Raster image is often a base upon which an embroidery design is created in the Studio. Image is imported into Work Area and serves as a template to digitize from. All digitizing work is done on top of the image layer, therefore is it often reffered to as a background image.
Use of the background image for digitizing is usefull in many cases, but it is not mandatory. You can leave the image layer empty and create design on a clean background if you preffer to.
To bring image into the background of design, use main menu > Image > Import command.
Raster image is composed of square color dots called pixels (or picture elements), which in general have no exact physical size and are rendered on each device in different size. When used as template for digitizing, some physical size must be assigned to image pixels so that design drawn on top of image has required physical size. Studio uses fixed ratio between image pixels and design dimensions. 10 pixels equal 1 millimeter size, which is the same as 254 pixels for 1 inch size.
Digitizing of embroidery objects means creation (either manual or automatic) of vector objects with just few control nodes on top of the raster layer. Studio then fills digitized vector boundaries with stitches, which are the final product of digitizing.
Structure of embroidery design in Studio: 1. raster image (optional), 2. digitized vector objects, 3. final product - stitches. When saving design to a disc or other storage, all layers are kept in the same file.
Before imported raster image is suitable for digitizing, it often needs some adjuments. Studio provides tools for trimming and enhancement of raster images.