Noto Serif Kannada number height

[MayuraVerma]

Defect Report

Kannada numerical are shorter compared to Hindu-Arabic numerials. It should be same height

Title

Should be brief but contain essential information.

Font

'NotoSansKannada-Regular.ttf'.

Where the font came from, and when

https://github.com/googlefonts/noto-fonts/blob/master/phaseIII_only/hinted/ttf/NotoSerifKannada/NotoSerifKannada-Regular.ttf

Font Version

Version 2.002; ttfautohint (v1.8.2)

OS name and version

MacOS 11.0 Beta (20A4299v)

Application name and version

Safari

Issue

Kannada numbers height is shorter compared to Hindu-Arabic numbers.
Kannada numbers should should be taller than the Kannada letters and it should be the same height as the Hindu-Arabic numbers.

Character data

೦೦೦೧೦೨೦೩೦೪೦೫೦೬೦೭೦೮೦೯೦ 1234567890
೧೦1೧2೧3೧4೨5೧6೩7೧8೪9೧0೫೧೬೧೭೧೮೧೯೧

Screenshot

Noto Serif Kannada - Short height

Noto Sans Kannada - Correct form

[MayuraVerma]

This is very serious bug and perhaps an easy fix.
Please @nizarsq review. This one simple change will make Noto Serif Kannada font almost perfect for professional use.
Without this change, this font would be unusable.

[nizarsq]

@MayuraVerma thank you for reporting this issue. Will look at it.

[MayuraVerma]

This is true across all platform

[nizarsq]

Just tested NotoSerifKannada and I can see Kannada numerical are shorter than ASCII numerical, this is true for both hinted and untinted. I checked NotoSansKannada and Kannada numerical height is ok comparing with ASCII numerical

[MayuraVerma]

@nizarsq Wonderful. In recent times, Kannada numbers and ASCII-numbers are both used in texts. Please keep in consistent in height. You can also observe the need for change when currency is put in mix.

In printed texts, Kannada numbers are at x-height, in other words the upper horizontal line of letter ಕ with small overshoot for the curvation.

Tiro Kannada (Murty Kannada) keeps both Kannada numbers at x-height and ASCII numbers with oldstyle figures.

In Noto Sans Kannada, Both Kannada numbers and ASCII numbers are taller compared to the upper horizontal line of letter ಕ. All numbers could have been slightly shorter.

In Noto Serif Kannada, Both Kannada numbers is shorter compared ASCII numbers, currency and there seems to be no overshooting of curves from upper horizontal line of letter ಕ.

There was review of noto serif kannada v 1.
https://github.com/googlei18n/noto-fonts/files/673137/Noto.Serif.Kannada.Review.pdf

This had references to old printed text.

Kannada numbers in version 1 of noto serif kannada was taller. In version 2, it was shortened.
https://github.com/googlei18n/noto-fonts/files/956925/2017-04-03_NotoSerifKannada-ExtensionProposal.pdf

Kannada number height can be slightly taller than the upper horizontal line of letter ಕ (x-height)
They do not have to be at the maximum height ಕೆಲಿಪಿಡೆರೆಳಿವೆರೆ of of the caps-height.
But ASCII numbers, currencies should all be at the same height as kannada numbers.

Preferred solution is Kannada numbers be slightly taller the upper horizontal line of letter ಕ (x-height), currencies and ASCII numbers should be at the same height as Kannada numbers.

Noto sans kannada should also be revisited with this issue.