DPChallenge: A Digital Photography Contest You are not logged in. (log in or register) 
 

DPChallenge Forums >> Hardware and Software >> 30D........72dpi?
Pages:  
Showing posts 1 - 12 of 12, (reverse)
AuthorThread
 07/09/2007 10:58:58 AM · #1
Am I missing something obvious?
My 30D pictures all say there are only 72dpi.
My Rebel pictures were 180dpi.

Am I not making the most of the camera or am I just mis-understanding the whole dpi/picture size thing?

thanks (for probably making me feel foolish with an answer!!!!)
 07/09/2007 11:04:11 AM · #2
Originally posted by UNCLEBRO:
...am I just mis-understanding the whole dpi/picture size thing?


Yes. I thought ALL digital cameras shot at 72dpi by default. However, that has no bearing on the resolution... the same image could be 72dpi, 100dpi, or 1000dpi, all with the same file size, and only the physical dimensions of the image would change. If you scale 72dpi images from the 30D to 180dpi while maintaining the file size, you'll get a larger image than a Rebel 300D because the 30D has a higher resolution. 6" x 4" at 180dpi = 15" x 10" at 72dpi, etc. (you're only changing the density of the pixels, not the number).

Message edited by author 2007-07-09 11:06:47.
 07/09/2007 11:07:13 AM · #3
the odd part is the 180dpi

I've had many digital cameras and photoshop has always showed the image size as 72dpi (as a default, it can be changed as Shannon has explained)

Originally posted by UNCLEBRO:
Am I missing something obvious?
My 30D pictures all say there are only 72dpi.
My Rebel pictures were 180dpi.

Am I not making the most of the camera or am I just mis-understanding the whole dpi/picture size thing?

thanks (for probably making me feel foolish with an answer!!!!)
07/09/2007 11:16:55 AM · #4
Originally posted by hopper:
the odd part is the 180dpi

I've had many digital cameras and photoshop has always showed the image size as 72dpi (as a default, it can be changed as Shannon has explained)



Thanks Shannon.

And I just checked old unedited pictures from my Rebel and they definitely say 180 dpi.
 07/09/2007 11:19:08 AM · #5
Originally posted by hopper:
the odd part is the 180dpi

I've had many digital cameras and photoshop has always showed the image size as 72dpi (as a default, it can be changed as Shannon has explained)


Both my point-n-shooters showed default 180 dpi. I think they are set that way because factory assumes files from these cams will go straight to a commercial processor for prints, and 180 dpi is a reasonable resolution for consumer printing at walmart and such.

My 20D defaults to 72 dpi, which is nominal computer screen resolution.

R.
 07/09/2007 11:21:11 AM · #6
Originally posted by Bear_Music:
...factory assumes files from these cams will go straight to a commercial processor for prints, and 180 dpi is a reasonable resolution for consumer printing at walmart and such.


That makes sense! It would also be a good resolution for inkjet prints. I just checked an old 300D file and got the same thing.
 07/09/2007 11:23:02 AM · #7
It wouldn't matter what the resolution was for a color lab print. Those systems simply change the dimensions of the file to the print size, and then resample them down to the preferred resolution for the system. The will not resample UP though...
 07/09/2007 11:29:35 AM · #8
Originally posted by scalvert:
I just checked an old 300D file and got the same thing.


maybe i'm wrong (nah, that can't be true)

:)

i'll check mine when i get home
 07/09/2007 11:33:03 AM · #9
The original on this one is 180dpi.

07/09/2007 11:35:48 AM · #10
and yet, just under 2 total carats ... where's the justice?

:)

Originally posted by scalvert:
The original on this one is 180dpi.

07/09/2007 11:37:08 AM · #11
Originally posted by hopper:
and yet, just under 2 total carats ... where's the justice?


I believe you had a GREAT resolution on that one, no? ;-)
 07/09/2007 11:44:53 AM · #12
indeed ... I resolved to let my new wife help finish paying it off after we were married

:)

Originally posted by scalvert:
Originally posted by hopper:
and yet, just under 2 total carats ... where's the justice?


I believe you had a GREAT resolution on that one, no? ;-)
Pages:  
Current Server Time: 12/31/2025 05:35:52 PM

Please log in or register to post to the forums.


Home - Challenges - Community - League - Photos - Cameras - Lenses - Learn - Help - Terms of Use - Privacy - Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 12/31/2025 05:35:52 PM EST.