72 pr 96 dpi web design?
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- pluto0
I find this thread annoying. Let's keep it at 72 dpi
- ribit0
keep what at 72dpi? ;)
'The myth of DPI'
http://www.rideau-info.com/photo…
- pmarckesano0
Don't you guys work ever?
hehe
Ok, read through the posts and what i have to argue is this--that BOTH dpi AND document size count towards a file size.
(They're both independent variables whose product determines the end file data size.)
Indeed, I ALWAYS assumed dpi did not vary too much. All this talk of 96 and 100 dpi has caught me by surprise. While I was aware that 'dot pitch' (diagonal distance between like-colored phosphor dots) varied on monitors, I always thought it was screen size and not dpi (resolution density) that determined overall resolution (1024 x 768, 1280 x 1024, etc.)
- ribit0
"that BOTH dpi AND document size count towards a file size."
sort of true... what you should say is that 'Document Size' and 'DPI' are ways of specifying or controlling image dimensions... such as in the Photoshop Image Size dialog, where changing these values will change the image pixel dimensions (or not, depending if 'resample' is ticked or not).
Programs like Image Ready don't even have DPI or Doucument Size in the Image Size dialog.. they only use the pixel dimensions - the only true measure of the image size.
- pmarckesano0
Ribit...
Article you posted is misleading in the context of our conversation.
Yes, it is true that DPI does not have to do with the overall quality (data amount) contained in a digital image...
But we are talking about screen displays here... where the DPI is relatively fixed.
...unlike print, for instance, where you could be going to press at variously 150 (newsprint), 300 (inkjet) or 600(laser/offset).
- PonyBoy0
Enter response:
okay okay... 'splane me this, Lucy...
how come if I have document in photoshop that is 400 px X 400px wide - at 300dpi... if I do a quick 'copy/paste' into flash or illustrator or whatever that the file is not to scale then?
... if dpi doesn't matter on screen - then why can't you copy and paste app to app?
and you're not explaining teh hole 96dpi selection for fonts in the windows display setting...
*confused
- ********0
my minitor is 300 dpi. I can't read this thread.
- ribit0
Illustrator probably places relative to the specified DPI since it is specifically a page layout program, so works in those terms..
The dpi setting choice in Windows has no known use as far as I can see...one looks crap, the other correct.
- ribit0
"But we are talking about screen displays here... where the DPI is relatively fixed."
fixed? Some of the dpis on my computers: 72dpi (Mac Classic), 96dpi (Dell 24") , 98dpi Cinema Display), 120dpi (Palm)
but if you are going to have a standard that is sort of roughly in the ballpark, I guess 72dpi is as good as anything (although you could argue it sshould be 96dpi these days... or 100dpi might be the new standard until everyone is using 300dpi screens in say 10 years?
- ribit0
fluxismo.. sit closer.
- pmarckesano0
It's all very simple:
PV = nRT
where n is the number of moles of gas present and R is the universal gas constant.
- ribit0
Hmmm... but is PV=NrT affected by relativistic speeds?
- johndiggity0
screen resolution is measured by total pixel count, not dpi, or more correctly ppi. your screen resolution, for instance, is 1024x768, not 72 ppi. ppi can change varying on different monitor resolutions, lcd vs crt, etc...
a modern crt can display anywhere between 72–130 pixels per inch. this number is the dot pitch of that monitor, and is independent of platform.
because 72 is generally the lowest number, it's also why it's the standard.
one
- pmarckesano0
There you go again Ribit, confusing the kids...
Interesting question, however...
If you have a bunch of gas in a box, and then you fly past that box at near-lightspeed, you are correct that the length of the box will appear to change, shrinking the volume (V) of the box by some factor 1/gamma.
The same number of particles are now in a smaller box, so the density goes up by the same factor gamma. But there's also an apparent slowing down of the gas relative to the walls, by a factor gamma-2, so the number of particles hitting the walls (per unit of observed time) actually goes DOWN by a factor of 1/gamma. However, each collision supplies more momentum to the walls (by a factor of gamma -- although this calculation is far from trivial) so all these effects exactly cancel: the pressure (P) stays the same. (All this analysis is just for the walls that are at the "front" and "back" of the moving box; the walls to the side have a different analysis I won't get into, but it gives the same answer...)
Now, if PV=NRT still holds, the above analysis tells us that T must drop by a factor of 1/gamma, to balance the drop in V. Would that mean that water vapor at 101o C could appear to be only 99o C in a different frame and condense to water? Einstein tells us this CAN'T happen -- the same phenomena must have consistent explanations in all reference frames, and the difference between steam and water is too great. But does that mean that water has a different condensing temperature in different frames? Or does PV=NRT not work in some reference frames? There appears to be a paradox here: it looks like SOME physics has to be different... This, I presume, is the heart of your question.
- orkman0
*Fuse in brain blows out*
Oh...owwwwwuch.
*Replaces fuse*
Ok...I'll just keep building at 72. Very intriguing thread however.
- ribit0
if we're talking about web design, you dont have to decide to build at '72' or anything else.
I'm using Image Ready for image preparation for the web, and there is nowhere to specify DPI, because its irrelevant.
Its only people who use Photoshop's PageSize/DPI method of manipluating the real image dimensions that will be seeing any reference to DPI, and then only as an abstract mathematical way of referencing the image size in terms they may be more familiar with.
- laurus0
72 DPI approximates 800 by 600 resolution on a CRT 15" monitor, the optimal resolution for most of these monitors.
96 DPI approximates 1024 by 768 resolution on the same monitor.
72 DPI does matter with some applications—try importing different resultion jpgs into flash, it'll resize them, assuming 72 is 100% (hence, higher resolutions will become smaller on screen and vice-versa).
- valentim0
hmm, what´s a pixel?