megavideolinks
Joined: 19 Nov 2011
Posts: 86
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 Posted: Fri Dec 02, 2011 6:47 am Post subject: Why can’t CSI use gif, bmp, jpg or jpeg graphic files to pri |
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Gif, bmp, and most jpg (also know as jpeg)
graphic files are “screen” graphics files and are
only 72 dpi (dots per inch.) They look beautiful
on a computer monitor, but are not high enough
resolution to print on a mouse pad (or on paper,
for that matter). Try printing your artwork to a
300 dpi or higher resolution laser printer and
you will see what we mean.
Important: Photoshop files and tif files can be
any resolution. Occasionally you see a high resolution jpg file. These file types must be at least
300 dpi in order to print properly.
Some graphics programs, such as Photoshop,
will let you increase the resolution of an image
by merely typing a bigger number into a dialog
box. This does not work. Here’s why.
Resolution is actually measured in “dots per
square inch.” 72 squared is 5,084 and 300
squared is 90,000. 5,084 divided by 90,000 is
.0565 (a little less than 6%).
When you tell the computer to increase the resolution from 72 dpi to 300 dpi, you are asking
the program to “guess” what 94% of the image
looks like when it knows what less than 6% of
it looks like. No wonder it doesn’t work.
The reason these programs let you change the
resolution is that it is possible to “reduce” the
resolution by “throwing away” parts of the
image. In this case the computer knows what
the entire image looks like and can make a good
guess as to which parts to eliminate. The main
use for this capability is to take a high resolution image and turn it into a screen graphic.
The only solution to the “screen graphics problem” is to have a different higher resolution
image elsewhere, have a “good” hard copy that
can be scanned in, or to have an artist redraw
the artwork using the low resolution graphics
file as a pattern.
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