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Enlargement Photoshop

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  #1  
Old 05-02-2016, 05:24 PM
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alreese83 alreese83 is offline
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Enlargement Photoshop

Hi,

I need to enlarge a photo from 5x7 to 20x30, do I retouch before or after I resize it? Best practices resources (book, link, etc.)?

Thanks,
-ar
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  #2  
Old 05-02-2016, 08:44 PM
skoobey skoobey is offline
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Re: Enlargement Photoshop

After if you're looking for maximum quality, and you only resize on export.

Before if you want to have less work, but you loose all the pixels.
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Old 05-03-2016, 10:15 AM
Shoku Shoku is offline
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Re: Enlargement Photoshop

That is an enlargement bigger than 150% which is the max recommend before you begin losing detail. PS isn't the best at doing this, but it can be done with acceptable results. There are different approaches. If stuck with PS I usually enlarge 150% with Bicubic , then enlarge at 10% increments using Bicubic Smoother. But it all depends on how critical it is.
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Old 05-03-2016, 11:14 AM
skoobey skoobey is offline
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Re: Enlargement Photoshop

My answer was actually there for reduction But, still, you want to change size at the end, as any increase in dimensions blurs softens the image.
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Old 05-03-2016, 02:50 PM
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Tony W Tony W is offline
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Re: Enlargement Photoshop

Quote:
Originally Posted by alreese83 View Post
Hi,

I need to enlarge a photo from 5x7 to 20x30, do I retouch before or after I resize it? Best practices resources (book, link, etc.)?

Thanks,
-ar
You should really retouch at the finished size (or even larger) if you want to make sure that you have effectively hidden your retouching. The assumption here is that you are talking about a 5"x7" print not a negative or transparency

The quality of the final image will depend on the quality of your original and scanners capability to resolve detail.

Reflective material (print) on a scanner: most will not resolve anything more than 600 spi.

But setting your 7x5 to the scan @r 48 bit @ 1200 spi will yield a file size of 8400 x 6000 pixels which will yield a print of 28" x 20" sending 300 ppi for printer (Canon/HP) close enough to your required size. Retouching at 100% zoom on this file is like working on a 3x size image therefore if you cannot see your working here it is unlikely that anyone else will when looking at the print.

IMO resizing in PS is mostly as good as any third party application from PS CS5 onwards. It is not recommended these days to use step by step resizing as according to Eric Chan this is more likely to introduce artifacting than going straight to the finished size
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Old 05-03-2016, 02:50 PM
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Re: Enlargement Photoshop

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Originally Posted by skoobey View Post
After if you're looking for maximum quality, and you only resize on export.
Before if you want to have less work, but you loose all the pixels.
Do that, you're in for some surprises and more 'retouching' after the resample. So for the OP, I'd do the opposite.
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Old 05-03-2016, 02:57 PM
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andrewrodney andrewrodney is offline
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Re: Enlargement Photoshop

Quote:
Originally Posted by alreese83 View Post
Hi,

I need to enlarge a photo from 5x7 to 20x30, do I retouch before or after I resize it? Best practices resources (book, link, etc.)?
-ar
http://www.amazon.com/Digital-Print-.../dp/0321908457
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Old 05-04-2016, 12:30 AM
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Repairman Repairman is offline
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Re: Enlargement Photoshop

Enlarge first. Enlargement may reveal details of the picture that need a little work before output. Retouching tell tale signs like brush marks, grain/noise additions, comping edges etc will be less visible if left unmagnified.
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Old 05-04-2016, 10:00 AM
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alreese83 alreese83 is offline
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Re: Enlargement Photoshop

Yes, it is a print that was scanned at 600, so there is grain...a lot. No, I do not have access to the RAW file, and I am not printing it myself. It is a wedding portrait, that's going to be softened in various places. Thanks for all of the advice / tips, will work according to. But what is SPI?
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Old 05-04-2016, 10:02 AM
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alreese83 alreese83 is offline
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Re: Enlargement Photoshop

And I am using PS CC 2014
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