[NTG-context] Re: .jpx and .jxl

5 Mar 2024


      On Tue, Mar  5, 2024 at 15:18 (+0100), Taco Hoekwater wrote:
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On 4 Mar 2024, at 15:30, Jim  wrote:
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Recently I've been trying to make some PDFs smaller by using better
compression of JPEG pictures.
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I was happy to see that \externalfigure cheerfully accepts .jp2 (JPEG 2000)
files.  However, my understanding (and I could well be wrong, but I've seen
it multiple places) is that JPEG 2000 *Part 2* files should have extension
.jpx, not .jp2.
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By default, ConTeXt does not recognize .jpx.  But if I rename a .jpx file
to have a .jp2 extension, then ConTeXt properly processes the file and I
see the picture in the PDF.
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Q: are there any plans to make ConTeXt recognize the .jpx extension?
If not, can anyone suggest some ConTeXt code which allows me to tell
ConTeXt to process a .jpx file as a .jp2 file?
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The recognised extensions are specified in a table in grph-inc.lmt, I don’t 
think you can alter that table runtime.
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But it is possible to do
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\externalfigure[method=jp2,file=….jpx]
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Untested, but should work.
Taco,

I could not get that to work, but I did get
        \externalfigure[somefile.jpx][method=jp2]
to work.  Thanks very much for leading me to that solution.

                        Jim