Can anyone identify these plots? [duplicate]

I need to produce some plots that look like these but I'm not sure what they are called in mathematica, can anyone identify them ?

Update: I want to plot triples of the form (xvalue, yvalue, intensity) in a graph like that

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marked as duplicate by Jens, Simon Woods, whuber, Oleksandr R., Yves KlettMar 27 '13 at 19:35

Try DensityPlot! –  PlatoManiac Mar 27 '13 at 15:17
It's probably ArrayPlot. There's also MatrixPlot, Image, Graphics[Raster[...]], and ListDensityPlot (which can interpolate). For triples you need ListDensityPlot or see this –  Szabolcs Mar 27 '13 at 15:26