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Old 08-19-2005, 01:00 PM   #1
raphaelgandara
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Default Size problem.

Hey everyone.

I'm doing a magazine and a 2-page spread of it measures 42cm x 28xm (w x h).

I have a photo which its size in 300 dpi's contains 26cm x 16cm. I'd like to know how can I extend the original image to become a 2-page spread still having their 300dpi's and not being low-res.

Sorry about the terms, but I'm not from US.

Thanks a lot,

Raphael
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Old 08-19-2005, 02:21 PM   #2
PeterArnel
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THe problem is that when the pic is scanned at 300dpi and then enlarged - u decrease the number of dpi - I am in the UK the old rule of thumbs is that if the image is enlarged over 130% then u get problems - HOWEVER when needs must and u just enlarge it - and then it really is all about content of the pic. Usually only the photographer complains everybody else sees the pic for what it is - which is composition and content.
Peter
Unfortunatly there is only one solution if it matters that much - and that is to machine proof it - but unless you have a friendly printer that can be expensive - or perhaps just talk to your printer who may have examples of images that have been enlarged to show u the result -
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Old 08-19-2005, 03:20 PM   #3
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Check with the printer. Often they can produce acceptable 133 line halftones with 200 dpi. (1.5 x lpi). If this is the case, your images are 39 x 24 cm, and you have to enlarge only a small bit more to reach the full size (ask the printer how much bleed you will need, unless that is already figured into the page dimensions you gave us.)

Don McCahill
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Old 08-20-2005, 04:16 AM   #4
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If resizing a image with Photoshop (Not sure what software your using), why not try the 110% resize trick?

Resize to 110% a couple of times, instead of resizing in one go. Failing that you could try this free PS 110% scaling action . http://www.interpolatethis.com/actions.html Seems to work quite nicely.

   
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Old 08-20-2005, 12:23 PM   #5
raphaelgandara
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Yeah, I'm using Photoshop.
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Old 08-20-2005, 01:18 PM   #6
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Don - do many use 133 screen - that used to be the top letterpress screen - certainly in the UK most are now on 175# - sheet fed printers are moving up to 200#
Peter
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Old 08-21-2005, 02:09 PM   #7
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I stand corrected then. My background is newspapers, where 133 is a dream.

Don McCahill
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Old 08-24-2005, 03:21 PM   #8
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There's a couple more actions here.

This one for Photoshop CS.
http://www.thelightsrightstudio.com/...zerForPSCS.htm

And this one for Photoshop 7.
http://www.thelightsrightstudio.com/...izerForPS7.htm

Hope someone finds them useful.

   
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Old 08-24-2005, 05:50 PM   #9
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You can resample in Photoshop, but it's impossible to add information. If you enlarge the image, something will probably suffer.

You're better off to have the image rescanned if possible. If not, you will have to live with whatever degradation of the image occurs as a result of scaling.
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Old 08-26-2005, 02:14 AM   #10
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Raphael, as others have said, if you don't have enough pixels to start with, any up-ressing will inevitably lead to some deterioration. You need a big jump to go from 26-42 cms! However, it may take a trained eye and a very polished print to tell that much difference: the average magazine reader is not nearly as picky as the photographer, generally!

I have used Qimage Pro (from DDI Software) to upsample images very successfully (though not by as much as you are suggesting) - if you do a lot of digital printing, it is well worth buying anyway - one purchase, and lifetime support (I don't know how old the author, Mike Chaney, is though!) It is a tremendously useful program, I find (PC only though).
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