python自动裁剪图像代码分享
本代码可以帮你自动剪切掉图片的边缘空白区域，如果你的图片有大片空白区域（只要是同一颜色形成一定的面积就认为是空白区域），下面的python代码可以帮你自动切除，如果是透明图像，会自动剪切大片的透明部分。
本代码需要PIL模块
pil相关介绍
PIL：PythonImagingLibrary，已经是Python平台事实上的图像处理标准库了。PIL功能非常强大，但API却非常简单易用。
由于PIL仅支持到Python2.7，加上年久失修，于是一群志愿者在PIL的基础上创建了兼容的版本，名字叫Pillow，支持最新Python3.x，又加入了许多新特性，因此，我们可以直接安装使用Pillow。
importImage,ImageChops
defautoCrop(image,backgroundColor=None):
'''Intelligentautomaticimagecropping.
Thisfunctionsremovestheusless"white"spacearoundanimage.
Iftheimagehasanalpha(tranparency)channel,itwillbeused
tochoosewhattocrop.
Otherwise,thisfunctionwilltrytofindthemostpopularcolor
ontheedgesoftheimageandconsiderthiscolor"whitespace".
(YoucanoverridethiscolorwiththebackgroundColorparameter)
Input:
image(aPILImageobject):Theimagetocrop.
backgroundColor(3integerstuple):eg.(0,0,255)
Thecolortoconsider"backgroundtocrop".
Iftheimageistransparent,thisparameterswillbeignored.
Iftheimageisnottransparentandthisparameterisnot
provided,itwillbeautomaticallycalculated.
Output:
aPILImageobject:Thecroppedimage.
'''
defmostPopularEdgeColor(image):
'''Computewho'sthemostpopularcolorontheedgesofanimage.
(left,right,top,bottom)
Input:
image:aPILImageobject
Ouput:
Themostpopularcolor(Atupleofintegers(R,G,B))
'''
im=image
ifim.mode!='RGB':
im=image.convert("RGB")
#Getpixelsfromtheedgesoftheimage:
width,height=im.size
left=im.crop((0,1,1,height-1))
right=im.crop((width-1,1,width,height-1))
top=im.crop((0,0,width,1))
bottom=im.crop((0,height-1,width,height))
pixels=left.tostring()+right.tostring()+top.tostring()+bottom.tostring()
#Computewho'sthemostpopularRGBtriplet
counts={}
foriinrange(0,len(pixels),3):
RGB=pixels[i]+pixels[i+1]+pixels[i+2]
ifRGBincounts:
counts[RGB]+=1
else:
counts[RGB]=1
#Getthecolourwhichisthemostpopular:
mostPopularColor=sorted([(count,rgba)for(rgba,count)incounts.items()],reverse=True)[0][1]
returnord(mostPopularColor[0]),ord(mostPopularColor[1]),ord(mostPopularColor[2])
bbox=None
#Iftheimagehasanalpha(tranparency)layer,weuseittocroptheimage.
#Otherwise,welookatthepixelsaroundtheimage(top,left,bottomandright)
#andusethemostusedcolorasthecolortocrop.
#---Fortransparentimages-----------------------------------------------
if'A'inimage.getbands():#Iftheimagehasatransparencylayer,useit.
#Thisworksforallmodeswhichhavetransparencylayer
bbox=image.split()[list(image.getbands()).index('A')].getbbox()
#---Fornon-transparentimages-------------------------------------------
elifimage.mode=='RGB':
ifnotbackgroundColor:
backgroundColor=mostPopularEdgeColor(image)
#Cropanon-transparentimage.
#.getbbox()alwayscropstheblackcolor.
#Soweneedtosubstractthe"background"colorfromourimage.
bg=Image.new("RGB",image.size,backgroundColor)
diff=ImageChops.difference(image,bg)#Substractbackgroundcolorfromimage
bbox=diff.getbbox()#Trytofindtherealboundingboxoftheimage.
else:
raiseNotImplementedError,"Sorry,thisfunctionisnotimplementedyetforimagesinmode'%s'."%image.mode
ifbbox:
image=image.crop(bbox)
returnimage
#范例：裁剪透明图片:
im=Image.open('myTransparentImage.png')
cropped=autoCrop(im)
cropped.show()
#范例：裁剪非透明图片
im=Image.open('myImage.png')
cropped=autoCrop(im)
cropped.show()
总结
以上就是本文关于python自动裁剪图像代码分享的全部内容，希望对大家有所帮助。如有不足之处，欢迎留言指出。感兴趣的朋友可以继续参阅本站：
python图像常规操作
python好玩的项目—色情图片识别代码分享
Python生成数字图片代码分享