DPI (dots per inch) is printer resolution property. This dimension is used in software that communicate directly with printing device.
PPI (pixels per inch) is screen display resolution property. This dimension is used in photo edition software that prepare the image to send to print through the printer driver software.
Therefor enlarge the image to the resolution as you wish using the percentage scale and save the file or change the PPI resolution value and send the image to print.
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