Photo: Raster graphics: This is a closeup of the paintbrushes in the photo of the artist's paint palette up above. At this magnification, you can clearly see the individual colored pixels (squares) from which the image is built, like bricks in a wall....
The code for the project that this paper describes the results of is available MIT-licensed in the https://github.com/willy-b/learning-rasp repository ( recogs_examples_in_rasp.py and word-level-pos-tokens-recogs-style-decoder-loop.rasp , specifically, see also the README, noting that so...
But he explains the Smart object briefly as rather than a rendered raster file it is a raster file with the raw file embedded inside of it so that Photoshop can (in my words) give you access to the raw data. His explanation is only about one paragraph...