RE: [jlreq] Quarter Millimeter

> The Q would be about 3/4 pts. (Difference is about 5%).

You're right that converting between pt and mm by authors can cause errors. I meant Q and mm are convertible without errors for authors.


> Is that something that real implementations do,
> or do they work with much higher internal precision?

I'm sorry but I don't understand in what context you're asking this question. If you're asking how browsers implements conversions between mm and pt, I don't know, but I mean the issue is between mm and inch. As long as browsers support mm, Q can be converted to mm without errors.

If you're talking about typographic/graphic systems in general, I suppose they do use higher internal precision to support both mm and pt/inches. Softwares I worked on in the past actually did.


-----Original Message-----
From: Asmus Freytag [mailto:asmusf@ix.netcom.com] 
Sent: Thursday, December 01, 2011 4:30 AM
To: Koji Ishii
Cc: "Martin J. Dürst"; Christoph Päper; public-i18n-cjk@w3.org
Subject: Re: [jlreq] Quarter Millimeter

On 11/30/2011 7:41 AM, Koji Ishii wrote:
> Q is still the most commonly used units in Japanese typography. InDesign supports Q, and all the people I know uses Q in InDesign. I agree that it's a nice addition to JLREQ.
>
> I'm not sure how much it's needed for the CSS Values&  Units though, as, unlike pt, it's easy to transform to millimeters without errors and everyone who knows Q knows it.

The Q would be about 3/4 pts. (Difference is about 5%). If I have an implementation that works its math in quarter points (smallest unit that I've come across in run-of-the-mill software) then that could be your error. Is that something that real implementations do, or do they work with much higher internal precision?
>
>
> Regards,
> Koji
>
> -----Original Message-----
> From: "Martin J. Dürst" [mailto:duerst@it.aoyama.ac.jp]
> Sent: Wednesday, November 30, 2011 8:05 PM
> To: Christoph Päper
> Cc: public-i18n-cjk@w3.org
> Subject: Re: [jlreq] Quarter Millimeter
>
> On 2011/11/30 18:42, Christoph Päper wrote:
>> I’ve read several times that in Japanese typography it is or, at least, was quite common to employ a unit of 0.25 mm, i.e. a quarter millimeter, called ‘q’, (transcribed) キュ or (retranscribed) ‘kyu’, where Western typesetters would use one of the many ‘point’ units. It isn’t mentioned in JLREQ, however.
>>
>> Should it be included here and therefore possibly get considered for CSS Values and Units?
>>
>> Disclaimer: I unsuccessfully proposed its inclusion in CSS several years ago.
> This is just a wild guess, but it may be that this unit is no longer very much in use because PostScript and DTP technology,... were all based on points. If that's the case, it may be good to add a note somewhere to that effect, so that people familiar with history can check it.
>
> Regards,   Martin.
>
>

Received on Wednesday, 30 November 2011 19:52:32 UTC