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General photography questions and answers: Discuss Upsizing images...I have some RAW images from my D50 (6MP) that I would like to increase in size to make some ...
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Old 27-09-2007, 14:17   #1 (permalink)
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Upsizing images

I have some RAW images from my D50 (6MP) that I would like to increase in size to make some 20x16inch prints. What's the best approach (I am using Photoshop CS3)

1) Image resize using the 10% at a time method
2) Enter the required size in the Crop tool
3) Increase the size in the RAW converter (if that's possible)
4) some other method
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Old 27-09-2007, 14:32   #2 (permalink)
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Re: Upsizing images

You can just about get away with making 20x16 prints from a 6MP image without resampling, provided you view from a reasonable distance.

Ideally you want about 200 dpi for a typical desktop photo printer, so 20" needs about 4000 pixels.

You can use the bicubic resampling method in PS or other editors, but the best software is often reckoned to be Genuine Fractals.

I hope someone else will come up with other/better suggestions.

Last edited by Angela; 27-09-2007 at 15:50. Reason: pm sent to Silkstone
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Old 27-09-2007, 15:49   #3 (permalink)
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Re: Upsizing images

Quote:
Originally Posted by silkstone View Post
Ideally you want about 200 dpi for a typical desktop photo printer, so 20" needs about 4000 pixels.
I was thinking of using Peak Imaging, and their criteria is 254ppi, which equates to an 5080 x 4064 image.
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Old 27-09-2007, 16:23   #4 (permalink)
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Re: Upsizing images

For that amount of upsizing you may be OK with bicubic. I'm not sure how you do that in PS but in PSP it's Image>Resize and then you can choose the resampling method.
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Old 27-09-2007, 16:56   #5 (permalink)
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Re: Upsizing images

I would suggest doing the up-sampling in ACR during the RAW conversion since this is using the first stage data. I have just done a comparison using this method compared to doing the RAW at normal size (11x8 inches approx) and then resizing in PS CS3. The RAW method has a 'very' slight edge but it is very slight indeed.

As Silk mentions, if the prints are viewed from the correct distance then it should be acceptable whichever way you do it. It is really very similar to enlarging a 35mm neg to 20x16, they only look OK at the right distance.

Bear in mind also that smooth tones can be enlarged more than fine detail so it is usually image dependent.

Cheers

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Old 27-09-2007, 16:59   #6 (permalink)
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Re: Upsizing images

Just occurred to me - remember that the paper surface finish will make a difference too. Matt papers will be more forgiving since they reduce the impression of fine detail due to their type of surface texture.

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Old 27-09-2007, 17:16   #7 (permalink)
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Re: Upsizing images

Thanks Les / Silkstone for your comments.

I was going along the matt route anyway, so that's good news.
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Old 28-09-2007, 07:26   #8 (permalink)
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Re: Upsizing images

I've heard good things about Alien Skin Blowup
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