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04-21-2009, 02:03 AM   #16
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QuoteOriginally posted by Marc Sabatella Quote
72, just like other Pentax DSLR's. Again, this number is entirely meaningless - it has nothing to do with the actual resolution of the image.
Hi

72 is the default for jpg files. I ment raw files in DNG. It's extracted by default at 240 ? or 300 ? Is there a diferrence between them that matters ?

04-21-2009, 08:17 AM   #17
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RAW, JPEG, doesn't matter. There is a completely meaningless field in the EXIF that all Pentax cameras fill with the number 72, regardless of whether they are writing a JPEG, PEF, or DNG. Once again, it's a meaningless number. Asking if the default resolution of the image is 72, 240, or 300 is like asking if the default speed of a Toyota Corolla is 50, 70, or 100 KPH. A car doesn't have a defualt speed; it's the speed you actually drive it that matters. Similarly, an image from a digital camera doesn't have a resolution in dpi - it has pixels, period. It's the size you print it at that determines dpi.

Last edited by Marc Sabatella; 04-21-2009 at 03:01 PM.
04-21-2009, 09:00 AM   #18
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QuoteOriginally posted by Marc Sabatella Quote
RAW, JPEG, doesn't matter. There is compeltely maningless field in the EXIF that all Pentax fill with the number 72, regardless of whether it is writing a JPEG, PEF, or DNG. Once again, it's a meaningless number. Asking if the default resolution of the image is 72, 240, or 300 is like asking if the default speed of a Toyota Corolla is 50, 70, or 100 KPH. A car doesn't have a defualt speed; it's the speed you actually drive it that matters. Similarly, an image from a digital camera doesn't have a resolution in dpi - it has pixels, period. It's the size you print it at that determines dpi.

I think I understand now.
Let me refrase then, what is the maximum print size that a (raw) image from k20d can be print at 300 dpi ? and at 240 dpi ?
04-21-2009, 01:24 PM   #19
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Some weird calculations :-)

As K20D sensor is 23.4 x 15.6 mm (~0.92" x 0.61") and has 4672 x 3104 effective pixels aka DOTS - so we get that K20D results in superb ~5080 DPI in resolution (he-hee). Meaningless- yes... but with 1:1 real macro lens You can now measure real world in DPI :-)
To netuser: simple math @300DPI it is 4872/300 by 3104/300 = ~16" x 10" and @150DPI it is 32" x 20" (too huge maybe?)
Best and happy DPI, PPI, etc., JR

04-21-2009, 02:07 PM   #20
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Thanks to all
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