I took a guess that someone might use RonyaSoft Poster Printer to piece something together that was 24 x 30 inches. A complication - many apps will not save that resolution or dpi in the image file, so you may have to set it each time you open that image whenever the dpi is important. The total number of pixels be the same, but they'll be much closer together so the printed size of your image will shrink - you can't see the pixels getting closer together so maybe it can help to think of it as the pixels making up the picture getting stacked. So, what you need to do in your image editing or graphics app is set the image resolution 1st, to the desired dpi, then look at the size of the resulting image in inches or cm, & adjust things from there. The standard for a fax is normally about 150 dpi, while a nice graphical chart for your presentation would likely be over 1000 - photos are continuous tone, without the nice sharp edges of your graphs, which is why those graphs need the higher dpi. Photos in your average magazine are 300 dpi - a nicer magazine that's all about the photos might be printed at 600. What's really happening is that what you see on the average PC or laptop screen is about 96 dpi in Windows. When you print something you should be thinking about that box or cube shape - whatever the size of your print, it should be several pixels deep, referred to as dpi, lpi etc. You can spread the magnetic balls out on the table & create a larger rectangle that is only the height of one ball, or you can create a much smaller box or cube shape that is many balls in height. As a way to visualize it you might think of it as a collection of those small magnetic balls that you can put together in whatever shapes, in this case rectangles of different heights or thicknesses. FWIW, please remember that when you're printing something you need enough pixels for the results to look good - lots of people get confused on this point.
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