Select Canvas
> New Image or middle-drag an empty file texture from Hypershade onto
the canvas. The Paint Effects New Texture window opens.
Type
a name for the new image in the Image name box
or click the folder icon and select an existing texture. By default,
the image will be stored in the sourceimages directory for the current
project.
Set
the canvas size, if necessary. For textures, you typically use a
square canvas (for example, 256 x 256 pixels, or 512 x 512).
Click
the Background color box to open
the Color Chooser.
Select
the background color for the image and click Accept.
For information on using the Color Chooser,
see the Basics guide.