6720 X 4480

[Danny Hosford]

Thisis not a new term to me because I have worked in the world of digital imaging and computer graphics for decades. But I find a lot of people really miss the point about what PPI means and how that relates to image resolution.

If you compare that Canon 5D Mark IV with its 6720 x 4480 pixel images, to a Canon Rebel T3i which creates 5184 x 3456 pixel images, you would see that the T3i creates slightly lower resolution images.

SO, PPI is just really only relevant when we are talking about printing. For most printing purposes either 240 PPI or 300PPI is quite good and sufficient. If you print at any higher PPI, you would have a hard time discerning the difference.

Lots of people talk about creating digital images that are to be displayed on a computer screen with specifications that the image needs to be 72PPI. (I see this ALL the time.) When displaying a digital image on the computer screen, really ALL that matters is the number of pixels in the image. PPI is really not relevant. A 1000 pixel wide image displayed on your computer will appear as 1000 pixels wide, regardless of what PPI setting might be embedded in the file The PPI value is only useful for printing to know how to scale the print.

If you say you want an image that will print at 300PPI and say that you need it to be printed at 20 inches wide, then that would tell me how much resolution that is needed. 300PPI x 20 inches = 6000 pixels. So I would need an image that is at least 6000 pixels wide. I simply MUST know how you are going to use the image and how big you are wanting to print it. Just telling me a PPI number is really insufficient.

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