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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > iPhone, iPad & iPod > PPI settings for iPhone camera

PPI settings for iPhone camera
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jretzner
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Sep 27, 2015, 12:32 AM
 
The Pixels Per Inch setting of my iPhone 5 is set at 72. How can I increase this to produce higher resolution photos?
     
turtle777
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Sep 27, 2015, 12:48 AM
 
What do photos have to do with UI PPI settings?
I'm confused.

-t
     
subego
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Sep 27, 2015, 01:33 AM
 
I'm confused too.

Originally Posted by jretzner View Post
The Pixels Per Inch setting of my iPhone 5 is set at 72. How can I increase this to produce higher resolution photos?
The pictures are coming off the phone at 72ppi?
     
jretzner  (op)
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Sep 28, 2015, 12:24 AM
 
Photoshop calls it Resolution pixels/inch. Look under Image, go down to Image Size, and Document Size with width and height, plus Resolution (in my case 72). Is that the info needed? If so, how do I increase the resolution (pixels/inch) in my iPhone camera to a higher number, say Resolution of 300 pixels/inch aka PPI or pixels per inch? Thanks!
     
subego
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Sep 28, 2015, 03:15 PM
 
Got it! Resolution can mean different things depending on context.

AFAIK, you can't do what you want directly out of the phone. You have to do it in an external program, like Photoshop. I'm not sure if you can do it in iPhoto/Photos.

This is how you do it in Photoshop CC, it should work in older versions.

You go into "Image Size". Where it gives you "width" and "height", there's a popup menu which lets you select the units the width and height are displayed in. You want to pick "percent". It will be 100% at this point.

Change the ppi to whatever you want.

Changing the ppi will change the percent. If you go from 72 to 300, the percent will now read 24% (edit: I had that flipped, you'd get 24% going from 300 to 72. Going from 72 to 300 will get you 416.67%).

Change the percent back to 100%.

All done!


You should double check where it says Dimensions at the top of the Image Size window before you accept the changes. Those pixel numbers should be the same as what you started with.
( Last edited by subego; Sep 28, 2015 at 03:43 PM. )
     
turtle777
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Oct 2, 2015, 08:43 AM
 
However, This doesn't make the pictures higher resolution.

The iPhone already takes the picture at the highest resolution.

-t
     
subego
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Oct 2, 2015, 12:45 PM
 
Yes and no.

There's "native resolution" and "display resolution".

The latter is variable, the former is not. They both get called "resolution" without the qualifier.
     
jretzner  (op)
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Oct 3, 2015, 12:40 AM
 
Thank you! I've been using Photoshop to increase the resolution to 300, but the percentage is new lingo for me. I'll "play" with it some more on Photoshop to accomplish larger width and height dimension.

Thanks again,

---Jim
     
subego
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Oct 3, 2015, 04:55 PM
 
You are welcome!

Just to clarify my not-so-clear post, you're aiming for dimensions to be exactly the same as what you started with. Photoshop considers the dimensions the actual number of pixels you have across and down. You don't want to add any pixels or take any away, only alter how many make up an inch.

The alterations go on in the width and height section.

If I'm not explaining this very well, I gladly whip up some pics.
     
jretzner  (op)
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Oct 5, 2015, 12:18 AM
 
Thanks. We are on the same page.

Jim
     
   
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