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11-28-2008, 03:53 PM   #16
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How to check potential quality of large print

Of course you can tell what the quality will be like at a large size.

As a test crop out just one quarter of your picture. Print it to one quarter of the finished size and view. Bear in mind that for the big print you will actually be viewing the whole picture which will tend to look better than scrutinizing just a quarter of it.

If you can see the individual pixels up close then use interpolation to increase the pixel count.

11-29-2008, 09:16 PM   #17
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It can be done

Although I am no expert and have only had one picture printed above 11X14, I do know that the K10D can produce excellent 24X36 pictures. This picture, User Photo Gallery - Sports , was taken with a K10D and Pentax F 35-105 lens at F14, 1/200th, ISO 100. A copy printed at 24X36 is currently on my office wall. The picture was resized in photoshop elements 4.0 just for this print.
12-25-2008, 09:47 AM   #18
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i had my 24x30 poster print finally arrive, days before xmas which had me worried i wouldn't get it in time, and it came out pretty damn good. i use the k100d btw, and it was cropped just a tad, and the print is good. granted not perfect there are a few rough patches but i'm satisfied
12-25-2008, 03:57 PM   #19
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I had some 16x20s printed for Christmas...2 with my former 6MP 300D and 3 with my K10D.

I didn't upsize or anything like that...just sent Adorama the full size JPG.

I've got to say...this is the first time I've printed that big, and I'm highly impressed...especially with the K10 prints

12-25-2008, 05:42 PM   #20
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QuoteOriginally posted by bethtphotos Quote
Can the Pentax K10D produce a professional, print quality 16x22 print, or is that pushing the envelope in terms of mp? A client wants to enlarge a photo I'd taken with my K10d to at least this size, and asked me what the quality would be like. I honestly don't know, as I'm limited in the sizes I can print.

Up until about four months ago, an image I took nearly 18 months ago with my K10D (a lingerie shot for a clothing store chain) appeared on boarding platform billboards in train stations throughout central Germany. Like ChrisJ earlier, I'd estimate the size of those billboards to be roughly four by five feet and the image still looked pretty good. My only disappointment was the flatness of the image, which had lost colour saturation somewhere along the line (perhaps due to the printing process on billboard paper). Given that, it certainly should be quite possible to to get a very decent 16x22 print on "photo" paper.

12-27-2008, 09:44 AM   #21
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took a photo of my 24x30 print

12-27-2008, 10:55 AM   #22
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I regularly print 30X40 inches from my K10D and K20D and the results are very good. Sometimes, you need to "pad" the file to increase pixel count, but most of the time, the printer will do it on its own, so there really is no problem printing large format pictures.
12-27-2008, 01:43 PM   #23
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QuoteOriginally posted by janosh Quote
I don't buy the "viewing distance" theory. Many/most folks get within inches, no matter the size....middle agers especially may HAVE to get close because bifocals force book distance or too-far-away...unless they resort to those continuous bifocals, which are far inferior optically. Even giant murals need to look good at 12", and they do with good interpolation.
This is true a lot of large prints do not stand up to very close scrutiny.

However overall viewing does require that one stands back to be able to see the full picture and our tolerances are quite wide.

A very easy example is TV resolution -
Analog TV is rated at 720x480 (if we're lucky) and 27" sets are very common -
now that's 33.3 ppi horizontally and 30 ppi vertically - this would be pretty awful print quality -
since the accepted print resolution for quality is about 200ppi and about 150ppi minimum....

HDTV? - are we now talking?
1920x1080 but mostly this has to be screen sizes 40" minimum -
so we're now talking about 55ppi horizontally and vertically -
much better - but still pretty terrible for prints.

HDTV certainly is stunning -
but only at the correct viewing distances -
close up it still shows faults
(and I do not mean when displaying less than full resolution videos where there is obvious pixellation/breakup).

Probably the best is to go by the old standby 200ppi for print resolution -
so K10D with 3872 x 2592 gives 19.4" by 13" at 200ppi -
or should be able to give 176 ppi for 22"x14.7" - 162 ppi for 24"x16" (depending on which dimension is more important).
Worst case for 16"(x24") - then it'll have to be 162ppi -
162ppi is not too far away from 200ppi - generally held good enough for 10x8 prints which are about the largest handheld photos - so are open to close (nose to paper) scrutiny.

So I would say the K10D is fine for good quality 22x16 prints -
of course it does depend on how good the original photo was.......

Last edited by UnknownVT; 12-27-2008 at 03:34 PM.
12-27-2008, 07:29 PM   #24
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A few days ago I did a 12x18 print with my K100D from my local Costco. Everyone that I showed it to was shocked that it came from a 6mp camera.

It was a landscape picture of Yosemite. I did no upscale or anything. If the 6mp was good enough for 12x18 I am sure that the 10mp K10D would be fine for 16x22.
12-27-2008, 08:11 PM   #25
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QuoteOriginally posted by bethtphotos Quote
Hi all,

Can the Pentax K10D produce a professional, print quality 16x22 print, or is that pushing the envelope in terms of mp? A client wants to enlarge a photo I'd taken with my K10d to at least this size, and asked me what the quality would be like. I honestly don't know, as I'm limited in the sizes I can print.

3872 x 2592 pixels for a 10mp sensor.
.00568" per pixel (just assuming the long side for now..) .144mm for you metric people........
12-27-2008, 09:04 PM   #26

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I have said this before - I used and image from *ist Ds and the 50-200mm lens to make a 20x30 image through Costco. "Aroaki /Mt Cook 1" Viewable here PENTAX Photo Gallery came out just fine.

Your K10D with the "standard" Pentax lenses will do just fine. Stop fretting and start shooting.

The Elitist - formerly known as PDL
12-27-2008, 11:51 PM   #27
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QuoteOriginally posted by impete82 Quote
took a photo of my 24x30 print
Cute puppy, Pete. Yours?
12-28-2008, 06:40 PM   #28
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These are size 20x30 from my K20D and from the looks of it. It looks like it can go much larger if
you can get it right in camera.

12-30-2008, 02:28 PM   #29
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i deliver 16x20 prints to clients from the k10d no prob

i have a bit of canvas that size, too

the printmaker that i use says that some propositions i have for some 30x40 prints should look fine...
12-31-2008, 03:11 AM   #30
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QuoteOriginally posted by janosh Quote
I routinely print (Epson 2200) 12X18 from K20D...BUT...results sometimes don't equal 4000ppi Nikon scans of Astia or even of 160iso negative film, shot with several Canon FD SSC lenses (Canon F1). Those films are grainless at that magnification. I also prefer film for large B&W. My Pentax primes and sensor may equal or sometimes seem to exceed the resolution of the Canon and fine film. but there's a smoothness issue that's hard to describe...
My experience is somewhat different. For several years, I routinely scanned Astia 100f on a Minolta 5400ppi scanner. The results were excellent, but not nearly as clean as what I get from my K10D. The slightly higher resolution of the scanned film was negated by film grain. Hence, enlargements were not as pleasing.

I have many 13x19in prints from the K10d that are stunning. Printing larger should not be much of a problem. The bicubic algorhythms in PS do a fine job.


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