Pattern layers contain a fixed-size bitmap image which repeats across the entire document. You can paint designs on blank pattern layers or convert images, layer content and pixel selections into pattern layers.
Patterns can be mirrored, and pattern layers can be opened as a new document to be edited separately. Filters can also be used to manipulate pattern layers.
After a pattern is added or made from a pixel selection, a bounding box indicates the "real" area of the pattern which can be transformed or edited at any time.
To create a blank pattern layer:
From the Layer menu, select New Pattern Layer.
Specify the dimensions of the pattern area that will repeat across the pattern layer—this sets the scaling of the pattern.
To create a pattern layer from a selection:
Do one of the following:
For a selected layer: Select a layer from the Layers panel with the Move Tool.