印位置(右下)
water_opt = 'rightlow'
#目标图片
dst_img = 'D:/python_2.jpg'
#目标图片大小
dst_w = 94
dst_h = 94
#保存的图片质量
save_q = 35
#裁剪压缩
clipResizeImg(ori_img=ori_img,dst_img=dst_img,dst_w=dst_w,dst_h=dst_h,save_q = save_q)
#等比例压缩
#resizeImg(ori_img=ori_img,dst_img=dst_img,dst_w=dst_w,dst_h=dst_h,save_q=save_q)
#水印
#waterMark(ori_img=ori_img,dst_img=dst_img,mark_img=mark_img,water_opt=water_opt)
