Greetings,
On Jun 8, 2004, at 1:55 PM, J.Pietschmann wrote:
Darn, the mail server failed yesterday. Resending.
And I thought it was just me...
Peter B. West wrote:
> 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.
Well, perhaps we should use wording like this in graphics.xml:
"FOP always assumes a resolution of 72dpi on encountering pixel
measurements, regardless of the output device, and converts all length
measured in pixels in millipoints using 1/72 pixels per inch as
conversion factor. The layout stage doesn't use pixels, even if the
final rendering is on a bitmapped device like the monitor. A bitmapped
image without explicit measurements is assumed to have the actual pixel
counts as measurements. Any resolution declaration in the image metadata
is ignored."
I was about to make these changes, when I realized I wasn't certain where these edits would be made:
Overview of Graphics Support http://xml.apache.org/fop/graphics.html#support-overview
Graphics Resolution http://xml.apache.org/fop/graphics.html#resolution
I am leaning towards the latter. Which leads to the question: replace the first paragraph?
BTW, nice work, Jorg!
BTW does someone know how resolution is stored in GIFs, and whether the Java image API can retrieve this?
I was under the impression GIF files were always 8-bit (256 color) at 72dpi.
This search gave me some nice hits: http://www.google.com/search?q=GIF+resolution&ie=UTF-8&oe=UTF-8
> Bottom line - don't define *anything* in px.
Yeah, double this. I have no idea why people are confused to no end by this issue.
J.Pietschmann
If we put it on the site in a WARNING box, it'll resonate...
Web Maestro Clay
--------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
