【RGB与BGR转换问题】Numpy / OpenCV image BGR to RGB

问章来源：https://www.scivision.co/numpy-image-bgr-to-rgb/
无需
本文描述了RGB / GRB /BGR之间的转换，以及使用python读/写 音/视频的实例操作

Introduction

Generally, any/all image that we get can be described by @:
$$@=Weight\ast Height\ast Channel$$
Specifically, Conversion between any/all of BGR, RGB, and GBR may be necessary when working with:

• Matplotlib
  pyplot.imshow(): M x N x 3 image, where last dimension is RGB.
• OpenCV
  cv2.imshow(): M x N x 3 image, where last dimension is BGR
• Scientific Cameras
  some output M X N x 3 image, where last dimension is GBR
  Python BGR to RGB code: RGB_BGR_GBR_conv.py

Supplement

• BGR to RGB(OpenCV image to Matplotlib)
  rgb = bgr[...,::-1]
• RGB to BGR(Matplotlib image to OpenCV)
  bgr = rgb[...,::-1]
• RGB to GBR
  gbr = rgb[...,[2,0,1]]
• Axis order for Python images
  3-D: W x H x 3, where the last axis is color (e.g. RGB)
  4-D: W x H x 3 x 1, where the last axis is typically an alpha channel

Reference

matplot：https://www.scivision.co/tag/#matplotlib
opencv：https://www.scivision.co/tag/#opencv
Python Image and Video Read/Write Examples：https://github.com/scivision/pyimagevideo/