Composite images are images that are composed of more than one image. A good example of this is the creation of a "panoramic" image that is actually composed of multiple images taken from slightly different angles and then combined to form a large seamless image. Another composite or montage technique is the "Joiner" technique where images that are shot with a specific configuration in mind are later pieced together like a puzzle.
Panorama Shooting suggestions
Joiner Shooting suggestions
1) The first step in the process of creating your joiner is going to be export all the images into a small size:
When working with so many at the same time, it is important that we follow a process for re-scaling images in order to have a more manageable size of file.
Get your images into the organizer
This will resize all your images to a smaller more managable size.
The next step will be to Create the Canvas
For the joiner, you'll then create a new document 3000px 3000px.
As you drag and drop your images onto your new document, you use the move tool and I suggest that you uncheck the bounding box, but keep the Auto Select Layer, and Highlight on rollover checked.
You can right click each image to adjust its stacking order
Finally, make sure you save this document as PSD format so that you don't lose your layers.
before you send your image to the printer or photo lab on your memory card or via internet, you should save it as a full resolution jpeg which will also flatten the image, remove the layers and make it easier for the lab to work with.