[NTG-context] LMTX generates PDFs with non-working fonts on real printers

[Willi Egger]

Now! I am astonished about this blog! Super that you, Leah and Hans, insisted to find out what the culprit was! Thank you both so much for your effort!

Kind regards
Willi

> On 11 Oct 2022, at 21:07, Leah Neukirchen via ntg-context <ntg-context at ntg.nl> wrote:
> 
> Hans Hagen via ntg-context <ntg-context at ntg.nl> writes:
> 
>> On 10/9/2022 8:03 AM, Max Chernoff via ntg-context wrote:
>>> Hi all,
>>> 
>>>> I use LuaMetaTeX 2.10 20220918 + ConTeXt LMTX 2022.09.11.
>>>> 
>>>> Here's a tiny test document, I disabled PDF compression but it also
>>>> doesn't work with the default settings.
>>>> 
>>>> \setupbackend[level=0,compresslevel=0]
>>>> \starttext
>>>> Just a line of text.
>>>> \stoptext
>>>> 
>>>> When I print this "directly" (i.e. sending the raw PDF to the printer)
>>>> on a Ricoh MP3053 or on a Samsung CLP-680DW, I just get an empty page.
>>> Just to add some more data points, I tested the attached MkXL file
>>> on
>>> two printers, and the file printed perfectly on both.
>>> Printer 1:
>>>    Brother HL-3170CDW
>>>    Printed via running "cat test.mkxl.pdf | nc Colour-Printer.local 9100"
>>>    Printer 2:
>>>    HP M227f LaserJet
>>>    Printed from the PDF file on a USB stick
>>>    Neither printer is anything fancy; they're both fairly
>>> inexpensive home
>>> laser printers. I've got a much older Brother laser printer that I may be
>>> able to test with next week.
>>> Sorry I can't be of more help.
>> Leah and I are zooming in on the issue. It might relate to wrong font
>> matrix default behavior in the pdf printer driver, and GS got a fix
>> for that long ago, so maybe old printers with not-updated drivers can
>> be affected.
>> 
>> Once we're confident that we can catch it Leah (who does the low level
>> introspective testing with viewers, printers and tools) likely will
>> report on it and there will be a test file for users to test if what
>> we do is okay before we apply the safeguard.
> 
> There's a write up now on the issue:
> https://leahneukirchen.org/blog/archive/2022/10/50-blank-pages-or-black-box-debugging-of-pdf-rendering-in-printers.html
> 
> -- 
> Leah Neukirchen  <leah at vuxu.org>  https://leahneukirchen.org/
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