How to extract X Y coordinates and RGB from pixels using python in QGIS?

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I'm trying to white a Python plugin in QGIS (2.2) to get, for each pixel of a raster image, its X Y coordinates, as well as, its RGB (3 bands) values.

At first I opened the raster file using: rlayer = QgsRasterLayer(rfileName, rbaseName)

Now I don't know how to get, for example, for pixel (1,1) its coordinates (X,Y) and its RGB color values.

Anybody could help me?

I know that I'll need to implement a DO WHILE, but I don't know the commands to extract this information of each pixel.

Thanks in advance,Mateus



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