How to create a smooth image from data?

[lni]

Hi,

I have a 2D data matrix and a colormap that I can convert each data point to a QColor, with that I create a Format_ARGB32 image.

When I zoom in the image, the image appears very rough with square blocks (see attachment).

How can I create a smooth image from the raw data? Is it possible to use QGradient for that?

An example is very much appreciated.

Thanks!