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D50 question about .dpi variation

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SLR Dude

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Old school Nikon SLR Dude here, new to D-SLRs.

My question is simple:

Why is the resolution of JPGs produced by the D50 at 300 dpi, while the resolution of RAW images is 240?

And the follow up is:

Is it possible to adjust the DPI the D50 takes images in within the camera?

Thanks,
SLR Dude
 
That's not the issue.

With the D-50 on FINE JPG setting and LARGE image size it produces a 300dpi image. Whereas shooting RAW with LARGE image size it produces 240dpi.

Internally The D-SLRs use the sensor's RAW data to come up with the JPG, so I can't understand how the JPG could have a higher DPI (or resolution) than the RAW file. Especially when both images have the same image size of 3005x2000 pixels.

The end result is at FINE LARGE JPG settings the D-50 produces smaller, but higher quality prints than the RAW data externally converted to JPG on a PC.
 
You're correct.

And both the RAW and large, fine JPG produce roughly 3005x2000 images. However, with different resolutions of 240 and 300dpi, they produce different sized images and at different qualities when printed.

I'm sure this has been brought up before.
 
I know the difference between 240 and 300dpi is extreemely negligible and argueably unnoticeable.

But that still doesn't explain the technical differences.

That's what I was looking for, some logical explaination to this paradox.
 
I understand that. Again, I'm just interested in the reason for the variation. And a variation that seems counter-intuitive at that.
 
SLR Dude said:
I know the difference between 240 and 300dpi is extreemely
negligible and argueably unnoticeable.

But that still doesn't explain the technical differences.

That's what I was looking for, some logical explaination to this
paradox.
Click to expand...
First cameras do not produce "DPI" dots per inch. Only printers produce DPI. You need to do a little research. Cameras do not care about "PPI", pixels per inch. They only produce images with x pixels wide by x pixels high which has no area dimension. Monitors display images in PPI but this is simply an arbitrary figure based on the software used to display the image. PPI means absolutely nothing about the size or quality of your image. The number of pixels in the overall image is all that matters. So look at how many pixels in the image not at how many PPI your computer software decides to display. 3008 pixels x 2000 pixels is the same if displayed at 240 PPI or 300PPI.

CaseyJ
 
you are processing your RAW images in Photoshop ACR arn't you?

The default dpi setting that Adobe uses out of the box is 240 but you can change that to anything you want. The Raw processor still produces a 3008x2000 pixel image, same as the jpeg out of camera. If you process a RAW file using Nikon Capture, you will end up with a jpeg with 3008x2000 pixel file 300dpi resolution tag.

The 300 dpi or 240 or 72 dpi is only a flag that is embedded in the file that print engines look at when it comes to sizing the image when it is sent to the printer. If you change the DPI setting without using interpolation the image quality will not change as you are not adding or removing pixels, all you are doing is changing the native print size.

--
http://www.flickr.com/photos/k-blad/
 
What I am looking at is the metadata displayed in Adobe Bridge and Photoshop for a RAW image versus a fine, large JPG taken on a D-50.

If you change nothing and you print the JPG out, it will print smaller but with slightly higher resolution then a RAW (converted into a JPG on the PC).

What I'm looking for is a reason for this discrepency.
 
Thanks Brad, you answered the question exactly.

I should have mentioned earlier I was using PS.

Thanks again.
 
You would not believe me ...it means nothing....both photos are 3008 X 2000 pixels per inch ,they will print at Identical sizes. If you wish to print them at 250 dpi they will print at 8.3 X 12.5 where if you print them at 300dpi they will print at 6.6 X 10. Its up to you what resolution you want them printed.
--
------------------------------------------------------------
Gene
From Western PA.

Panasonic FZ 20 and FZ30
D50 and lenses.

http://imageevent.com/grc6



Just trying to learn and it's slow going!
 
I wish there was an edit button... its not 3008 X 2000 ppi its just 3000 X 2000 pixels
--
------------------------------------------------------------
Gene
From Western PA.

Panasonic FZ 20 and FZ30
D50 and lenses.

http://imageevent.com/grc6



Just trying to learn and it's slow going!
 
If you are doing your own printing on an inkjet, you should have a look at Qimage. It is the best thing I have found for printing and it has teh best interpolation algorithms around.

Qimage interpolates and adjusts and crops images automatically (or manually if you want) to get best print quality from the given file at a given print size and makes the 240 or 300 dpi tag irrelevant.

That means you dont need to resize the image file in photoshop if you want say an A3, 8x10 or a 3x5 print. The prints look better than prints from the Photoshop print engine, particularly if you print large, due to the superior interpolation algorithms

--
http://www.flickr.com/photos/k-blad/
 
That's Brad, I'll look in to that.

I do my everyday printing on an inkjet photo printer and send the more important stuff to be printed on a local professional system.
 
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