With the country needing to isolate due to the pandemic, my group started using Roll20 so we could continue playing. Since I started using Roll20, I have been struggling with entering the maps and getting them lined up with the Roll20 grid. I finally realized that I could make a guide layout grid in Photoshop, so I thought I would do that with one of the maps to see how off the map grid was. I was shocked to discover how much the map grid was off.
I took the map directly from the PDF into Photoshop and lined up the upper left corner of the top left square on the map grid with the Photoshop guide layout. Looking across the map, I found the map grid did not consistently line up with the Photoshop guide layout. The map grid would be off by as little as approximately .027 inches to as much as .107 inches. I tried making the same number of Photoshop guide layout columns that the map had, and I tried making the guide layout columns a consistent width, and it didn't matter. If I measured each box of one row on the map grid, the boxes would not be a uniform size.
How do you make a map on a grid when the grid is not consistent? I have always been impressed with the quality of material that Paizo puts out, but discovering the inconsistencies on map grids is very disappointing.