[Dev-luatex] Q: image size

Hans Hagen pragma at wxs.nl
Mon Nov 29 22:33:08 CET 2010


On 29-11-2010 10:07, Patrick Gundlach wrote:
> Hi,
>
> what is the difference of img.width and img.xsize? (reference manual 4.5.2 img.keys)
>
> For example, the cow.pdf gives me
>
> img.width = 18646779 and img.xsize = 18089984
>
> What are the units? img.width is in sp, what about img.xsize?

all units in luatex are scaled points

the difference is some 8.4 pt which is somewhat weird

\the\dimexpr18646779sp/\number\dimexpr1bp

\the\dimexpr18089984sp/\number\dimexpr1pt

that's pretty close so maybe the xsize (bounding box values) takes the 
wrong unit when conversion to sp takes place

Hans



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