[NTG-context] Re: .jpx and .jxl
Jim schrieb am 04.03.2024 um 15:30: Recently I've been trying to make some PDFs smaller by using better compression of JPEG pictures. 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. 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. 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? Adding \definegraphictypesynonym [jpx] [jp2] at the begin of your document should do the trick. Wolfgang ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___
[NTG-context] Re: .jpx and .jxl
On Tue, Mar 5, 2024 at 15:18 (+0100), Taco Hoekwater wrote: >> On 4 Mar 2024, at 15:30, Jim wrote: >> Recently I've been trying to make some PDFs smaller by using better >> compression of JPEG pictures. >> 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. >> 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. >> 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? > The recognised extensions are specified in a table in grph-inc.lmt, I don’t > think you can alter that table runtime. > But it is possible to do > \externalfigure[method=jp2,file=….jpx] > 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 ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___
[NTG-context] Re: .jpx and .jxl
> On 4 Mar 2024, at 15:30, Jim wrote: > > Recently I've been trying to make some PDFs smaller by using better > compression of JPEG pictures. > > 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. > > 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. > > 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? The recognised extensions are specified in a table in grph-inc.lmt, I don’t think you can alter that table runtime. But it is possible to do \externalfigure[method=jp2,file=….jpx] Untested, but should work. Best wishes, Taco > > > I have also been investigating the use to JPEG-XL files (.jxl). One of the > interesting aspects of JXL files is that .jpg files can be **losslessly** > compressed into .jxl files. (That is, you can recover the exact .jpg from > the .jxl file if you want, so there is no further degradation of the image > by doing this lossless compression.) I have been seeing 20% to 30% > reduction in file sizes by converting JPGs into JXLs, which I would be > happy to make use of in my PDFs, if possible. > > Bonus question: is there any plan to support JXL files in ConTeXt? > > Thanks. >Jim > ___ > If your question is of interest to others as well, please add an entry to the > Wiki! > > maillist : ntg-context@ntg.nl / > https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl > webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) > archive : https://github.com/contextgarden/context > wiki : https://wiki.contextgarden.net > ___ — Taco Hoekwater E: t...@bittext.nl genderfluid (all pronouns) ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___
