pil

http://effbot.org/imagingbook/

一、安装

pip install PIL --allow-external PIL --allow-unverified PIL

注：新版pip不支持--allow-external了，但可直接安装

pip install pillow

如报错找不到Python.h，安装python-dev，并将Python.h所在路径加入C_INCLUDE_PATH

 

 

出现“The _imagingft C module is not installed”错误

删除pil后安装字体包再重装pil

centos:

yum install libjpeg-devel
yum install freetype-devel
yum install libpng-devel

ubuntu:
apt-get install libfreetype6-dev
os:
brew install freetype

在ubuntu的virtualenv下用pip不成功，但apt-get python-pil不会出错。

或在vitrualenv下安装pillow代替，可能需要先sudo apt-get install libjpeg8-dev

使用pillow可能出现keyerror:jpeg错误，使用from PIL import Image代替import Image

二、转为二色

 import Image
 img=Image.open('o.jpg')
 w,h=img.size
 img1=Image.new('RGB',(w,h))
 for x in range(w):
     for y in range(h):
         (r,g,b)=img.getpixel((x,y))
         if r+g+b>255:
             nc=(255,255,255)
         else:
             nc=(0,0,0)
         img1.putpixel((x,y),nc)
 img1.save('n.jpg')

转黑白
img.convert('1')

缩放

img.resize(...)

img.thumbnail((new_w, new_h))

旋转

img.rotate(angle)
滤镜

img1 = img.filter(ImageFilter.BLUR)

画图

 import ImageDraw
 draw = ImageDraw.Draw(img)
 width,height = img.size
 draw.line(((0,0),(width-1,height-1)),fill=255) #画直线
 draw.line(((0,height-1),(width-1,0)),fill=255)
 draw.arc((0,0,width-1,height-1),0,360,fill=255) #画椭圆
 img.save(self.save_file) 

增强

 import ImageEnhance
 brightness = ImageEnhance.Brightness(img)
 bright_img = brightness.enhance(2.0) ##亮度增强
 bright_img.save(img1)
 sharpness = ImageEnhance.Sharpness(img)
 sharp_img = sharpness.enhance(7.0) #锐度增强
 sharp_img.save(img1)
 contrast = ImageEnhance.Contrast(img) #对比度增强
 contrast_img = contrast.enhance(2.0)
 contrast_img.save(img1) 

三、显示

pic是jpg格式的二进制字符串

pic=file.read('1.jpg')

im=Image.open(io.BytesIO(pic)) #StringIO.StringIO(pic)

im.show()

#wx
app = wx.PySimpleApp()
# create a window/frame, no parent, -1 is default ID
# increase the size of the frame for larger images
frame1 = wx.Frame(None, -1, "An image on a panel", size = (400, 300))
bmp=wx.BitmapFromImage(wx.ImageFromStream(StringIO.StringIO(pic)))
wx.StaticBitmap(frame1, -1, bmp, (10, pos), (bmp.GetWidth(), bmp.GetHeight()))
frame1.Show(1)
app.MainLoop()