: How to view a unitless raster image at 1:1 given a desired print size? I want to preview a map that I'm generating before sending it off to the (expensive) printer. Unfortunately, the tool

@Gail6891361

You want to export the map as SVG or PDF which are Vector formats. These are scalable** without loss of quality. This way you will not need to specify pixel dimensions at all, leaving the rasterization to the Printer and their plate-making RIP.

As to the question of a 1:1 size preview: you merely need to zoom in until you can hold a real-world ruler to the virtual scale bar of your map and have the scale bar be the correct real-world size on screen. Be aware that the print density is going to be higher than the screen pixel density (1.5-3x denser) so you will only get a simulation of the printed item. If you want a true comparison, ask the printer for a test proof. You can save money on a proof by selecting a representative sample section of the finished item exported with the settings you plan on using for the final job. A 5x5 proof will be a lot cheaper than a 50x50

** regarding scaling: if you are using raster images within the vector (e.g. textures), these may not look as good when scaled upwards in size

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