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Custom color map for matrix plot?

I need colormap which has for a fixed value x the color white and all values above x are colorized from white do blue and all values below x are colorized from white to red.

The first question is, is this possible? And my second question how can I do that?

Custom color map for matrix plot?

I need colormap which has for a fixed value x the color white and all values above x are colorized from white do blue and all values below x are colorized from white to red.

The first question is, is this possible? And my second question how can I do that?