On Fri, 2008-02-22 at 23:41 +0100, Daniel Hornung wrote:
> But maybe one of the 
> actual book writers on this list may tell you more. *hint*

I guess that's my cue.  :-)

The screen resolution is in pixels.  One pixel = one dot.  Most monitors
give you between 72 and 100 DPI, or dots per inch.  You'll notice that
you have a monitor that is 15"-24" inches across depending on how they
measure such things.  So you have 72*15 = 1080 dots across the screen
for the 15" monitor.  Now how do you convert that to printing for a

Well, in the book you want the same image but at a smaller size.  A
typical book is likely less than a typical piece of paper (around 8.5").
In fact, the actual image size is likely to be around 2"-4" across.  So
what DPI do you need to squeeze 1080 dots into (splitting the
difference) 3"?  1080/3 = 360DPI.  If you set your image resolution
(using Image->Scale Image and changing the X and Y resolution) to 300
DPI, then your image will be 3.6" across.  How do I know this?  

1. Create a new image (blank white background) at any size.
2. Image->Scale Image, then set the width to 1080 pixels.  Click on
"Scale" to scale the image to that size.
3. Image->Scale Image, then set the resolution to 300 for the X and Y
resolution.  Click on "Scale" to change the image resolution.
4. Image->Scale Image, then change the options menu next to the "Height"
field from pixels to inches.  Now you can see how wide your image is
going to be when it's 1080 pixels across.

Clear as mud?  Try it a few times. It's not that hard to grasp once you
see it in action.
Michael J. Hammel                                    Principal Software Engineer
[EMAIL PROTECTED]                           http://graphics-muse.org
He doesn't have ulcers, but he's a carrier.
-- From a real employee performance evaluation.

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