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I wouldn't worry about the DPI figure until you print.The DPI figure is actually not related to the number of pixels that the camera is capturing. I think the Pentax defaults to 72 dpi no matter what resolution you pick.

The DPI figure is also essentially meaningless until you decide to print. If you were to print a 6 megapixel image at 72 dpi, the long side of the print would measure (3000/72) 41.6 inches! Here's the steps I taken when I want to print a picture:
1. Decide how larger I want the print to be
2. Resize the image (change the number of pixels) to correspond to the size I choose in step 1 at approximately 300dpi. (For example, If I choose 8x12 inches in step 1, I resize the image to 2400 x 3600 pixels).
3. Change the DPI from 72 to 300
4. Print

300 is generally considered the optimum dpi for printing although many people like the results they get at DPI's as low as 180.

P.S. You may have gotten a quicker response or more responses if you had posted in the Cameras category

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