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Is there a rule of thumb for maximum print size
Old 07-01-2003, 03:45 PM   #1 (permalink)
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for a given camera or x megapixel image? I have an olympus E10 and I'm wondering before I shell out $15-30 for a large print if anyone has any good guidelines for the maximum image size you should try for a given resolution.

Also is are there any additional guildelines for higher ISO's? For example I have a photo taken at 320 ISO that seems to be pushing the limits at an 8x10 size.

Thanks.
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Good guide here
Old 07-01-2003, 08:44 PM   #2 (permalink)
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Go here EZ prints Resolution guide This is pretty handy. These guys do GREAT work, I have used them on 3 jobs now, and my 20x30 prints are AWESOME! Take a look at this guide.

Steve
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B&H resolution guide
Old 07-01-2003, 08:53 PM   #3 (permalink)
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I would post the link but their site seems to be down. Just go to www.bhphoto.com then click on the digital photography > the select any system and there will be a Resolution guide on the right hand part of the screen
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Re: Good guide here
Old 07-02-2003, 08:53 AM   #4 (permalink)
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Just what i'm looking for but you haven't found their guide to be slightly optimisic? "Very good 8x10" from a .3 megapixel camera? What's the largest size from the lowest resolution source combination you've ordered? How did it look? Thanks!
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I know what you mean
Old 07-03-2003, 11:52 AM   #5 (permalink)
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OK...I do nothing with low res source, as I always shoot on Large Smooth format (D60) or RAW. I used to shoot low res sometimes, but I quit when people started asking to buy some prints. I always shoot hi res, because I can scale it down if I have to. I have ordered the 20x30 print, but it is with my D60 (6.3 megapixel). Sorry I cannot attest to the 8x10 with a .3mpx camera. I would not want to see that Very Good print! [img]/ubbthreads/images/graemlins/smile.gif[/img]

mckinneyphoto@earthlink.net
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Anybody have expirience with large prints of 4.0
Old 07-03-2003, 12:20 PM   #6 (permalink)
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megapixel images?

What were the results?

How did your 20x30 @ 6.2 turn out?
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My 20x30
Old 07-03-2003, 09:09 PM   #7 (permalink)
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My 20x30 print came out GREAT! I could not believe the quality. I would not have any problems selling them at all. I thought it looked better than a 16x20 from a 35mm. You might try it from EZprints, as they offer a 30 day satisfaction guarantee. If you are not pleased, they will refund your $$$ and all you are out is shipping. Very easy people to work with (no, I do not work for them) [img]/ubbthreads/images/graemlins/smile.gif[/img]

Steve
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Re: Is there a rule of thumb for maximum print size
Old 07-10-2003, 01:49 PM   #8 (permalink)
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I just picked up a Canon 10D and only shhot in high res too. Reason is because I'd like for my event coverage to be published in some magazines. I got an email back from the editor of a very highly respected magazine in the industry I'm focusing on and he told me that a 10D will only generate 11x7.5 max image size at 300 dpi. Doesn't sound right. My images are importing at a 48x24 at 72 pixels per inch in Photoshop. What does this translate to in dpi?
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Re: Is there a rule of thumb for maximum print size
Old 07-10-2003, 02:04 PM   #9 (permalink)
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Pixels per inch.....dots per inch....same thing....sooo

72 pixels per inch = 72DPI


Hope that helps

Rick Shellhouse
 
 
Re: Is there a rule of thumb for maximum print size
Old 07-10-2003, 05:18 PM   #10 (permalink)
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Brian

Yep -- you can do the math on the print and figure out what the max size of the print can be.

A couple of things first -- dpi is a relative term, it's how many per inch. Pixels is a fixed term, how many?

Think of your picture as so much butter. You have 4,000 x 3,000 pixel image. If you're going to spread that across a sheet of paper that's 9x12 at 300dpi -- you need (12*300=) 3,600 x (9*300=) 1,800. Do you have 3,600x1,800? Are you trying to spread too little butter over too much bread?

Here's another bit of digital math. The megapixel number is lengthxwidthxdepth. The depth for a color image is 3 pixels (RGB). So, if your capture is 640x480 your megapixels is .9 (921,600).

On the output aspect, there is interpolation. That is, the software fills in the gaps between existing pixels to increase the total number of pixels in the image. If you're not stretching it TOO far and the algorithm is good, you can add pixels with no problem. Photoshop has algorithms that do OK. If you want to make REAL BIG pictures -- buy something like Genuine Fractals. It can create REALLY BIG prints. A friend of mine scans in 25mm negs and uses GF to create 9 foot by 5 foot prints. The files size is VERY large. He has a problem with Photoshop, because he exceeds the maximum file size so he can only have a 250 dpi setting at that size.

How big is the capture from an E10? Look at the pixel size when you pull it into Photoshop and that will give you where you're starting.

Bob
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