bugFree UCS Outline Fonts - Bugs: bug #39624, Even more Cyrillic kerning


bug #39624: Even more Cyrillic kerning

Submitted by:  Rosella Capriotti <rosy58>
Submitted on:  Tue 30 Jul 2013 06:49:33 PM UTC  
Category:  character range Severity:  3 - Normal
Item Group:  letter positioning poor Status:  Fix posted
Privacy:  Public Assigned to:  Steve White <Stevan_White>
Open/Closed:  Open Release:  2012-05-03

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Thu 21 May 2015 08:44:25 AM UTC, comment #5:

Well I think for digraph хр, you can found them in the anthem of the Russian Empire, such as Боже, Царя храни!

Hsing-yen He <hammerandsickle>
Sun 08 Feb 2015 07:45:48 PM UTC, comment #4:

Made these changes. In SVN.

Хо (Serif italic faces) The kerning entries letters similar to Х was missing in the Х. Just put it back in.

Хр (Serif normal) There was no kerning entry. Added one, pulled several letters together.

Об (Serif Bold for Serbian) Made a special lookup for these.

њу (Serif normal) Pushed them a bit closer. Any closer and it will look like the у is biting the њ.

These are good catches, Rosella. Pardon the long delay, again.

Steve White <Stevan_White>
Project AdministratorIn charge of this item.
Sun 08 Feb 2015 07:06:17 PM UTC, comment #3:


My apologies! I just noticed that I hadn't responded to this report! I have no explanation, except maybe that I confused the messages with some other report.

Regarding kerning generally: This is very touchy of course, and in large degree a matter of taste.

Practically, I try to balance legibility on modern screens with modern font rendering (Harfbuzz being the main target renderer), with rendering on printed page. Somehow the spacing should appear uniform. It is a psycho-sensory effect, that is very difficult to achieve

Rule of thumb: for most letters in serifed fonts, the serifs should not overlap. If serifs of two letters are adjacent to one another, I put a space about the height of the serif between the letters. When a round part of a letter comes next to a letter with a vertical line, I move them together, but usually not so that one letter intrudes into the serifs of another.

Exceptions are deeply angled letters such as V beside, say, A.
Here the letters have to be moved well into one another's "air space" to avoid a gap appearing between them. I also try to keep a stem-width between any two horizontal stems. And so on...

All that said,

  • Your example in file 28854 (ијс) looks about right to me. The hook on the j has to go beneath the previous letter... in this case, just beneath its serif. The j and the c follow the rule of vertical against round, that a stem's width should be maintained.
  • 28767 (Хо) ... I have to say, the space is more than I like. I'll look at it.
  • 28768 (њу). Well, It follows some rules, namely that stems of the њ should extent no further than serifs of the у. But in this case, maybe it leaves a gap. I'll look at it.
  • 28707 (Об) this is round-to-round. In the normal font, the rule is stem's width. In the bold, it should be closer. I'll play with it.
  • 28709 (Хр) Once again, it follows some rules, which maybe should be bent a little.
  • 28710 (бл) These are as close as I'm comfortable with. There are some letters that just require more air between them than others -- it's the flip-side of making the spacing uniform -- it mustn't be too uniform.


Steve White <Stevan_White>
Project AdministratorIn charge of this item.
Thu 15 Aug 2013 02:58:41 PM UTC, comment #2:

Антиохијског: aren't italic IE, JE and ES too close to each other?

(file #28854)

Rosella Capriotti <rosy58>
Mon 05 Aug 2013 09:39:14 PM UTC, comment #1:

1) Хочилија: too much space between CAPITAL HA and SMALL O, isn't it?
2) Оплемењујући: shouldn't NJE and U be a bit closer? Maybe I'm wrong.

(file #28767, file #28768)

Rosella Capriotti <rosy58>
Tue 30 Jul 2013 06:49:33 PM UTC, original submission:

As per your request, I've opened a new thread concerning Cyrillic kerning.

1. Обнова: this is Bold and the space between CAPITAL LETTER O and SMALL LETTER BE is excessive.
2. облику: I know we've already discussed it in the previous threads, but I think the space between SMALL LETTER BE and SMALL LETTER EL still needs some tweaking: isn't there too much space between them?
3. Хронографија: the space between CAPITAL LETTER HA and SMALL LETTER ER is too great: compare with the tighter space (I think) in the bold style in the section title just above.

Rosella Capriotti <rosy58>


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach Files:

Attached Files
file #28767:  Хомилија.png added by rosy58 (296KiB - image/png)
file #28708:  Обнова.png added by rosy58 (257KiB - image/png)
file #28710:  облику.png added by rosy58 (281KiB - image/png)


Depends on the following items: None found

Items that depend on this one: None found


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  • -email is unavailable- added by hammerandsickle (Posted a comment)
  • -email is unavailable- added by Stevan_White (Posted a comment)
  • -email is unavailable- added by rosy58 (Submitted the item)

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    Follow 11 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2015-02-08 Stevan_White StatusProceeding => Fix posted
    2015-02-08 Stevan_White Categoryoverall font problem => character range
        Item Groupcharacter substitution issue => letter positioning poor
        StatusNone => Proceeding
        Assigned toNone => Stevan_White
    2013-08-15 rosy58 Attached File- => Added Антиохијског.png, #28854
    2013-08-05 rosy58 Attached File- => Added Хомилија.png, #28767
        Attached File- => Added Оплемењујући.png, #28768
    2013-07-30 rosy58 Attached File- => Added Обнова.png, #28708
        Attached File- => Added Хронографија.png, #28709
        Attached File- => Added облику.png, #28710

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