Resolution

[Jeff Vandehey]

I have a question regarding resolution. The computer monitor and projector
are displaying the presentation at about 72DPI, right? I know some monitors
have a higher DPI, but generally speaking is this correct?

If I insert and image that is 100 DPI (say a TIFF from Illustrator), does it
display at 72DPI? If I put in a 1200 DPI image that takes the same screen
space, is it still displayed at 72?

If I don't need to increase the size of the image, is there any benefit to
putting in a 600DPI image vs a 100 DPI image?

Final question, I promise. If you do a Save As and hit the options button,
you have the choice to change the resolution from 72 to 300, 600, etc. What
is the benefit for doing this?

If anyone has a link or a resource that explains this in basic way, please
let me know.

Thanks for the help.

 

[TAJ Simmons]

Jeff,

Forget DPI (unless you also mention a size in inches... e.g. the artwork scanned was 7 inches wide).

Think PIXELS!

See
http://www.powerpointbackgrounds.com/powerpointgraphics.htm

Cheers
TAJ Simmons
microsoft powerpoint mvp

awesome - powerpoint backgrounds,
free powerpoint templates, tutorials, hints and tips etc
http://www.powerpointbackgrounds.com

resolution. The computer monitor and projector

 

[Steve Rindsberg]

I have a question regarding resolution. The computer monitor and projector
are displaying the presentation at about 72DPI, right? I know some monitors
have a higher DPI, but generally speaking is this correct?

No, afraid not. Consider: I have an iBook, the dinky one with what, a 12" LCD
and it's running at 1024x768. I can hook the external video signal up to a 36"
monitor. I now have one image that's 3 times the size of the other, same
number of dots. Does that make it 1024/36" or about 28 dpi?

Nah, that's crazy. So's any other number we come up with. ;-)
So let's ignore DPI.

What's constant on any computer is the number of display pixels. Or at least
as close to constant as it gets in this business. That's what you want to
shoot for. If the display runs at 1024x768, then that's the size you want for
your full-slide images.

Here's a page on Microsoft.com that explains it a bit more fully - watch out
for line-wrap:

http://office.microsoft.com/assistance/preview.aspx?AssetID=HA011163551033&CTT=
98

Final question, I promise. If you do a Save As and hit the options button,
you have the choice to change the resolution from 72 to 300, 600, etc. What
is the benefit for doing this?

Here DPI's a bit more meaningful; your PPT slides have a size (set in Page
Setup). When you Save As and choose a bitmap format (PNG, BMP, TIF etc), PPT
multiplies the slide size by the resolution value you choose here to determine
how many pixels to create in the final image. The higher the number, the more
pixels, the more resolution, higher the quality of the image.

This has no effect when saving as a PPT file.