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

[Hans Hagen via ntg-context]

On 10/5/2022 6:02 PM, Pablo Rodriguez via ntg-context wrote:


It happens both with LuaMetaTeX and LuaTeX. When playing with certain
levels of zooming, some blank spots are displayed inside the characters
(printing is fine).


Such artifacts can result from operating in the extremes and one has to 
keep in mind that maybe not all variables fonts have all characters 
tested for these extremes. Actually even regular fonts can have such 
effects like small bumps (we saw some in math fonts) and these also show 
up in font editors. But normally we don't see these at small sizes. Some 
has to do with 'sloppy or difficult or challenging' designs, some with 
(eo)fill side effects not much different from what mp graphics can do 
with envelopes (we've written about that). I'd not loose sleep over this.

 Hans


-
  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
   tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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Re: [NTG-context] LMTX generates PDFs with non-working fonts on real printers

[Pablo Rodriguez via ntg-context]

On 10/3/22 20:57, Leah Neukirchen via ntg-context wrote:
>> [...]
>> \setupbackend[level=0,compresslevel=0]
>> \starttext
>> Just a line of text.
>> \stoptext
>> [...]
>
> On Acrobat DC on macOS, there is a visible difference between the two files:

Hi Leah,

this issue also happens with PDF.js included in Firefox. TeX Gyre Heros
is even clearer with dubious hinting.

It has been already reported
(https://bugzilla.mozilla.org/show_bug.cgi?id=1781022).

But even with variable fonts from Adobe
(https://github.com/adobe-fonts/source-code-pro/releases/latest),
Acrobat has issues with the following code:

\definefontfeature
[book]
[axis={weight=600}]

  \definefontfamily
[mainface]
[rm]
[SourceCodeVariable]
[features={book,none}]

  \setupbodyfont[mainface, 100pt]

  \starttext
  \startTEXpage[offset=1em]
  AefKkQrt4
  \stopTEXpage
  \stoptext

It happens both with LuaMetaTeX and LuaTeX. When playing with certain
levels of zooming, some blank spots are displayed inside the characters
(printing is fine).

BTW, as Hans explained
(https://mailman.ntg.nl/pipermail/ntg-context/2022/106840.html), the
following top line avoids your printing issue (by setting LuaTeX as the
engine, instead of LuaMetaTeX):

  % engine=luatex

Just in case it might help,

Pablo
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