Python图片尺寸缩放的4种方式

Python图片尺寸缩放的4种方式

最近由于网站对图片尺寸的需要,用python写了个小脚本,方便进行图片尺寸的一些调整,特记录如下:

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#coding=utf-8
import Image
import shutil
import os


class Graphics:
infile = 'D:\\myimg.jpg'
outfile = 'D:\\adjust_img.jpg'

@classmethod
def fixed_size(cls, width, height):
"""按照固定尺寸处理图片"""
im = Image.open(cls.infile)
out = im.resize((width, height),Image.ANTIALIAS)
out.save(cls.outfile)

@classmethod
def resize_by_width(cls, w_divide_h):
"""按照宽度进行所需比例缩放"""
im = Image.open(cls.infile)
(x, y) = im.size
x_s = x
y_s = x/w_divide_h
out = im.resize((x_s, y_s), Image.ANTIALIAS)
out.save(cls.outfile)

@classmethod
def resize_by_height(cls, w_divide_h):
"""按照高度进行所需比例缩放"""
im = Image.open(cls.infile)
(x, y) = im.size
x_s = y*w_divide_h
y_s = y
out = im.resize((x_s, y_s), Image.ANTIALIAS)
out.save(cls.outfile)

@classmethod
def resize_by_size(cls, size):
"""按照生成图片文件大小进行处理(单位KB)"""
size *= 1024
im = Image.open(cls.infile)
size_tmp = os.path.getsize(cls.infile)
q = 100
while size_tmp > size and q > 0:
print q
out = im.resize(im.size, Image.ANTIALIAS)
out.save(cls.outfile, quality=q)
size_tmp = os.path.getsize(cls.outfile)
q -= 5
if q == 100:
shutil.copy(cls.infile, cls.outfile)

@classmethod
def cut_by_ratio(cls, width, height):
"""按照图片长宽比进行分割"""
im = Image.open(cls.infile)
width = float(width)
height = float(height)
(x, y) = im.size
if width > height:
region = (0, int((y-(y * (height / width)))/2), x, int((y+(y * (height / width)))/2))
elif width < height:
region = (int((x-(x * (width / height)))/2), 0, int((x+(x * (width / height)))/2), y)
else:
region = (0, 0, x, y)

#裁切图片
crop_img = im.crop(region)
#保存裁切后的图片
crop_img.save(cls.outfile)
您的支持将鼓励我继续创作!