Variable Types

[Squidbert]

When using Variable Fonts and checking ‘Map Optical Size to Font Size in Variable Fonts’ (under Preferences > Type), are the type sizes extrapolated from fewer drawings? For instance, in a 24 pt. size, does ‘Map Optical Size’ employ the Display-size drawing, or is the optical size created based on the selected size? In other words, for fonts that possess four optical sizes (Display, Subhead, Regular, and Caption) will selecting ‘Display’ produce the optimal rendering at 24 pt., while selecting ‘Custom’ extrapolates a rendering at the 24 pt. size?

[Mike Witherell]

Not sure if this helps, but I read this article about your question:

https://pixelambacht.nl/2021/optical-size-hidden-superpower/

This entry in the Adobe helpx seems too brief:

https://helpx.adobe.com/indesign/using/using-fonts.html

[Squidbert]

Many thanks, but what's not spelled out in Adobe's or other articles about Variable Fonts is that the OpenType feature appears geared to web, not print, spplications. The selling point is that there is less data when using the auto (Custom) feature, so that fonts render more quickly on web pages. That is, the optical sizes are extrapolated or rendered from fewer drawings. This is the opposite of what's wanted in print applications. So, when a range of four or five optical sizes are offered in a font, a truer rendering will be had by selecting Display, Subhead, Regular, or Caption optical sizes (using Adobe's nomenclature for the sizes), rather than selecting 'Map Optical Size to Font Size in Variable Fonts.' One can test this on screen by comparing the renderings.

If anyone has a contrary view of this, I'd be pleased to hear it.