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FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
Thread started 21 Aug 2010 (Saturday) 11:45
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Resize in LR or CS?

 
hania
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Aug 21, 2010 11:45 |  #1

I use a printing company which asks for 402ppi and sizes up to 12 x 18 in.

Am I better resizing in LR (on export to CS3), or while in CS3 or doesn't it matter.

I work in raw and tend to export in PSD.

Many thanks in advance


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tonylong
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Aug 21, 2010 16:56 |  #2

Well, offhand I's say that's a pretty odd request -- I've never heard of a printer asking for 402 ppi. In fact most printers will take any resolution of a reasonable degree, although some commercial printers are known to specify 300 ppi or 360 ppi for the convenience of not having to size things themselves.

So, what outfit is this?

But I'd try to get more info from the printers -- for example, a 12x18 inch print at 402 ppi would come out to 4824x7236 pixels -- are they really saying you need to give them an image at those dimensions?

If so, you can do the resizing easily either in Lightroom or Photoshop -- all you have to do is use the Lightroom Export dialog or the Photoshop Image/Image Size dialog to resize to either the dimension in pixels or use Inches and enter the ppi figure.

When you do an enlargment like this you will also want to consider sharpening. Lightroom has an Output Sharpening function built into the Export dialog and you can try it set to print and see how it comes out. In Photoshop you would want to sharpen after resizing. You should know, though, that images that are sharpened optimized for large prints may look a bit overdone when viewed on-screen.

Seriously, I'd do some test/proof runs with this outfit before ordering large prints. Have some 5x7 or 8x10 samples printed of smaller cropped areas that you can view and judge the print quality with. The idea of springing for 12x18 prints just to be disappointed is not pleasant...


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hania
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Aug 22, 2010 14:05 |  #3

tonylong wrote in post #10763264 (external link)
Well, offhand I's say that's a pretty odd request -- I've never heard of a printer asking for 402 ppi. In fact most printers will take any resolution of a reasonable degree, although some commercial printers are known to specify 300 ppi or 360 ppi for the convenience of not having to size things themselves.

So, what outfit is this?

But I'd try to get more info from the printers -- for example, a 12x18 inch print at 402 ppi would come out to 4824x7236 pixels -- are they really saying you need to give them an image at those dimensions?

If so, you can do the resizing easily either in Lightroom or Photoshop -- all you have to do is use the Lightroom Export dialog or the Photoshop Image/Image Size dialog to resize to either the dimension in pixels or use Inches and enter the ppi figure.

When you do an enlargment like this you will also want to consider sharpening. Lightroom has an Output Sharpening function built into the Export dialog and you can try it set to print and see how it comes out. In Photoshop you would want to sharpen after resizing. You should know, though, that images that are sharpened optimized for large prints may look a bit overdone when viewed on-screen.

Seriously, I'd do some test/proof runs with this outfit before ordering large prints. Have some 5x7 or 8x10 samples printed of smaller cropped areas that you can view and judge the print quality with. The idea of springing for 12x18 prints just to be disappointed is not pleasant...



They are proamimaging.co.uk and I have been using them for 2 years (as have other members of my camera club).

The prints they produce are of exhibition quality - and cost in the region of £1.50 for a 12x18 inch print.
The reason the prints are so cheap is that you do most of the work: convert to their printer profile, and put into folders of the relevant size and type (gloss or satin)

If you forget to resize you end up with a 5x7 on 12x18 paper. :)

I have used both the above methods of resizing and was just wondering if one had any advantage over the other.

I usually export from LR longest edge 18in and then decide later in PS as to the final size.


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Heath
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Aug 22, 2010 14:41 |  #4

This seems to explain why they ask for 402ppi.

http://forum.proamimag​ing.com/viewtopic.php?​t=9939 (external link)


Heath
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Resize in LR or CS?
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