September 21, 2004
DPI and digital cameras
Print is such a different world. It's all about DPI. It's all a mystery to me. But I am confident we will work it out.

Heiko, March 2004
Anyone coming across the news/magazine/advertising world is bound to come across a puzzling talk about dpi as a key indicator of the digital images one submits. For the amateur photographer it's confusing at best. Luckily, Gisle comes to the rescue with the Pixel FAQ:
Pixels and derived terms such as ppi/dpi and resolution are probably among the most misunderstood things in digital photography. The major source of confusion is the fact that a ppi field is embedded in the image metadata by most digital cameras. This gives some people the idea that pixels do have size and that print resolution is somehow a basic attribute of the image file. This is, of course, nonsense. Size in inches is not really an attribute of an digital image until it is rendered on some output device, so there is no reason one should attach any meaning to the print resolution embedded in the file. But people do, and get confused.
Q 2: My expensive camera outputs images that is only 72 ppi! How can I increase its resolution?

The ppi-number embedded in the image file by your camera is meaningless. Don't worry about it.
Users of BreezeSoft's Downloader Pro can automatically set the JPEG's dpi to 300 to avoid confusing email exchanges with the printers. If not, read Gisle's FAQ on how to do it lossless in Photoshop.

Update: Cross-posted to Photoblog. More FAQs here.

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twist of sideblog accomplis: DPI and digital cameras (October 4, 2004 03:31 PM)
"DPI and digital cameras..."
Anders Jacobsen's blog: How do I find the dpi of a jpeg? (November 8, 2004 04:54 PM)
"The answer is in Gisle Hannemyr's excellent 'Pixel FAQ': use Photoshop or a similar photo editing tool. In Photoshop, go to the following menu option: Image->Image Size. "

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