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04-04-2010, 02:41 PM   #1
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image resolution K7= 72 DPI?

Just wondering, when I was looking at the info of my picture it writes :

- Primaire afbeelding
Fabrikant = PENTAX
Model = PENTAX K-7

Orientatie = Rij 0 bevindt zich aan de visuele bovenkant van het beeld en kolom 0 aan de visuele linkerkant
X-resolutie = 72
Y-resolutie = 72
Resolutie-eenheid = Inches
Software = PENTAX Digital Camera Utility Ver. 4.11
Tijd laatste wijziging = 2010:03:23 22:15:35
Artiest =
YCbCr-positionering = Co-sited
Copyright =
- Exif specifiiek
Belichtingstijd = 1/180 sec [0.006]
F-getal = 18
Belichtingsprogramma = Creatief programma (geneigd tot velddiepte)
ISO snelheidscijfers = 400
Exif-versie = 0221
Oorspronkelijke aanmaaktijd = 2010:03:23 18:06:35
Digitalisatietijd = 2010:03:23 18:06:35
Configuratie componenten = YCbCr
Biaswaarde belichting = -3/10 [-0.300]
Meetmethode = Patroon
Flitsen = Flits werkte, verplicht flitsen
Brandpuntsafstand = 32.50 mm

Is this resolution correct?!?! should this be 72 dpi?
looking at the exif info of a picture created with E500 it reads 314 DPI
Did I put a setting wrong or ....?!?
Please can someone explain what should be the ideal value with K7 and why Olympus gives other info - see below


- Primaire afbeelding
Beschrijving afbeelding = OLYMPUS DIGITAL CAMERA
Fabrikant = OLYMPUS IMAGING CORP.
Model = E-500

Orientatie = Rij 0 bevindt zich aan de visuele bovenkant van het beeld en kolom 0 aan de visuele linkerkant
X-resolutie = 314
Y-resolutie = 314
Resolutie-eenheid = Inches
Software = Version 1.2
Tijd laatste wijziging = 2010:01:03 17:26:45
YCbCr-positionering = Co-sited
- Exif specifiiek
Belichtingstijd = 1/80 sec [0.013]
F-getal = 33/10 [3.300]
Belichtingsprogramma = Creatief programma (geneigd tot velddiepte)
ISO snelheidscijfers = 100
Exif-versie = 0221
Oorspronkelijke aanmaaktijd = 2010:01:03 17:26:45
Digitalisatietijd = 2010:01:03 17:26:45
Configuratie componenten = YCbCr
Biaswaarde belichting = 0
Max. diafragma = 761/256
Meetmethode = Patroon
Lichtbron = onbekend
Flitsen = Flits werkte, automatische modus
Brandpuntsafstand = 38 mm

04-04-2010, 02:47 PM   #2
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The DPI field in the EXIF data is for scanners, not cameras. 72 DPI is filled in as a default for cameras. The pixel density of your K7's sensor is much much greater, somewhere around 6 mpx per square centimeter. The DPI number you see is only meaningful when you print. I'm sure Ira will expand fully on this when he finishes eating. Don't worry -- you don't have a lo-res camera!
04-04-2010, 03:00 PM   #3
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QuoteOriginally posted by RioRico Quote
The DPI field in the EXIF data is for scanners, not cameras. 72 DPI is filled in as a default for cameras. The pixel density of your K7's sensor is much much greater, somewhere around 6 mpx per square centimeter. The DPI number you see is only meaningful when you print. I'm sure Ira will expand fully on this when he finishes eating. Don't worry -- you don't have a lo-res camera!
Just found another article in the forum https://www.pentaxforums.com/forums/post-processing-printing-software-darkroo...-question.html

If this is the case, and there is nothing wrong with my K7 - you can stop replying to this thread ( after confirnation) and sorry I did not found that thread before posting my question
04-05-2010, 05:28 AM   #4
Ira
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Location: Coral Springs, FL
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Posts: 5,216
I just finished eating.

72 dpi at a 5-inch image size is bad.

72 dpi at a 50-inch image size isn't, because divide the 50 by 10, multiply the 72 by 10, and now you have a 5-inch image at 720 dpi.

They default to 72 because that's 1-inch on a monitor. (Yeah, this varies with how your display is set up, but an inch is the rule.)

It's a math thing, and you could have something at a resolution of just 2, but as long as the image size is large enough, it can be resized (without resampling) to an acceptable resolution.

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