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if not modules then modules = { } end modules ['grph-wnd'] = {
version = 1.001,
comment = "companion to grph-inc.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- Thanks to Luigi Scarso for making graphic magic work in luatex.
--
-- \externalfigure[hacker.jpeg][width=4cm,conversion=gray.jpg]
local converters, suffixes = figures.converters, figures.suffixes
local trace_conversion = false trackers.register("figures.conversion", function(v) trace_conversion = v end)
local report_wand = logs.reporter("graphics","wand")
local function togray(oldname,newname)
if lfs.isfile(oldname) then
require("gmwand")
if trace_conversion then
report_wand("converting %a to %a using gmwand",oldname,newname)
end
gmwand.InitializeMagick("./") -- What does this path do?
local wand = gmwand.NewMagickWand()
gmwand.MagickReadImage(wand,oldname)
gmwand.MagickSetImageColorspace(wand,gmwand.GRAYColorspace)
gmwand.MagickWriteImages(wand,newname,1)
gmwand.DestroyMagickWand(wand)
else
report_wand("unable to convert %a to %a using gmwand",oldname,newname)
end
end
local formats = { "png", "jpg", "gif" }
for i=1,#formats do
local oldformat = formats[i]
local newformat = "gray." .. oldformat
if trace_conversion then
report_wand("installing converter for %a to %a",oldformat,newformat)
end
converters[oldformat] = converters[oldformat] or { }
converters[oldformat][newformat] = togray
suffixes [newformat] = oldformat
end
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