=D Practical usage: When I create Maps or Tokens, I set the Pixels per Inch to either 70 (for maps) or 140 (for tokens). At 200% zoom each image pixel will be 2 screen pixels, the image will look "pixelated" or "retro". At 200% zoom, 15 pixels (image) = 3 inches = 30 pixels (screen). At 100% zoom, 15 pixels (image) = 3 Inches = 15 pixels (screen). At 200% zoom, your 15 pixel by 15 pixel image will be 30 pixels x 30 pixels. Just like on Roll20, if you zoom in or out on that image, the size on screen will change. If you created an image that was 5 Pixels per Inch in Photoshop, and told it to be 3 inches by 3 inches, you would have a 15 pixel by 15 pixel image. Pixels per Inch on the screen are intended to translate well to Dots Per Inch (DPI) on a printer. Because Photoshop was originally designed for use on photos, where the size of a physical print is what the primary user is concerned about, the default measurement it uses is Pixels per Inch. Just like Roll20, Photoshop has other measurements it can use.
At 200% zoom, 15 feet = 3 Units = 420 pixels, at 50% zoom, 15 feet = 3 Units = 105 pixels. At 100% zoom, 15 feet = 3 Units = 210 pixels. In your game, the Units of your map may be assigned some other measurement scale like feet, and so the interface allows you to measure 3 Units as 15 feet, but the size of that span on screen will depend on the zoom. At 200% zoom, they are 140 pixels by 140 pixels. On screen at 100% zoom, these Units are 70 pixels by 70 pixels. Example: A creek bed north to south that is 8 Units across by 20 Units tall would be 560 pixels (8 Units x 70 pixels) by 1400 pixels (20 Units x 70 pixels) Discussion: Roll20 creates a grid that is so many Units wide by tall. For each of length and height, determine the size as: (Number of Units x Unit size (70 for maps, 140 for tokens, generally) Example: A 2x2 ogre token would be 2 Units x 140 pixels = 280 pixels wide by 280 pixels tall.
Larger sizes have more detail per Grid Square but lead to bigger files. Roll20 suggests 70 pixels per unit for maps, or 140 pixels per unit for tokens. 1 Grid Square = 1 Unit If you want your map to easily align to the grid, be certain your image's dimensions are in whole Units. The salient points: The Roll20 grid is measured in Units. The reason this is hard is because of the conceptual difference between how big something is and how big it appears.
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