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Concern over dpi of images, need some backup feedback

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Nick Montgomery
Concern over dpi of images, need some backup feedback
on Dec 6, 2012 at 3:39:30 am

Fairly confident in my thoughts on this but want to check this with other compositors here just to be safe.

Getting started with a project where I'll be comping background images into green screen footage shot at 2K. I asked the artist to supply me with background images at 4K so that I can resize as needed for close-ups and other manipulations that may be needed. Final comps will be done in 2K.

The suggestion has been made for the artist to deliver 2K background images at 600 dpi so that they may be used and enlarged as needed. From my knowledge, dpi means nothing in AE and therefore will not affect how much an image can be enlarged without losing quality. But if a 600 dpi image is imported (not a project file, a finished image) into Photoshop, for example, can it be enlarged to 4K without quality loss and be good for what I'm doing?

Even then I figured the easiest path was just getting the artist to deliver to me a 4K image from the start.

Nick Montgomery
DP/Editor/Compositor
http://www.merc-media.com


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Angelo Lorenzo
Re: Concern over dpi of images, need some backup feedback
on Dec 6, 2012 at 4:43:52 am

You are correct, DPI means nothing unless you are outputting to a variable resolution output a.k.a. a printer.

DPI is basically a flag in an image and changing it does not change the width x height resolution. What confuses the issue with Photoshop users is that, by default, the image resizing function will allow adjustments to DPI to also affect the pixel count, thus maintaining print size. This can be disabled, but no one seems to bother.

With that said, you are looking purely at pixel resolution. 4K is 4K at any DPI. You should have your background artist work in this width x height resolution and ignore DPI.

Further reading:
http://www.rideau-info.com/photos/mythdpi.html
http://www.danrichard.com/2006/03/23/to-print-or-not-to-print-making-sense-...

--------------------
Angelo Lorenzo

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Vishesh Arora
Re: Concern over dpi of images, need some backup feedback
on Dec 6, 2012 at 7:03:39 am

Nick

Dave has replied to this question earlier with a good explanation. Go through this thread:

http://forums.creativecow.net/thread/2/953078

Vishesh Arora
3D and Motion Graphics Artist
Films Rajendra

Blog:
http://digieffects.wordpress.com

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Tudor "Ted" Jelescu
Re: Concern over dpi of images, need some backup feedback
on Dec 6, 2012 at 7:28:35 am

I agree with Angelo - 4k from the start.

Tudor "Ted" Jelescu
Senior VFX Artist


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