Dejavu Sans Typography: The Mystery of the r n Letter Sequence

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Discussion Overview

The discussion revolves around the visual appearance of the letter sequence "r n" in the Dejavu Sans typeface, specifically focusing on whether the perceived merging into an "m" is a design feature or an artifact of specific software and display settings. The scope includes typographic design, font rendering issues, and user experiences across different applications.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant observes that on their monitor using LibreOffice, the "r n" sequence appears as "m", questioning if this is a design feature or a specific issue with their setup.
  • Another participant notes that in MS Office, the "r n" sequence has a slight gap, suggesting a difference in rendering between applications.
  • A third participant mentions that there should be a space between the letters, referencing a source that discusses the font.
  • One participant proposes that the issue may stem from errors in the kerning tables of the font implementation, potentially due to a typo or data loss.
  • Another participant reiterates the possibility of kerning errors and introduces the idea that scaling might affect font rendering, complicating the appearance of letter spacing.
  • A known issue is referenced, linking to a bug report that may relate to the problem being discussed.
  • One participant elaborates on the complexities of font scaling, indicating that scaling does not always produce consistent results across different point sizes.
  • Another participant provides specific measurements of pixel spacing between the "r" and "n" at different point sizes, supporting the claim that the spacing can be too tight at times.

Areas of Agreement / Disagreement

Participants express differing views on the cause of the "r n" appearance, with some attributing it to software-specific rendering issues and others suggesting inherent problems with the font's kerning or scaling. No consensus is reached regarding whether it is a design feature or an error.

Contextual Notes

The discussion highlights limitations related to font rendering across different software and monitors, as well as the complexity of font scaling, which may not be uniform across various point sizes.

Stephen Tashi
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TL;DR
Does the design of Dejavu Sans type intend that "r" next to "n" look like an "m"?
On my particular computer monitor and computer, using 14 point Dejavu Sans type in Libreoffice, the sequence of letters "r n" looks like an "m".

typograhphyExample.jpg


Is this a deliberate feature of the design of Dejavu Sans type? Or is it something that only happens in
typograhphyExample.jpg
a peculiar combination of circumstances on particular monitors and software?
 
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This is how it looks in MS Office (Dejavu Sans, 14):
1605123860881.png
There is a slight gap between r and n.
 
Since it appears OK in MS Office, it sounds like an error in the kerning tables in your implementation of that font. It could be something as simple as a typo or a dropped bit.
 
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anorlunda said:
Since it appears OK in MS Office, it sounds like an error in the kerning tables in your implementation of that font. It could be something as simple as a typo or a dropped bit.
It can also be due to the scaling used (the font might not render correctly at all zoom factors).
 
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DrClaude said:
It can also be due to the scaling used

If only plain-old-scaling worked for typefaces. But real-life scaling is more complex: a 24 point font isn't identical to a 12 pt version with every dimension doubled. And that's before being turned into pixels, which makes the problem even worse.
 
Here, the spacing between the arm of the "r" and the "n" is 2 pixels at 24pt and 1 pixel at 22pt (screen display).

This confirms the info on the link @Vanadium 50 posted; it's too tight -- sometimes.
 

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