NEED HELP WITH AN EXPERIMENT

DK
Posted By
DURNFORD_KING
Jul 20, 2006
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262
Replies
8
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Closed
I’ve got some 35mm film images that I scanning in at 4000 DPI on my CanoScan FS 4000. A gallery has asked me if I can produce a high quality 8 foot by 5 foot image from one of the shots. I have my doubts but I want to do an experiment to find out by using one portion of the image and printing it on my Epson at 13 X 19.

There are two obvious ways to do this — take a small piece of the original and, using either Genuine Fractals or Fred Mirinda’s SI Pro 2 – Stair Interpolation Pro, and blowing it up to the size it would be as part of the 8 X 5 image — or blow the whole image up and print a 13 X 19 portion of it to see how it comes out.

I’ve attempted to use the Mirinda Interpolation programs to blow up the entire image to 8 X 5 but CS2 freezes each time. Any thoughts?

I’m running duel core with a P4 chip
4 gb memory
two large internal HD’s.
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AC
Art Campbell
Jul 20, 2006
If it was me, I’d pick the vendor (or a few possiblities) that you’re going to use to print the Big Print and ask them what the preferred method and workflow should be.
Also, depending on the vendor’s hardware, they may have better programs (such as a dedicated RIP) to inerpolate that large than you do.
While it may be nice to play with a portion of the print on your own printer, it’s kind of academic unless you’re planning on making a mosaic from 13×19 sheets. Test on the real output device or don’t bother….

Art
BL
Bob Levine
Jul 20, 2006
a high quality 8 foot by 5 foot image from one of the shots.

Please define high quality. For something that large 25-50 ppi may be more than enough resolution.

Bob
DR
Donald_Reese
Jul 20, 2006
You could also check out having a higher res scan done on the likes of an imacon or some other drum scanner. i agree that high quality is subjective.
CN
Cybernetic Nomad
Jul 21, 2006
Also, if your originals are 35mm negs, then the film will probably be a greater limitation to the final quality of the image than the current resolution. (unless they have really, really, really fine grain)
BG
barry_gray
Jul 21, 2006
Cy,
That would be really, really, really, really, really, really, really, really, really…fine grain.
JS
John_Slate
Jul 21, 2006
So a 24 x 36 mm scan @ 4000 ppi would be 3880 x 5669 pixels.

Not exactly proportional to 5 x 8 feet, but to get the 36mm to 8 feet would be a 6,773% enlargement!

Cy and barry are right. At that scale the grain of the 35mm becomes part of the detail of the picture.

Without resampling then, your scan would need to be 59ppi to print at that size.

I’m guessing that’s probably fine, all things considered.

The grain on the other hand is something else. There are those that must do these tremendous blow-ups and I would wager they must have a trick or too to minimize grain… unfortunately I am not one of them.

Working from a larger format original would be key I imagine, and perhaps getting the 35mms blown-up to 4 x 5 transparency film might help?
DK
DURNFORD_KING
Jul 21, 2006
Thanks to all who responded to my query. You are a great resource and I appreciate your input.
CN
Cybernetic Nomad
Jul 22, 2006
Working from a larger format original would be key I imagine, and perhaps getting the 35mms blown-up to 4 x 5 transparency film might help?

It helps to reduce the "golf ball" sized grain, but will also yield a softer image (blur is introduced by the analog proces of enlarging the 25mm neg to 4×5 or 8×10) I personally prefer the effect, but that’s personal, you’ll have to try and see for yourself.

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