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When using the maps from published adventures for digital VTT gameplay (such as on Roll20 or FantasyGrounds), most players use some method to extract the raw image from the PDF and then place that in their virtual tabletop.
The problem with this is that the lossy compression used when publishing the PDF often results in images with a large number of artifacts, stretching, misaligned grids, and so forth. These kinds issues may not be visible to the naked eye when simply looking at the PDF, but when zoomed in on a virtual tabletop, they're pretty obvious. See this example here. The jpg compression artifacts are pretty noticeable around the grid lines especially.
I know this is a topic that has come up frequently in the past, but I feel like the official answers I have seen are not quite understanding the request, or it occasionally gets confused with customers wanting higher resolution print maps. In this case, I'm strictly speaking about the PDF version of the adventures you can download from Paizo's site. Higher resolution copies of the maps exist, since they are used in FantasyGround's official AP packages (which are great products, by the way!), but it'd be great to have access to these higher resolution maps for use in VTT without needing to purchase an additional product.
One of two options seem available from a technical POV:
1. Increase the resolution of maps stored in the PDF (con: will bloat file size)
2. Offer a separate download zip of high resolution VTT maps (con: more work)