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Feature: datashader also for images #449

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@LucaMarconato

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@LucaMarconato

As shown in this thread here: scverse/spatialdata-notebooks#138, when using imshow() on very sparse matrices, the resulting plot can be misleading (the same problem appears also when plotting data using in napari).

A solution could be to enable a method='datashader' approach also for render_images, so that a 2D histogram is computed and the interpolation artifacts can be better controlled.

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