Basic Examples (2) 

Where the mask is Graphics, white areas are to be filled and black areas and Background are not. For example, fill a half Disk with disks:

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Where the mask is an Image, areas of white pixels are to be filled and black areas are not. For example, create an image of a car using disks:

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Scope (4) 

The inset contents can be a Wolfram Language Image, Graphics or Graphics3D:

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If the inset contents is an image without an alpha channel, the whole image will be used:

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To use nonrectangular images, set the alpha channel to modify their shape:

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RemoveBackground can be useful preprocessing for an inset Image:

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Options (3) 

TessellateGraphics attempts to generate an inset image mask automatically from the inset image. No further inset images will be placed in masked areas. For images, the alpha channel is used to decide the mask. For Graphics and Graphics3D expressions, all primitives are used regardless of color. If the inset graphic contains transparent contents, this may cause inset graphics within the inset graphics:

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To prevent this, specify the option "Mask":

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By default, the inset image is 2% smaller than the mask, leaving space around each image. Decreasing the value of "InsetScaling" will leave more space:

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Increasing it will cause overlapping images:

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TessellateGraphics recursively fills empty space with smaller inset images. Control the number of iterations with the "MaxIterations" option. The smallest graphic to be inset is controlled by the "MinInsetSize" option given in pixel sizes from the template image:

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Possible Issues (2) 

If the inset image has PlotRangePadding, ImagePadding or a PlotRange, it may not fill its bounding box:

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Use "InsetScaling" to partially compensate:

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