Adding mosaic effects to an image

You can add mosaic effects to an image that already contains brushstrokes, layers, or objects. However, because mosaics are applied directly to the canvas, you need to incorporate mosaic effects carefully or you could lose some of the existing content.

When you create a mosaic, the entire canvas is automatically covered with the grout color. This obliterates images that are currently on the canvas, but leaves objects that hover above the canvas, such as layers and shapes. These objects are not deleted, but they do cover up the mosaic that you’re working on.

If you want to incorporate a mosaic with another image, you have several options:

Using selections — You can add the mosaic effect to a portion of an image by filling a selection with a mosaic effect. For information, see Stroking and filling a selection with mosaic tiles.
Using multiple documents — You can create the mosaic in its own document. When you’re satisfied with the result, float and copy the mosaic to the document where you want to composite it. For more information, see Converting selections into layers or floating objects.
Using layers — You cannot add a mosaic to a layer. However, you can float the non-mosaic portion of the image using a layer. Create the mosaic on the canvas and when you’re satisfied with the mosaic, you can drop the layers.

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