reading indexed palette image in C++

My platform is Windows. I didn't expect reading indexed palette image to be this difficult in C++. In case you are not familiar with it, it's single channel image but expresses its pixel color with 256 indexed colors called palette.

I was using OpenCV but its imread just converts the file to a 3 channel image so I have no way to save it back to indexed palette image or compare it with another indexed palette image.

I tried to use Bitmap but for some reason, it does not read correct pixel values.

So right now, I am looking for a light library or code to read pixels from indexed palette file.


Using OpenCV to read or write a image from real cameras will lose and change the image information, so I prefer to use gdi+, which is more powerful in dealing with image format problems to solve your problem.

As comments on the question shows, I decided to have two methods, OpenCV for non-indexed-palette images and Bitmap (GDI+) for indexed palette images. Now everything is working perfect.

Need Your Help

A simple way to convert to/from VARIANT types in C++

windows visual-c++ variant

Are there any easy-to-use, high-level classes or libraries that let you interact with VARIANTs in Visual C++?

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