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This article will explain in detail how python compresses gif images. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

1. Background:

Recently wrote a CSDN blog need to upload gif map, found that the size is more than 5m, can not upload.

File size:

I wanted to find a free compression tool by myself, but the downloading tool is either fishing tool or rogue software, and some online compression tools are said to be free. When you download, you have to pay, in short, a lot of pits.

two。 Look for a solution

Because of the above tricks, I tried to find a way for python to compress gif.

2.1 Feasibility Analysis

According to my understanding is feasible, because the gif file is based on a frame of static pictures spliced according to the time sequence, if you use python to decompose the gif file into a frame of static pictures, and then compress the static picture object and then merge, in theory, you can reduce the file size.

3. Problem decomposition 3.1 decompose the gif file

You need to find a library that can decompose gif files into still images, and learn that PIL's ImageSequence can decompose gif into frames.

3.1.1 sample code from PIL import Image, ImageSequencefilename = "2018-0.gif" gif = Image.open (filename) index = 0for frame in ImageSequence.Iterator (gif): # frame.convert ('RGB') frame.save (str (index) +' .png') # pass index + = 13.1.2 effect

4. Code optimization

The code is simple.

Import imageiofrom PIL import Image, ImageSequencedef compressGif (filename): gif = Image.open (filename) if not gif.is_animated: return False imageio.mimsave ('compress-'+filename, [frame.convert (' RGB') for frame in ImageSequence.Iterator (gif)], duration = gif.info ['duration'] / 2000) fileList = ["2018-0.gif", "2018-1.gif", "2018-2.gif", "2018-3.gif" "2018-4.gif"] for filename in fileList: compressGif (filename) 5. Make a common tool 5.1 create a virtual environment

Mkvirtualenv GIF

5.2 installation of necessary libraries for virtual environment

Pip install imageio

Pip install pyinstaller packages the necessary libraries

5.3 Packaging

Pyinstaller-F compress.py

5.4. put the .gif file in the compress.exe folder

5.5 double-click .exe to view the packaging effect

5.6 the effect of compressed images

You can see that the picture is still clear after compression.

Compression ratio: 5356amp 1504 = 3.56

This compression ratio is already very high.

This is the end of the article on "how python compresses gif pictures". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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