iphone @2x.png to png

halfpng

#coding=utf8
import Image
import math
import os
import re
import glob

class image:
    watermarkfile_default = '~/warter.png'
    def __init__(self,watermark=''):
        self.error_message = ''
        if watermark != '':
            self.watermarkfile_default = watermark

    def error_to(self, code, target=''):
        dict_err =  {
                        'nodir':'%s 文件夹不存在',
                        'nofile':'%s 文件不存在',
                        'noimg':'%s 不是一个有效的图片(jpg, gif, png, bmp)',
                        'nowater':'%s 水印文件有误',
                        'ex_cut':'%s 生成缩略图异常错误',
                        'ex_resize':'%s 改变图像尺寸异常错误',
                        'ex_watermark':'%s 生成水印异常错误'
                    }
        self.error_message = dict_err[code] % target

    def thumbnail(self,img_path,width,height,path=None):
        '''use Image thumnail'''
        try :
            img = Image.open(img_path)
        except IOError:
            return None
        img.thumbnail((width,height),Image.ANTIALIAS)
        save_path =None
        if path:
            save_path = path
            img.save(save_path)
        else:
            base,ext = os.path.splitext(img_path)
            save_path =base+"_"+str(width)+'x'+str(width)+ext
            img.save(save_path,quality=100)
        return save_path

    def resize(self, srcfile ,width, height):
        '''将图片修改成指定大小,拉升，切割，变形
 
        –srcfile [string] 源图片文件名
        –width [int] 缩略图宽度
        –height [int] 缩略图高度
        return [bool] 成功: True, 失败: False'''
        try:
            im = Image.open(srcfile)
        except IOError:
            self.error_to('noimg',srcfile)
            return False
        try:
            mode = im.mode
            if mode not in ('L', 'RGB'):
                if mode == 'RGBA':
                    # 透明图片需要加白色底
                    alpha = im.split()[3]
                    bgmask = alpha.point(lambda x: 255-x)
                    im = im.convert('RGB')
                    # paste(color, box, mask)
                    im.paste((255,255,255), None, bgmask)
                else:
                    im = im.convert('RGB')
            im_w, im_h = im.size
            if im_w == im_h:
                region = im
            else:
                if im_w > im_h:
                    delta = (im_w - im_h)/2
                    box = (delta, 0, delta+im_h, im_h)
                else:
                    delta = (im_h - im_w)/2
                    box = (0, delta, im_w, delta+im_w)
                region = im.crop(box)
            thumb = region.resize((width,height), Image.ANTIALIAS)
            thumb.save(srcfile, quality=90)
        except:
            self.error_to('ex_resize',srcfile)
            return False
        return True
 
    def waterMark(self, srcfile, destfile = '',watermark_file=None):
        '''生成水印
 
        –srcfile [string] 源图片文件名
        –destfile [string] 目录图片文件名,默认为源图片文件
        –width [int] 缩略图宽度
        –height [int] 缩略图高度
        return [bool] 成功: True, 失败: False'''
        if destfile =='': destfile = srcfile
        if watermark_file :
            watermarkfile = watermark_file
        else:
            watermarkfile = watermarkfile_default
        try:
            im = Image.open(srcfile)
        except IOError:
            self.error_to('noimg',srcfile)
            return False
        try:
            wm = Image.open(watermarkfile)
        except IOError:
            self.error_to('nowater',watermarkfile)
            return False
        try:
            #水印自适应

            if (wm.size[0] > im.size[0]) or (wm.size[1] > im.size[1]):
                wm = self.img_resize(wm, im.size[0], im.size[1])
 
            if im.mode != 'RGBA':
                im.convert('RGBA')
            layer = Image.new('RGBA', im.size, (0,0,0,0))
            layer.paste(wm, ((im.size[0]-wm.size[0])/2, (im.size[1]-wm.size[1])/2))
            im = Image.composite(layer, im, layer)
            im.save(destfile)
        except:
            self.error_to('ex_watermark',srcfile)
            return False
        return True





imglib = image()
#############readme!!!
#this python script need PIL support
#link : http://effbot.org/media/downloads/Imaging-1.1.7.tar.gz
#python version:2.7
#Oct 17 2012
############
##############################
#config here
#set your root path
#like:(use absoulte path)
#imp_path_dir = '/Users/yourname/Desktop/resource'
#or use:
#img_path_dir = os.getcwd()
##this will get your current directory where your python file on;
##this is default value
##############################
###need to know:
###filename  must *@2x.png
###after convert name is *.png

img_path_dir = os.getcwd()

file_dirs_list = []
file_dirs_list.append(img_path_dir)
for a,b,c in os.walk(img_path_dir):
    for n in b:
#        print os.path.join(a,n)
        file_dirs_list.append(os.path.join(a,n))
file_list = []
#print file_dirs_list[0]
for dirpath in file_dirs_list:
    filesss= glob.glob(os.path.join(dirpath,"*@2x.png"))
    for i in range(0,len(filesss)):
        existFileName = filesss[i].replace("@2x.png",".png")
        if not os.path.exists(existFileName):
            file_list.append(filesss[i])

print file_list    
for fname in file_list:
    img_current = Image.open(fname)
    #build save path
    base,ext = os.path.splitext(fname)
    save_path =base.replace("@2x","")+ext
    print imglib.thumbnail(fname,img_current.size[0]/2,img_current.size[1]/2,save_path)