OpenEuphoria

Re: JPEG Resolution

• Posted by Al Getz <Xaxo at aol.com> Mar 15, 2006
• 542 views

Evan Marshall wrote:
> 
> Jeremy Peterson wrote:
> > 
> > DPI means dots per inch, and just measures how many pixels there are in one
> > cubic inch of the screen.
> .....
> > It depends on what resolution you set it at.  If they both have the same
> > resolution,
> > it would be the latter.
> > 
> > Jeremy
> 
> 
> If you have a 64x64 DPI image and a 14" monitor set to 800x600 and a 21" 
> monitor set to 800x600, then by your first post, both monitors show the image
> with identical dimensions (1 *square* inch), but how can that be if the pixels
> are larger on the 21" monitor?

Hi there,


By knowing the dpi of the pic and the dpi of the monitors i think
it's possible to display the picture making it appear the same size
(approximately) on both monitors...thus a pic that was originally
sized at 1 inch by 1 inch would show up on BOTH monitors as
1 inch by inch...but who does this?  Most viewers try to display
the pic as large as possible i think so that they map each sample
of the pic to each pixel of the display.
Examples of where the dpi would be more important would probably
be in medical or industrial applications, where you may want each
(dentistry, say) tooth to show up as real size regardless of what
size monitor the Dr. (dentist) is using.

If you want buttons to display the same size on different monitors
you may wish to draw them using the dpi of the display as one of
the params too.  If you want the button 1 inch wide on a 96 dpi
monitor i guess you'd need 96 pixels across, while on a 180 dpi
monitor you'd need 180 pixels across, so the width param in these
two cases would be either 96 or 180.

I did some calculations just for the heck of it but im in a hurry
right now...i'll try to post later today.


Take care,
Al

And, good luck with your Euphoria programming!

My bumper sticker: "I brake for LED's"