Printer setup error.
A small change in printer settings may be the "behind-the-scenes" of your photo reduction. Page size, orientation, scale, etc. May be the "culprit". When printing, be sure to check the settings to ensure that the page size exactly matches the photo size. Don't forget to turn on the "adaptive size" function to keep the photos as they are!
The photo resolution is not enough.
Low-resolution photos are like bodies without souls. In order to maintain high quality, the printer will automatically reduce the photos. Before printing, make sure that the resolution of the photo is at least 300dpi, so as to make the photo full of vitality and avoid the embarrassment of being "slimmed down".
Software settings are "destructive"
Your usual image processing software may be quietly reducing your photos. Go deep into the software settings, find and disable the zoom function, so that the photos will remain the same when printed.
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1 Check the printer settings to make the page exactly match the photo size. 2. Improve the photo resolution and print quality by going up a flight of stairs. 3. Adjust the software settings, disable the zoom function, and protect the original photos. If all the above methods fail, you may wish to contact the printer manufacturer or technicians for more "emergency" suggestions!