Tom's Hardware: Topic what's 28.3 mp in terms of print size?
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Archived from groups: rec.photo.digital (More info?)
On Wed, 08 Jun 2005 13:32:12 GMT, David J Taylor wrote:
> Mike Henley wrote:
>> John wrote:
>>> 25.6 * 19.2 inches at 240 pixels/inch
>>>
>>> 20.4 * 15.3 inches at 300 pixels/inch which is recommended
>>>
>>> John
>>>
>>
>> Thanks. Now that I think about it, it should've been obvious; you
>> divide the number of pixels by the pixels-per-inch and you're left
>> with the inches, right?
>
> Ah, but, how many pixels per inch is appropriate for the
> original poster's requirements - he didn't say!
Mike *was* the original poster, and he assumed "a default
resolution of 240 pixels/inch". 
But you may have been thinking
as I did, which is that 240 pixels/inch (dpi) isn't appropriate,
given the huge number of pixels (28.3mp) stipulated by the OP.
My thinking is that when sizes get sufficiently large, rules of
thumb (300dpi for prints, etc.) begin to become less valid. With
only a slight increase in the number of pixels, the formula used
above would predict a print whose dimensions are 2ft. x 3ft, which
isn't likely to be viewed as closely as a 4"x6" or 8" x 10" print.
By this I don't mean that fewer than 240 pixels/inch should be used
to produce 25.6 * 19.2 prints, since some detail would be lost.
Instead, that number of pixels would allow much larger prints to be
made (given a sufficiently wide printer) containing all of the
image's detail. For the 28.3mp specified by the OP, that would
allow a print nearly 4 feet by 6 feet to be made. At viewing
distances appropriate for prints of this size, I'd imagine that 150
dpi or 120 dpi would be reasonable.
Archived from groups: rec.photo.digital (More info?)
"Mike Henley" <casioculture@gmail.com> writes:
> What's 28.3mp (6144 by 4614 pixels) in terms of print size?
>
> Let's say assuming a default resolution of 240 pixels/inch, though this
> can be modified.
Then divide 6144 by 240 and 4614 by 240, and there's your answer.
In many uses big prints are viewed from further away, than smaller
prints, and hence can have lower resolutions and still look good.
With Photoshop and other image editors I've used it's easy enough to
print out one piece of a huge image, so you can see how that piece
looks at various distances without committing to printing the entire
picture that large. Since what's "acceptable" varies with the image,
viewing distance, viewer, and so forth, doing that kind of a test can
be very worthwhile. The rules of thumb (like 240 camera original
pixels per inch) are rules of *thumb*, not immutable laws of nature.
--
David Dyer-Bennet, <mailto
d-b@dd-b.net>, <http://www.dd-b.net/dd-b/>
RKBA: <http://noguns-nomoney.com/> <http://www.dd-b.net/carry/>
Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/>
Dragaera/Steven Brust: <http://dragaera.info/>
Archived from groups: rec.photo.digital (More info?)
"Mike Henley" <casioculture@gmail.com> writes:
> John wrote:
>> 25.6 * 19.2 inches at 240 pixels/inch
>>
>> 20.4 * 15.3 inches at 300 pixels/inch which is recommended
>>
>
> Thanks. Now that I think about it, it should've been obvious; you
> divide the number of pixels by the pixels-per-inch and you're left with
> the inches, right?
Yep. Now I feel like maybe I should apologize for my somewhat
sarcastic message just posted -- sorry!
This is a great example of the wonders of "units arithmetic" --
pixels / (pixels/inch) = inches
It's also a very useful sanity check -- if you follow through the
units arithmetic on your calculation and it comes out in the *wrong
kind of units* at the end, you've definitely done something wrong!
--
David Dyer-Bennet, <mailtod-b@dd-b.net>, <http://www.dd-b.net/dd-b/>
RKBA: <http://noguns-nomoney.com/> <http://www.dd-b.net/carry/>
Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/>
Dragaera/Steven Brust: <http://dragaera.info/>
Archived from groups: rec.photo.digital (More info?)
"David J Taylor" <david-taylor@blueyonder.co.not-this-bit.nor-this-part.uk.invalid> writes:
> Mike Henley wrote:
>> John wrote:
>>> 25.6 * 19.2 inches at 240 pixels/inch
>>>
>>> 20.4 * 15.3 inches at 300 pixels/inch which is recommended
>>>
>>> John
>>>
>>
>> Thanks. Now that I think about it, it should've been obvious; you
>> divide the number of pixels by the pixels-per-inch and you're left
>> with the inches, right?
>
> Ah, but, how many pixels per inch is appropriate for the original poster's
> requirements - he didn't say!
Well, he did specify 240 in his initial message -- phrased more as an
example to work with than as a known requirement, but he specified
it.
--
David Dyer-Bennet, <mailtod-b@dd-b.net>, <http://www.dd-b.net/dd-b/>
RKBA: <http://noguns-nomoney.com/> <http://www.dd-b.net/carry/>
Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/>
Dragaera/Steven Brust: <http://dragaera.info/>
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