MatrixPlot[
 Fourier[Table[
   UnitStep[i, 4 - i] UnitStep[j, 7 - j], {i, -25, 25}, {j, -25, 
    25}]]]

It means, MatrixPlot as well as Rasterize can work properly finally

Raster​

MatrixPlot produces Graphics with Raster inside. However, similar function ArrayPlot won't work properly since it doesn't provide the PlotRange option.

In my implementation of Graphics it cannot guess what the plot range would be. Therefore you have to manually provide it. For example

Graphics[{
	Raster[Table[{x, y, x, y}, {x, .1, 1, .1}, {y, .1, 1, .1}]]}
	, PlotRange->{{0.1,10}, {0.1,10}
}]

Here PlotRange is necessary, otherwise it will be set to {-1,1}.

Image​

This is actually a separate entity, that uses HTML5 canvas

despite this fact, you can still easily embed it into Graphics using Inset wrapper

Please see Reference section in the frontend docs for more information. See Ya!