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FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
Thread started 27 May 2008 (Tuesday) 10:28
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Image up and downsizing

 
shutter_blitz
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May 27, 2008 10:28 |  #1

I was going through Scott kelby's book on PS CS3 and in it he explains how resolution of images can be changed to increase the quality of upsized and downsized images, for example for printing poster size images.

Before this I knew that images from a rebel xt can printed to a max size of around an A4 paper w/o losing resolution.

From what Kelby says (since he doesn't explicitly restrict his method to a camera model/brand or a max resolution limit) any sized image can be printed to a poster size by manipulating the ppi and image size accordingly in PS and maintaining its original quality.

Anyone care to weigh in on this?


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TheHoff
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May 27, 2008 10:37 |  #2

"Maintaining its original quality in regards to what the human eye can discern from a poster size print at a reasonable viewing distance" would probably be the full explanation. There is no way it will retain absolute original quality; otherwise we'd all shoot 2MP cameras and up-res. The program's algorithm (Photoshop, or any of the plugins) cannot put data back where it never existed, they can only guess at what the missing pixels might have been.


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shutter_blitz
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May 27, 2008 10:54 |  #3

Thats what I thought.
So where's the cut off point? Given this: "Maintaining its original quality in regards to what the human eye can discern from a poster size print at a reasonable viewing distance" I can upsize my rebel's images well past an A4 size print. The resolution on rebel's images should allow upto poster size images that Kelby talks about.


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Canon 50D
EF 50mm f1.4 USM, EF 70-200mm f/2.8 L IS USM
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Quantaray QSX-9500

  
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TheHoff
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May 27, 2008 11:02 as a reply to  @ shutter_blitz's post |  #4

There are no hard and fast rules because it depends on two subjective or at least variable points: viewing distance from the print and the level of your eyesight. If I have 20/20 but you require glasses, I'm probably going to be pickier about a print from a given distance.

Also if you're mounting your Rebel-generated up-res'ed poster 20 feet away, you could hardly find a fault with it. So the original author's quote is accurate it just leaves the variables up to you to determine whether a print is acceptable at a certain size.


••Vancouver Wedding Photographer  (external link)••| [gear list] | Latest blog: 5 steps to stopping image loss (external link)

  
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shutter_blitz
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May 27, 2008 11:22 |  #5

k,thx.


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Image up and downsizing
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