On Jun 7, 2004, at 2:13 AM, Chris Bowditch wrote:
Christian Hattemer wrote:
If it's true that graphics measurements specified in INCHES yields better results than PX, that certainly is news, and would (if reproducible) warrant special mention on the FOP Graphics page. Can you also do a test to see if the results are similar if you specify mm and cm (millimeters & centimeters of course ;-)) as well?
I think the problem is that pixels are not well-defined. In general, a pixel is an output-dependent unit. On a printer, a pixel might be 1/2400 inch, on the screen, 1/96". The Recommendation warns about this in 5.9.13.1 Pixels. I suggest that anyone tempted to define lengths in "px" read that section of the Recommendation. It's not so bad if the units are completely "internal", that is, that it only affects text, tables and the like. But when you import an image constructed externally, and defined in pixels for God knows what output device, you are asking for trouble.
Consider the lengths that Gimp goes to on installation to make sure that images are reliably sized. You must effectively tell Gimp exactly what the size of a screen pixel is on your monitor. Incidentally, if you want to find out about the dimensions of images, install Gimp and load the image. Because of Gimp's awareness of your monitor size, you should be able to get reliable translations of image sizes into stable units.
Bottom line - don't define *anything* in px.
BTW, I don't know if this is related, but GIF images do not scale well, as they are a form of a INDEXED BITMAP image. JPG images scale much better. This could be part of the problem. If you're working with line drawings, perhaps SVG might be a better format to use in your documents.
This leads to the question: How can I find out the actual resolution of my
images and calculate the dimensions in inches? Do I have to modify the
generated fo afterwards to include the calculated dimensions?
Dont you know the resolution of the images? It is difficult for me to answer this question as I dont know where you get the images from. In my environment, the system responsible for generating the images stores the measurements in cm/mm/inches along with the resolution and the image itself.
Chris
Can't you just load the image directly into a web browser:
images/NetworkModel/Basics/BachmanDiagram.GIF
-- Peter B. West <http://www.powerup.com.au/~pbwest/resume.html>
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