add image thumb handle

ahserver/imgThumb.py

@@ -0,0 +1,35 @@
+from PIL import Image
+from io import BytesIO
+
+def imageThumb(imgfilepath,width=None,height=None):
+	im = Image.open(imgfilepath)
+	mode = im.mode
+	if mode not in ('L', 'RGB'):
+		if mode == 'RGBA':
+			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')
+			
+	w, h = im.size
+	if not width and not height:
+		width = 256
+	if width:
+		height = int(float(width) * float(h) / float(w))
+	else:
+		width = int(float(height) * float(w) / float(h))
+	thumb = im.resize((width,height),Image.ANTIALIAS)
+	f = BytesIO()
+	thumb.save(f,format='jpeg',quality=60)
+	im.close()
+	v = f.getvalue()
+	with open('thumb.jpg','wb') as x:
+		x.write(v)
+	return v
+
+
+if __name__ == '__main__':
+	imageThumb("/home/ymq/media/pictures/2019-08/IMG_20190804_113014.jpg", width=256)