Proper setting of font features for protrusion/expansion

Proper setting of font features for protrusion/expansion

[Jan Tosovsky]

Dear All,


e.g. in the last example at http://wiki.contextgarden.net/Protrusion there
is the following definition:

\definefontfeature[default][default][expansion=quality,protrusion=quality]


I understand it overrides default settings and adds these two features.

In my code I use the following shortcut found somewhere:

\definefontfamily[palatino][rm][Palatino Linotype][features={default,
quality}]


Both features works, but I am not sure if I am getting the best quality.

Is there any description what that '[features={default, quality}]' option
really does?


Thanks, Jan




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Re: Proper setting of font features for protrusion/expansion

[Hans Hagen]

On 5/4/2014 10:41 PM, Jan Tosovsky wrote:
> On 2014-05-04 Wolfgang Schuster wrote:
>> Am 04.05.2014 um 19:34 schrieb Jan Tosovsky:
>>
>>> In my code I use the following shortcut found somewhere:
>>>
>>> \definefontfamily[palatino][rm][Palatino Linotype][features={default,
>>> quality}]
>>>
>>> Is there any description what that '[features={default, quality}]'
>>> option really does?
>>
>> When you apply features to a font you can set a list of features and
>> all of them will be applied.
>>
>> In the example below you can see both methods, the first text uses the
>> new featurelist "testfeature" which uses "default" and extends it with
>> "protrusion=quality". The second text applies the two predefined lists
>> "default" and "quality" (which sets "protrusion=quality"
>> and "expansion=quality").
>>
>> \definefontfeature[testfeature][default][protrusion=quality]
>> ...
>> \startfont[Serif*testfeature]
>> ...
>> \startfont[Serif*default,quality]
>
> Aahh, thanks.
>
> So it is the preset name what confused me here... From my POV the 'quality'
> should be replaced with the more specific label. I believe it will enhance
> readability the code. I can imagine even 'microtypography' for this kind of
> preset.

quality is just a tag for a preset ... on can add his/her own

btw, i have no clue what micro or typography is involved (esp when 
excessive values are used) ,,, using that term for a preset would be 
rather confusing

> Jan
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>


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Re: Proper setting of font features for protrusion/expansion

[Jan Tosovsky]

On 2014-05-04 Wolfgang Schuster wrote:
> Am 04.05.2014 um 19:34 schrieb Jan Tosovsky:
> 
> > In my code I use the following shortcut found somewhere:
> >
> > \definefontfamily[palatino][rm][Palatino Linotype][features={default,
> > quality}]
> >
> > Is there any description what that '[features={default, quality}]'
> > option really does?
> 
> When you apply features to a font you can set a list of features and
> all of them will be applied.
> 
> In the example below you can see both methods, the first text uses the
> new featurelist "testfeature" which uses "default" and extends it with
> "protrusion=quality". The second text applies the two predefined lists 
> "default" and "quality" (which sets "protrusion=quality"
> and "expansion=quality").
> 
> \definefontfeature[testfeature][default][protrusion=quality]
> ... 
> \startfont[Serif*testfeature]
> ...
> \startfont[Serif*default,quality]

Aahh, thanks. 

So it is the preset name what confused me here... From my POV the 'quality'
should be replaced with the more specific label. I believe it will enhance
readability the code. I can imagine even 'microtypography' for this kind of
preset.

Jan

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Re: Proper setting of font features for protrusion/expansion

[Wolfgang Schuster]

Am 04.05.2014 um 19:34 schrieb Jan Tosovsky <j.tosovsky@email.cz>:

> Dear All,
> 
> 
> e.g. in the last example at http://wiki.contextgarden.net/Protrusion there
> is the following definition:
> 
> \definefontfeature[default][default][expansion=quality,protrusion=quality]
> 
> 
> I understand it overrides default settings and adds these two features.
> 
> In my code I use the following shortcut found somewhere:
> 
> \definefontfamily[palatino][rm][Palatino Linotype][features={default,
> quality}]
> 
> 
> Both features works, but I am not sure if I am getting the best quality.
> 
> Is there any description what that '[features={default, quality}]' option
> really does?

When you apply features to a font you can set a list of features and all of them will be applied.

In the example below you can see both methods, the first text uses the new featurelist
“testfeature” which uses “default” and extends it with “protrusion=quality”. The second
text applies the two predefined lists “default” and “quality” (which sets “protrusion=quality”
and “expansion=quality”).

\setupalign[hanging]

\definefontfeature[testfeature][default][protrusion=quality]

\showframe[text][text]

\starttext

\startfont[Serif*testfeature]
\input knuth
\stopfont

\startfont[Serif*default,quality]
\input knuth
\stopfont

\stoptext

Wolfgang
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