Hi all,

I am working on a gene expression analysis.
I want to plot the heatmap resulting from the clustering (for both arrays
and genes)

I am generating this plot with image() function with a red-black-green color
palette but the resulting image has a really poor contrast (because of the
extreme expression values most of the image is dark)

Is there a known graphical parameter or a simple idea which I can use to
obtain an image with good contrast ? (As we usually do in the pixels
settings with treeview software )

Best,

Tony

ps : I don't wanna use existing packages like heatmap or heatmap.plus as I
am customizing distances and linkage.

thanks !

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