On 13/07/23 13/07/23, 09:19, Hans Hagen wrote:
On 7/11/2023 2:22 PM, Henning Hraban Ramm wrote:
What’s the current approved way to get image properties within a Lua
function?
very old:
local pic = figures.getinfo(figures.current().status.fullname)
used to work in 2019:
local pic = img.scan{filename = figures.current().status.fullname}
if I understand this right, "img" isn’t valid anymore:
"""
token call, execute: grph-imagelib.lua:37: attempt to index a nil
value (global 'img')
"""
I’d like to know the pixel size and if possible also the scaled target
size of an image; either the "current" one or by name.
\ctxlua{inspect(figures.getinfo("t:/sources/mill.png").used)}
\ctxlua{inspect(figures.getinfo("t:/sources/mill.png").status)}
etc .. no more faking the img lib
Hans
Hraban, Hans, and mailing list.
This is interesting. I would find it useful to be able to report these
properties though a tracker - should be fairly easy if not already
available.
One works with images having a certain resolution, whatever that may be.
We also might have a target resolution, say 300 dpi or perhaps better
for printing. As the images are typically resized when used, the
resulting resolutions might be anything. Optimizing the resolutions of
the source images can result in optimal PDF sizes, i.e. not too high nor
too low resolution.
I can even imagine an automated workflow where high-resolution, say 2400
dpi or even greater bitmap images, are supplied and the included bitmap
could be "resampled" resulting in the inclusion of a targeted
resolution. However, the reporting of the included, likely resized image
resolutions then used to adjust or resample the source files externally
and manually case-by-case would be sufficient.
Any suggestions on how to hook-in such reporting?
Bonus question: how also to handle the case of
\startMPcode
draw figure "MyFigure" xsized TextWidth ;
...
\stopMPcode
--
Alan
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