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Old Apr 23, 2004, 10:54 AM   #1
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Default How to calculate MP to Print size

I know you get the megapixel by multiplying width x height. How do you calculate what size prints you can make. I have 8mp pictures. How big can I print this without losing quality? Assuming I don't crop it.
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Old Apr 23, 2004, 11:24 AM   #2
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You divide the x and y axis length in pixels of your image by the printer resolution that you want to use. I print using 300 dpi and I find that looks ok. Some people use 150.

As my uncropped images are 3000 x 2000 pixels that means I can print up to about 10 inches by 7 inches, but to save some money I'm starting to use A5....

Regards,
Graham.
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Old Apr 23, 2004, 12:45 PM   #3
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I appreciate your answer. I'm not sure I understand how you get 300dpi. the Canon I-9900 for instance is 4800x2400 dpi. Canon says you can do a 16x20 inch print with a 8mp camera. However, they read this number from a book, and don't know how the number is calculated. It would stand to reason that at 4800x2400 you would have 11.5 million dpi. Please let me know what aspect I am not taking into consideration.

thx,
J
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Old Apr 23, 2004, 2:43 PM   #4
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when your printer does 4800 x 2400 and you want to print with 300 dpi, this printer can do 16x8 inch as far as I know.

4800 : 300 = 16
2400 : 300 = 8
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Old Apr 23, 2004, 3:13 PM   #5
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Some guidlines for print size/resolution submissions can be found at the Digital Image Submission Criteria(DISC) site.

They also have the forming guidlines for required submission METAdata and a Phososhop addin to assist filling it in.
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