jeffscholl
Key Veteran
Location: Whitefish, MT
| A good book for the nitty gritty is David Blatner's Real World Photoshop.
Good information for printer dpi's, monitor calibration, color profiles etc...
72 dpi was a mac standard for a long time, so for instance if you created a new document on the monitor that was 72 pixels long and put a ruler up to the screen it would be one inch in length.
Now on the newer cards/CRT's that can display 2048x1536 on 21" your 1 inch image may be over 100 pixels in length. Now take an LCD front projector that can display 1280x1024 on a 80". The inherent dpi is now quite a bit lower :-) For the most part this is all trivial except when trying to standardize font sizes.
In a nutshell just think of dpi when dealing with scanners and prints.
As far as digital displays (monitor) a pixel is a pixel is a pixel.
One way to demonstrate this is to take an image and save it as the same pixel demensions but different dpi. What you will find is a 300x400pixel image at 1dpi has the same file size as a 300x400image at 300dpi. However, if you could hit print with a monster spool printer, one image would look awesome and come out as 1" x 1.3", but the other would look absolutely cruddy but come out as 300" x 400". Ballpark dpi's are 150dpi for newspaper printers, 300dpi for magazines, and 600dpi for the killer post productions.
The 240dpi you saw from my gravityshots image is a default setting I use in Adobe Capture and Capture C1 Pro for Canon CRW and Nikon NEF raw files.
Cheers,
Jeff |
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