项目中大量用到图片加载,由于图片太大,加载速度很慢,因此需要对文件进行统一压缩
第一种
一:安装包
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python - m pip install Pillow
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二:导入包
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from PIL import Image
import os
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三:获取图片文件的大小
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def get_size( file ):
# 获取文件大小:KB
size = os.path.getsize( file )
return size / 1024
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四:输出文件夹下的文件
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dir_path = r 'file_path'
items = os.listdir(dir_path)
for item in items:
# print(item)
path = os.path.join(dir_path, item)
print (item)
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五:压缩文件到指定大小,我期望的是150KB,step和quality可以修改到最合适的数值
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def compress_image(infile, outfile = None , mb = 150 , 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 mb: 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
"""
if outfile is None :
outfile = infile
o_size = get_size(infile)
if o_size < = mb:
im = Image. open (infile)
im.save(outfile)
while o_size > mb:
im = Image. open (infile)
im.save(outfile, quality = quality)
if quality - step < 0 :
break
quality - = step
o_size = get_size(outfile)
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六:修改图片尺寸,如果同时有修改尺寸和大小的需要,可以先修改尺寸,再压缩大小
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def resize_image(infile, outfile = '', x_s = 800 ):
"""修改图片尺寸
:param infile: 图片源文件
:param outfile: 重设尺寸文件保存地址
:param x_s: 设置的宽度
:return:
"""
im = Image. open (infile)
x, y = im.size
y_s = int (y * x_s / x)
out = im.resize((x_s, y_s), Image.ANTIALIAS)
out.save(outfile)
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七:运行程序
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if __name__ = = '__main__' :
# 源路径 # 压缩后路径
compress_image(r "file_path" , r "E:\docs\2.JPG" )
# 源路径 # 压缩后路径
resize_image(r "file_path" , r "E:\docs\3.JPG" )
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第二种
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import os
from PIL import Image
import threading,time
def imgToProgressive(path):
if not path.split( '.' )[ - 1 :][ 0 ] in [ 'png' , 'jpg' , 'jpeg' ]: #if path isn't a image file,return
return
if os.path.isdir(path):
return
##########transform img to progressive
img = Image. open (path)
destination = path.split( '.' )[: - 1 ][ 0 ] + '_destination.' + path.split( '.' )[ - 1 :][ 0 ]
try :
print (path.split( '\\')[-1:][0],' 开始转换图片')
img.save(destination, "JPEG" , quality = 80 , optimize = True , progressive = True ) #转换就是直接另存为
print (path.split( '\\')[-1:][0],' 转换完毕')
except IOError:
PIL.ImageFile.MAXBLOCK = img.size[ 0 ] * img.size[ 1 ]
img.save(destination, "JPEG" , quality = 80 , optimize = True , progressive = True )
print (path.split( '\\')[-1:][0],' 转换完毕')
print ( '开始重命名文件' )
os.remove(path)
os.rename(destination,path)
for d,_,fl in os.walk(os.getcwd()): #遍历目录下所有文件
for f in fl:
try :
imgToProgressive(d + '\\' + f)
except :
pass
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以上就是python实现图片批量压缩的详细内容,更多关于python 图片压缩的资料请关注服务器之家其它相关文章!
原文链接:https://www.cnblogs.com/shizhengwen/p/14638246.html