On 2/14/2019 9:32 PM, Peter Münster wrote:
On Thu, Feb 14 2019, Lutz Haseloff wrote:

I wanted to use the degrade module with recent ConTeXt and LuaTeX.
Hi Lutz,

Could you please check, if the module grph-downsample.lua could fit your
needs?

The minimal example from the degrade manual gives an error.
See the attached log.
Is there any chance to get the module working again?
There is always a chance. The question is just: who will afford the
efforts...
Please check first the downsample module, and then let's see, if you
still need this very old and hackish degrade module.
you can plug in code

\startluacode

figures.converters["png"]["lowres.png"] = 
function(oldname,newname,resolution)
     os.execute(string.format('gm convert "%s" "%s"',oldname,newname))
end

figures.converters["jpg"]["lowres.jpg"] = 
function(oldname,newname,resolution)
     os.execute(string.format('gm convert "%s" "%s"',oldname,newname))
end

-- figures.suffixes["lowres.png"] = figures.suffixes.png -- suffix is 
automatically done

\stopluacode
\enabletrackers[graphics*]

\starttext
     \externalfigure[t:/sources/mill.png][conversion=lowres.png]
     \externalfigure[t:/sources/hacker.jpg][conversion=lowres.jpg]
\stoptext
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