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The saga continues...now what about printer resolution?
Old 01-19-2004, 03:32 AM   #1 (permalink)
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It's been a tough weekend with about 16 hours of model shoots...well the photography may not have been that long but the waiting seemed to drag on...sigh!

Anyway, we rented out a Canon Digital Rebel as the owners of HotShotz seem to be going that direction. Better than a D30 but not yet a 10D. However at the end of the very long day (with many, many images) the one model wanted some printouts of some of her images to take home to show her mom. When the owner did one of the printouts he was most displeased by the pixelation. So I had him open one of the shots we did this afternoon. He opened the jpeg (High/Fine) in Photoshop and then went to image size. What he saw was the pixel count of 18M, but the document size was something about 11x17 and the dpi was 180. He was surprised (actually he was upset) that the dpi would be so low as he figured with 6megapix he should have better document size and higher dpi. The way he put it..."This Rebel is not any better than my PowerShot". So now I figure he's going to rethink the whole bit of purchasing the Digital Rebel...and we can't forget about the 10D.

So how do I explain to him the ability of getting big prints at (say) 300dpi?

Going RAW won't help matters nor moving up to the 10D...the sensor is still only 6megapix. I tried increasing the dpi in that opened file and of course the pixel count increased...ie. Photoshop was going to add pixels. He's concerned about quality of bigger prints being compromised by the additions.

At what point, in film, does enlarging affect the quality of the print? I seem to remember reading that 35mm negs have the equivalent of 24megapix so the enlargement to say 24x36 should still be good.

What can I say to rest his mind at ease? [img]/ubbthreads/images/graemlins/confused.gif[/img]

Help!

Richard
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Re: The saga continues...now what about printer resolution?
Old 01-19-2004, 01:04 PM   #2 (permalink)
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[ QUOTE ]
When the owner did one of the printouts he was most displeased by the pixelation. So I had him open one of the shots we did this afternoon. He opened the jpeg (High/Fine) in Photoshop and then went to image size. What he saw was the pixel count of 18M, but the document size was something about 11x17 and the dpi was 180. He was surprised (actually he was upset) that the dpi would be so low as he figured with 6megapix he should have better document size and higher dpi. The way he put it..."This Rebel is not any better than my PowerShot".

[/ QUOTE ]

First off, I've printed from a D30 at 125dpi with no pixelation up to 11x17 so his printer is suspect of being unable to print a high quality image.

Second, that same file that will print at 11.378x17.067 at 180dpi will also print at 8x12 at 256dpi, again plenty for a quality print. I'm assuming the printer guy doesn't know how to convert the document size in Photoshop.

[ QUOTE ]
So how do I explain to him the ability of getting big prints at (say) 300dpi?


[/ QUOTE ]

There are several resampling softwares that interpolate the image up to the print size and dpi that you need. I use some custom programs with excellent results but you can also use programs like Genuine Fractals. I can print all the way up to 60x80" at 300 dpi.

 
 
Re: The saga continues...now what about printer resolution?
Old 01-19-2004, 04:08 PM   #3 (permalink)
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Yup, what Mark said about the conversion process being suspect has to be it. The 10D is used by any number of professional people. Heck the Olympus E10 a 4mp camera was being used by one or more magazine staff photographers and you couldn't see any pixilazation in the 8x10 prints there.

For that matter I've printed 13x17 prints off both the E10 and 10D and there's no visible loss of detail.

On the other hand, I'm pretty sure that given 30 seconds I can take an image captured with a $20,000+ digital back and a Hassiblad H1 and make it the worst peice of crap you can imagine. [img]/ubbthreads/images/graemlins/smile.gif[/img]

You might want to try taking one of the files you have and give it to someone who knows what they're doing with a printer and give it a shot again. I'm pretty sure they'll be able to come up with a better print.
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