Help with Resolution and dpi Settings

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Submitted By: LJGinn

Joined: Apr 4 2007

Posts:

Help with Resolution and dpi Settings

Posted: April 4, 2007 - 5:19pm

I was using a Canon 10D which has a resolution of 180dpi showing up in Photoshop. I recently got a Canon 1Ds Mark II and Photoshop shows a resolution of 72dpi. In some of the literature I found that the 1Ds MkII lists a 300dpi. How is the dpi set in the camera. Not sure I understand the Large JPEG resolution setting. Files are 4992 X 3328 but the dpi is set to 72. Am I missing something?
Appreciate any help.. Thanks

Submitted By: Larry Berman

Location: Pittsburgh

Joined: Mar 7 2005

Posts:

Re: Help with Resolution and dpi Settings

Posted: April 4, 2007 - 7:48pm

It's PPI (pixels per inch) not DPI which refers to the amount of ink put down on paper by a printer.

Digital cameras do not capture PPI, they only capture actual pixels in height and width. The PPI is a function of the manufacturer's EXIF data which Photoshop reads upon opening the image. You can change it to 300 by unchecking resample and save it. Make sure to never overwrite the original file.

Submitted By: LJGinn

Joined: Apr 4 2007

Posts:

Re: Help with Resolution and dpi Settings

Posted: April 5, 2007 - 7:58am

Thanks. That makes more sense now. I will try your suggestions. If I save as you suggested to say 300, will my printed photo have a better quality? Or is it just relative to squeezing any file onto a certain size paper?

Lonnie Ginn

Submitted By: Larry Berman

Location: Pittsburgh

Joined: Mar 7 2005

Posts:

Re: Help with Resolution and dpi Settings

Posted: April 5, 2007 - 2:31pm

Without changing the size or resolution, do all your cropping and color correction and save as your master file. Then resize resolution and pixel dimensions based on how the image is to be used. 300PPI is a good resolution for most any use except the web. Think image size in pixels. For example, an 8x10 would be 2400x3000 pixels at 300PPI.