Glossary
Tile collage
A single image that lays out every RDP cache tile in cache order, N tiles per row, used to spot windows whose rows line up.
A tile collage places all tiles of a cache file in one image, left to right and row by row, with a chosen number of tiles per row. bmc-tools writes one as <file>_collage.bmp (default 64 tiles per row); RDP Bitmap Cache Parser has a Collage tab with a configurable width.
When a window was cached row by row, setting the width to the window's width in tiles makes those rows line up. Because identical pieces are cached only once, the alignment drifts where pieces were deduplicated. See reconstructing RDP screens from cache tiles.