On 03 Dec 2008, at 12:28, sandraB wrote:
Hi
I'm using fop-0.95 to generate a PDF file from an xml template, I
have a
problem regarding the external-graphic renderer. I never had the
correct
size in the pdf for gif or png images even if I can modifiy the size
by
changing the external-graphic attributes. Could you help me to
resolve this
issue.
To get the most accurate results:
The xml
<!-- The same image (size gived by Gimp) -->
img src="images/topic.png" content-width="136mm" content-
height="88mm" />
img src="images/topic.gif" content-width="13mm" content-
height="8mm" />
img src="images/topic.gif" content-width="13.652cm" content-
height="8.855cm"
Sizes in mm/cm as displayed by image viewers are not always
dependable. If there is no native resolution present in the image
file, most viewers default to 96dpi or 120dpi for on-screen display.
FOP, when using the PDF output target, would on the other hand assume
a resolution of 72dpi, which would make the same image appear larger
than an image viewer shows it to be.
What you should look for is the size in pixels /and/ the proper
resolution (if any).
Once you have those, the calculations become rather straightforward.
For example:
default content-width = (intrinsic width in pixels) * (native
resolution / 72)
If you want to avoid doing any calculations altogether, then use
height/width to specify the desired size, and 'scale-to-fit' for
content-width/content-height. No matter what the intrinsic size is,
FOP will then do its best to scale the image to fit the specified
height/width.
Example:
<fo:external-graphic
height="2cm" width="2cm"
content-height="scale-to-fit" content-width="scale-to-fit"
src="..." />
The resulting image will never take up more/less space than 2x2cm.
Starting with FOP 0.95, support was added for 'scale-down-to-fit' if
you want to keep small images in their intrinsic size.
HTH!
Andreas
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