Python项目中使用Pillow裁减、压缩图片
首先安装 Pillow：
install pillow
Pillow官网：https://github.com/python-pillow/Pillow
加载本地图片：
img = Image.open(img_path)
获取本地图片size：
img_size = img.size
img_w = img_size[0]
img_h = img_size[1]
以裁减为正方形为例。
判断图片宽>长还是长>款，然后是横向裁减还是纵向裁减。
left = 0
top = 0
right = 0
bottom = 0
if img_w > img_h:
left = int((img_w - img_h)/2)
top = 0
right = left + img_h
bottom = img_h
elif img_h > img_w:
left = 0
top = int((img_h - img_w)/2)
right = img_w
bottom = top + img_w
if left > 0 or top > 0 or right > 0 or bottom > 0:
# 裁剪后存储
# left, upper, right, lower
box = (left, top, right, bottom)
img_crop = img.crop(box)
img_crop_path = "{}_crop.jpg".format(img_name)
img_crop.save(img_crop_path)
获取裁减后的图片的缩略图，缩略图大小为 100 * 100
img_thumb = Image.open(img_crop_path)
thumb_size = (100, 100)
img_thumb.thumbnail(thumb_size)
img_thumb_path = "{}_thumb.jpg".format(img_name)
img_thumb.save(img_thumb_path)
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