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Old Nov 16, 2004, 7:24 PM   #1
jwt
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I am somewhat confused by pixel counts and print sizes. The Kodak web site claims 20x30 prints from a 5 megapixel camera. Other forums have indicated it takes 5-6 megapixels to get a satisfactory 8x10 print. Can someone help to clarify this for me?

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Old Nov 16, 2004, 9:58 PM   #2
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It is not surprising that you are confused, this is a confusing topic.
That all has to do with dpi. If you lower the dpi far enough and increase the viewing distance far enough you can get just about any size out of a given size image. If it is a good 5mp camera you should be able to get good-great 8x12s(Or at least as good as the film equivalent).

Resolution is usually stated in terms of dpi, but that is a bit of a misnomer. mp is really a measure of size of an image; with poor noise control or a slow or otherwise poor lens it may be much lower. Likewise with good noise reduction and a good lens the resolution can be higher. There is often times a tendancy as megapixels increase for the resolution to actually decline somewhat as more noise and imperfections of a lens to become apparant. YMMV, but take a look at the sample pictures to have an idea of what the camera can do.

Hopefully that is somewhat clear, feel free to ask more questions.
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Old Nov 17, 2004, 9:46 AM   #3
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Kodak is using the print sizes such as the 20x30 as a tie in to Ofoto (their digital printing service). From Ofoto's site, you should be able to get a 20x30 from a 2 MP camera image that has not been cropped

Ofoto's website states:
  • For a 4 x 6" print, the image resolution should be 640 x 480 pixels minimum [/*]
  • For a 5 x 7" print, the image resolution should be 1024 x 768 pixels minimum [/*]
  • For an 8 x 10" print, the image resolution should be 1536 x 1024 pixels minimum [/*]
  • For a 16 x 20" print, the image resolution should be 1600 x 1200 pixels minimum [/*]
  • For a 20 x 30" print, the image resolution should be 1600 x 1200 pixels minimum [/*]
  • For a Wallet-size print, the image resolution should be 320 x 240 pixels minimum
[/*]
and
  • For a 4 x 6" print, your photo should have an aspect ratio of 1:1.5. [/*]
  • For a 5 x 7" print, your photo should have an aspect ratio of 1:1.4. [/*]
  • For an 8 x 10" print, your photo should have an aspect ratio of 1:1.25. [/*]
  • For an 16 x 20" print, your photo should have an aspect ratio of 1:1.25. (same as 8 x 10") [/*]
  • For an 20 x 30" print, your photo should have an aspect ratio of 1:1.5. (same as 4 x 6") [/*]
  • For a Wallet-size print, your photo should have an aspect ratio of 1:1.5. (same as 4 x 6") [/*]
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