Any resolution greater than that of your monitor, most likely around
72 dpi, is lost in the firmware's attempt to interpret the "in between
pixel colors or resolution". Apple's 24" iMac LCD screen is 1920 x
1200 pixels. The horizontal dimension of the screen is 20.5". Math
says the pixels per inch is 93.66.
However, if you don't constrict the size of an image you post online,
as in upload it as actual size, it can be viewed at the resolution you
shot it at. Working with images on your computer you know that that is
a huge image when viewed at your monitors resolution. Basically pixel
for pixel displaying.
So when a photo viewed online takes forever to draw, it's because it
is at a higher resolution than the up-loader or the software will
allow you to see or download. It wastes time at both ends.
300 dpi seen as 12 inches as sized by you can be viewed at a bit more
than 3 times that size. Printing is usually at 150-300 dpi, so it
could be 2 times that size printed.
If I'm wrong, someone else will explain it better in a moment, I'm sure.
:-)
On Aug 15, 2010, at 14:09 , Ann Sanfedele wrote:
Is there any point to display an image on line at 300 PPI as
opposed to 72 (or 96) with the same outside dimensions of, say
1200 x 800 ? Or as .png as opposed to jpg ?
"someone" told me once that the human eye can't see any more detail
on a screen than 72 ppi anyway and since it loads faster,
one need not make images larger...
Yet it seems to me that some images you guys pointing to 1 mg to 3
mg files on line do look "better"... on my LCD monitor...
Has something changed with the technology so that one can tell the
difference now as opposed to say 3 or 4 years ago?
My eyes are so shot i know it doesnt matter, but it does matter that
others see my stuff at it's best under certain circumstances.
I've avoided asking you guys this for awhile cause it makes me feel
inadequate not to know -- :-)
Almost all the files I send to smugmug are 300 ppi/dpi and 12
inches across - and a few mgs... but I don't know if
the site translates them to show them on my site at a lesser
resolution.
Joseph McAllister
pentax...@mac.com
The Big Bang was silent, and invisible in it's beginning moments.
— from the Pentaxian's thoughts on particle physics, so far.
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