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DPChallenge Forums >> Tips, Tricks, and Q&A >> Upsizing files for larger prints?
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03/23/2005 04:06:38 PM · #1
I read an article in "Digital Photo Pro" magazine this month about upsizing digital files for making larger prints. Their claim was that you could safely upsize a 6 megapixel file to make prints as high as 24" wide, trusting the interpolation to retain 300dpi quality. With no interpolation or "added" pixels, you could only make a print of about 10x7 at 300dpi from a 6MP file. So I am just a little confused. Is it safe to "upsize" files and print a 24" photo from a 6MP camera file? Or will be a noticeable reduction in quality, or does that only come beyond about 24"? Any insight would be much appreciated.
03/23/2005 04:12:02 PM · #2
I have a hard time trying to determine the aspect ratios of my pictures, and also on how much can I resize it to fit the quality standards.
Getting the aspect ratio is quite simple, but making it fit the ratios for DPCprints, for example. Some of the files I've uploaded, have diff crops from the one entered in challenges for example, cz they don't match any of the "sizes" for DPCprints.

Either I'm missing a small point on how to do it well, or I'm just dumb.......heheh
03/23/2005 04:22:59 PM · #3
It can be a bit tricky. Some similar conversation in this recent thread.
03/23/2005 04:27:03 PM · #4
I should hope a 6MP can do a 24" print.

These are DPCPrints from my 3.7MP camera as an example, all at 300DPI:

16" x 20" ' . substr('//images.dpchallenge.com/images_challenge/309/thumb/147015.jpg', strrpos('//images.dpchallenge.com/images_challenge/309/thumb/147015.jpg', '/') + 1) . '

16" x 24" ' . substr('//images.dpchallenge.com/images_challenge/294/thumb/132426.jpg', strrpos('//images.dpchallenge.com/images_challenge/294/thumb/132426.jpg', '/') + 1) . '

20" x 30" ' . substr('//images.dpchallenge.com/images_challenge/296/thumb/133060.jpg', strrpos('//images.dpchallenge.com/images_challenge/296/thumb/133060.jpg', '/') + 1) . '

They were all upsized from an original of 2240x1680, in small increments, occasionally applying USM on the lightness channel, and after final dimensions, close and careful manual blurring tool applied lightly, up close to edges where "jaggies" would show up.
Very time-consuming, but the prints I have in hand are very clear, even close-up.

Message edited by author 2005-03-23 17:13:59.
03/23/2005 04:32:04 PM · #5
This article does a reasonable job explaining resizing and resampling and also mentions a few options to try and retain as much quality as possible. Personally I use Genuine Fractals. Hope this helps.
03/23/2005 04:33:23 PM · #6
Originally posted by ngremour:

I read an article in "Digital Photo Pro" magazine this month about upsizing digital files for making larger prints. Their claim was that you could safely upsize a 6 megapixel file to make prints as high as 24" wide, trusting the interpolation to retain 300dpi quality. With no interpolation or "added" pixels, you could only make a print of about 10x7 at 300dpi from a 6MP file. So I am just a little confused. Is it safe to "upsize" files and print a 24" photo from a 6MP camera file? Or will be a noticeable reduction in quality, or does that only come beyond about 24"? Any insight would be much appreciated.

You don't have to have 300 dpi to make a good print. Sometimes as little as 150 dpi, or less, will print out fine. It depends a lot on the subject matter of the image, and the methods for upsizing and printing that you use, among other things. Step interpolation is considered superior to making a large increase all at once. A program called Genuine Fractals is the choice of many pros for upsizing. Another factor to consider is viewing distance for the final version. Are viewers going to be looking very closely, or from across a room? Think about how much upsizing it takes to put a photo onto a billboard and you'll realize that there are no limits on what can be done if you need really large prints and can afford what it takes to get there.
03/23/2005 04:45:44 PM · #7
Originally posted by dan_pendleton:

This article does a reasonable job explaining resizing and resampling and also mentions a few options to try and retain as much quality as possible. Personally I use Genuine Fractals. Hope this helps.


Not exactly inexpensive (Genuine Fractals) is it? I've heard about this a couple of times recently so I went to inquire about purchasing. Priced at $160 - $300 depending on regular of pro versions. Hmmm...may to wait a bit on it.
03/23/2005 04:56:21 PM · #8
There is also a tutorial on DPChallenge that discusses resampling.
03/23/2005 05:03:09 PM · #9
Originally posted by glad2badad:


Not exactly inexpensive (Genuine Fractals) is it? I've heard about this a couple of times recently so I went to inquire about purchasing. Priced at $160 - $300 depending on regular of pro versions. Hmmm...may to wait a bit on it.


No, not cheap but I do like it. Many people feel Stair Interpolation is just as good. Have a look at Fred Miranda's SIPro for $20 as a Photoshop Plug-In. I haven't used that one but do use a few of Fred's other actions, they are top-notch.
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