Python 实现图片色彩转换案例

前言

本文提供将图片色彩转为黑白或者褐色风格。比较类似于我们在看动漫、影视作品中，当人物在回忆过程中，体现出来的画面一般都是黑白或者褐色的。

环境依赖

ffmpeg环境依赖，ffmpy依赖安装

pip install ffmpy -i https://pypi.douban.com/simple

代码

不废话，上代码

#!/user/bin/env python
# coding=utf-8
"""
@project : csdn
@author  : 剑客阿良_ALiang
@file   : image_change_color_tool.py
@ide    : PyCharm
@time   : 2021-11-19 15:10:22
"""
import os
import uuid
from ffmpy import FFmpeg

# 黑白图
def black_and_white(image_path: str, output_dir: str):
   ext = _check_format(image_path)
   result = os.path.join(output_dir, '{}.{}'.format(uuid.uuid4(), ext))
   ff = FFmpeg(inputs={image_path: None},
               outputs={result: '-vf colorchannelmixer=.3:.4:.3:0:.3:.4:.3:0:.3:.4:.3 -y'})
   print(ff.cmd)
   ff.run()
   return result

# 褐色
def brown(image_path: str, output_dir: str):
   ext = _check_format(image_path)
   result = os.path.join(output_dir, '{}.{}'.format(uuid.uuid4(), ext))
   ff = FFmpeg(inputs={image_path: None},
               outputs={result: '-vf colorchannelmixer=.393:.769:.189:0:.349:.686:.168:0:.272:.534:.131 -y'})
   print(ff.cmd)
   ff.run()
   return result

def _check_format(image_path: str):
   ext = os.path.basename(image_path).strip().split('.')[-1]
   if ext not in ['png', 'jpg']:
       raise Exception('format error')
   return ext

代码说明

1、两个方法入参均为：图片路径、输出目录路径。

2、为了避免文件名重复，使用uuid作为文件名。

3、图片的后缀格式判断只有两种，如需增加，自行添加即可。

验证一下

图片准备，原图如下：

验证代码

if __name__ == '__main__':
   print(black_and_white('C:/Users/huyi/Desktop/4.jpg', 'C:/Users/huyi/Desktop/'))
   print(brown('C:/Users/huyi/Desktop/4.jpg', 'C:/Users/huyi/Desktop/'))

执行结果

PyDev console: starting.
Python 3.6.13 |Anaconda, Inc.| (default, Mar 16 2021, 11:37:27) [MSC v.1916 64 bit (AMD64)] on win32
runfile('D:/spyder/csdn/image_change_color_tool.py', wdir='D:/spyder/csdn')
ffmpeg -i C:/Users/huyi/Desktop/4.jpg -vf colorchannelmixer=.3:.4:.3:0:.3:.4:.3:0:.3:.4:.3 -y C:/Users/huyi/Desktop/c7052ed8-d5db-4e84-9c01-88d661c967a5.jpg
ffmpeg version n4.3.1-20-g8a2acdc6da Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 9.3-win32 (GCC) 20200320
 configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
 libavutil      56. 51.100 / 56. 51.100
 libavcodec     58. 91.100 / 58. 91.100
 libavformat    58. 45.100 / 58. 45.100
 libavdevice    58. 10.100 / 58. 10.100
 libavfilter     7. 85.100 /  7. 85.100
 libswscale      5.  7.100 /  5.  7.100
 libswresample   3.  7.100 /  3.  7.100
 libpostproc    55.  7.100 / 55.  7.100
Input #0, image2, from 'C:/Users/huyi/Desktop/4.jpg':
 Duration: 00:00:00.04, start: 0.000000, bitrate: 101138 kb/s
   Stream #0:0: Video: mjpeg (Progressive), yuvj444p(pc, bt470bg/unknown/unknown), 1920x1080, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
 Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 000001625402e2c0] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0000016253b14f80] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'C:/Users/huyi/Desktop/c7052ed8-d5db-4e84-9c01-88d661c967a5.jpg':
 Metadata:
   encoder         : Lavf58.45.100
   Stream #0:0: Video: mjpeg, yuvj444p(pc), 1920x1080, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
   Metadata:
     encoder         : Lavc58.91.100 mjpeg
   Side data:
     cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame=    1 fps=0.0 q=9.2 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.232x    
video:133kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
C:/Users/huyi/Desktop/c7052ed8-d5db-4e84-9c01-88d661c967a5.jpg
ffmpeg -i C:/Users/huyi/Desktop/4.jpg -vf colorchannelmixer=.393:.769:.189:0:.349:.686:.168:0:.272:.534:.131 -y C:/Users/huyi/Desktop/9282f36a-2361-4b0d-a115-56864c9d2337.jpg
ffmpeg version n4.3.1-20-g8a2acdc6da Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 9.3-win32 (GCC) 20200320
 configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
 libavutil      56. 51.100 / 56. 51.100
 libavcodec     58. 91.100 / 58. 91.100
 libavformat    58. 45.100 / 58. 45.100
 libavdevice    58. 10.100 / 58. 10.100
 libavfilter     7. 85.100 /  7. 85.100
 libswscale      5.  7.100 /  5.  7.100
 libswresample   3.  7.100 /  3.  7.100
 libpostproc    55.  7.100 / 55.  7.100
Input #0, image2, from 'C:/Users/huyi/Desktop/4.jpg':
 Duration: 00:00:00.04, start: 0.000000, bitrate: 101138 kb/s
   Stream #0:0: Video: mjpeg (Progressive), yuvj444p(pc, bt470bg/unknown/unknown), 1920x1080, 25 tbr, 25 tbn, 25 tbc
Stream mapping:
 Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[swscaler @ 0000013b05762f80] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 0000013b052c4fc0] deprecated pixel format used, make sure you did set range correctly
Output #0, image2, to 'C:/Users/huyi/Desktop/9282f36a-2361-4b0d-a115-56864c9d2337.jpg':
 Metadata:
   encoder         : Lavf58.45.100
   Stream #0:0: Video: mjpeg, yuvj444p(pc), 1920x1080, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
   Metadata:
     encoder         : Lavc58.91.100 mjpeg
   Side data:
     cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
frame=    1 fps=0.0 q=9.5 Lsize=N/A time=00:00:00.04 bitrate=N/A speed=0.129x    
video:177kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
C:/Users/huyi/Desktop/9282f36a-2361-4b0d-a115-56864c9d2337.jpg

黑白图效果

褐色图效果

来源：https://huyi-aliang.blog.csdn.net/article/details/121428086