Introduction - If you have any usage issues, please Google them yourself
For the use of Microsoft' s MODI identification pictures is a major flaw of the image format conversion problems, for online color PNG images, or a number of BMP images can not directly use it to identify, project pngcalss class implements the color spaces for image processing, including color to monochrome, color inverse, color inverting switch to grayscale, color to grayscale and other image algorithm.