图片压缩功能

apps/utils/img.py

@@ -0,0 +1,25 @@
+import os
+from PIL import Image
+ 
+def compress_image(infile, outfile='', kb=80, step=10, quality=80):
+    """不改变图片尺寸压缩到指定大小
+    :param infile: 压缩源文件
+    :param outfile: 压缩文件保存地址
+    :param kb: 压缩目标, KB
+    :param step: 每次调整的压缩比率
+    :param quality: 初始压缩比率
+    :return: 压缩文件地址，压缩文件大小
+    """
+    o_size = os.path.getsize(infile)/1024
+    if o_size <= kb:
+        return infile
+    if outfile == '':
+        outfile = infile
+    while o_size > kb:
+        im = Image.open(infile)
+        im.save(outfile, quality=quality)
+        if quality - step < 0:
+            break
+        quality -= step
+        o_size = os.path.getsize(outfile)/1024
+    return outfile, o_size