title: How to get RGB values of every pixel in BMP by using Qt?
body: <p>I need to write simple program which can open any BMP file, use RLE compression, save result, open it again and decompress file to normal BMP. 
  Problem is I do not know how to get RGB components of file. There are so many version of BMP standard. 
  I know how to open it in Qt, how to create, and how load in to widget, but I can not find a way to read file information and headers in one bytearray and RGB values in another. Is there in Qt some methods to do that?</p>