* width/height in figure converter (was: t-degrade.tex)
2012-07-27 10:52 t-degrade.tex Peter Münster
2012-07-31 7:22 ` t-degrade.tex Jan Kula
@ 2012-07-31 15:04 ` Peter Münster
2012-07-31 22:36 ` t-degrade.tex (solved) Peter Münster
2 siblings, 0 replies; 5+ messages in thread
From: Peter Münster @ 2012-07-31 15:04 UTC (permalink / raw)
To: mailing list for ConTeXt users
On Fri, Jul 27 2012, Peter Münster wrote:
> Does it make sense, to port http://modules.contextgarden.net/t-degrade
> to mkiv, or is there already an existing solution in ConTeXt to
> downsample jpeg-images on the fly?
I've played a bit with the converters:
--8<---------------cut here---------------start------------->8---
\startluacode
figures.converters["jpg"] = {
["lowres.jpg"] = function(oldname,newname,resolution)
os.execute"something"
print(table.serialize(figures.current()))
end
}
\stopluacode
\starttext
\externalfigure[hacker][width=0.5\textwidth, conversion=lowres.jpg]
\stoptext
--8<---------------cut here---------------end--------------->8---
2 questions:
- How can I get the width and/or the height of the figure inside the
function? "0.5\9extwidth " is not very useful on the lua-side...
- How can I specify a sub-directory where to place the converted images?
(not so important, just to avoid cluttering the current directory)
TIA for any help,
--
Peter
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: t-degrade.tex (solved)
2012-07-27 10:52 t-degrade.tex Peter Münster
2012-07-31 7:22 ` t-degrade.tex Jan Kula
2012-07-31 15:04 ` width/height in figure converter (was: t-degrade.tex) Peter Münster
@ 2012-07-31 22:36 ` Peter Münster
2 siblings, 0 replies; 5+ messages in thread
From: Peter Münster @ 2012-07-31 22:36 UTC (permalink / raw)
To: mailing list for ConTeXt users
[-- Attachment #1: Type: text/plain, Size: 2368 bytes --]
Now I can downsample jpeg-files on the fly, see attached example file.
But I need 2 patches:
1.) To get the width and the height into the name of the file,
because when the figure dimensions change, there must be a new
conversion:
--8<---------------cut here---------------start------------->8---
--- grph-inc.lua~ 2012-06-05 10:37:01.000000000 +0200
+++ grph-inc.lua 2012-07-31 22:40:39.214426838 +0200
@@ -528,6 +528,9 @@
if resolution and resolution ~= "" then -- the order might change
newbase = newbase .. "_" .. resolution
end
+ local width = figures.current().request.width
+ local height = figures.current().request.height
+ newbase = newbase .. "_" .. width .. "_" .. height
--
-- see *, we had:
--
--8<---------------cut here---------------end--------------->8---
2.) To avoid crap in the width and height options:
--8<---------------cut here---------------start------------->8---
--- grph-inc.mkiv~ 2012-07-20 23:26:52.000000000 +0200
+++ grph-inc.mkiv 2012-08-01 00:02:23.851094854 +0200
@@ -293,6 +293,10 @@
%
\the\t_grph_include_local_settings
\dostarttagged\t!image\empty
+ \edef\current_width{\externalfigureparameter\c!width}%
+ \edef\current_height{\externalfigureparameter\c!height}%
+ \def\nocrap##1{\doifnotemptyvalue{##1}{%
+ \the\dimexpr\csname##1\endcsname\relax}}%
\ctxlua{figures.push {
name = "\p_grph_include_name",
label = "\p_grph_include_label",
@@ -312,8 +316,8 @@
resolution = "\externalfigureparameter\c!resolution",
color = "\internalspotcolorparent{\externalfigureparameter\c!color}", % hack is needed
["repeat"] = "\externalfigureparameter\c!repeat",
- width = "\externalfigureparameter\c!width", % can be crap
- height = "\externalfigureparameter\c!height", % can be crap
+ width = "\nocrap{current_width}", % no more crap
+ height = "\nocrap{current_height}", % no more crap
} }%
\ctxlua{figures.identify()}%
% also mode: checkpresense only
--8<---------------cut here---------------end--------------->8---
Hans, could you please patch the files?
Cheers,
--
Peter
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: downsample.tex --]
[-- Type: text/x-tex, Size: 1431 bytes --]
\startluacode
local format = string.format
-- figures.cachepaths.path = "cache" -- should be setup-option
local function sample_down(oldname, newname, resolution)
local request = figures.current().request
local width = request.width:sub(1, -3)
local height = request.height:sub(1, -3)
if resolution == "" or (width == "" and height == "") then
print(format("Nothing to do: %s, %s, %s", oldname, newname, resolution))
return
end
local inch = 72.27
local image = img.scan{filename = oldname}
local xy = image.xsize / image.ysize
if width == "" then
width = height * xy
end
if height == "" then
height = width / xy
end
local xsize = resolution * width / inch
local ysize = resolution * height / inch
if xsize < image.xsize or ysize < image.ysize then
local s = format("gm convert -resize %dx%d %s %s",
xsize, ysize, oldname, newname)
print("Conversion: " .. s)
os.execute(s)
else
print(format("Nothing to do: %s, %s, %s", oldname, newname, resolution))
print(format("xsize = %d, ysize = %d", xsize, ysize))
end
end
figures.converters.jpg = figures.converters.jpg or {}
figures.converters.jpg["lowres.jpg"] = sample_down
\stopluacode
\starttext
\setupexternalfigures[resolution=50, conversion=lowres.jpg]
\externalfigure[hacker][width=0.5\textwidth]
\setupexternalfigures[resolution=10]
\externalfigure[hacker][width=0.5\textwidth]
\stoptext
[-- Attachment #3: Type: text/plain, Size: 485 bytes --]
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
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