I am working on a project that requires precise placement of a font for LASER engraving. Specifically centering a font's cap height on a button for centered text.
My question is, where in the TTF tables is the cap height stored?
I use Font Creator currently, but I know from past experience that Font Lab uses cap height too. So, I assume that this information is stored within the font and is not just pulled by Font Creator for the "H" height (Or maybe it is???).
I know how to adjust the cap height in the metrics tab, but my programmer can't find a way to access the Cap Height information directly from the TTF file. I can certainly give them the values for the fonts that I create, but I need a method that works with any font not just our custom fonts. I know that the Right Side Bearing isn't stored directly in the font, but is a calculated value using the Glyph width, Left Side Bearing, and Advance Width. Is that cap height also a calculated value? If so, how can I do that calculation from the font tables.
I know this might be more of an API question, but I need to point them in the right direction so that they can use my fonts.
Thanks!!!
CAP Height Metric Location in TTF File
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Re: CAP Height Metric Location in TTF File
Thanks Erwin,
Do I need to change a setting to have this value included in my font export? My font OS/2 table seems to have everything except the sCapHeight value:
'OS/2' Table - OS/2 and Windows Metrics
---------------------------------------
'OS/2' version: 3
xAvgCharWidth: 559
usWeightClass: 400 'Normal'
usWidthClass: 5 'Medium'
fsType: 0
ySubscriptXSize: 650
ySubscriptYSize: 600
ySubscriptXOffset: 0
ySubscriptYOffset: 75
ySuperscriptXSize: 650
ySuperscriptYSize: 600
ySuperscriptXOffset: 0
ySuperscriptYOffset: 350
yStrikeoutSize: 50
yStrikeoutPosition 310
sFamilyClass: 0 subclass = 0
PANOSE:
Family Kind: 2 'Text and Display'
Serif Style: 11 'Normal Sans'
Weight: 6 'Medium'
Proportion: 4 'Even Width'
Contrast: 2 'None'
Stroke: 2 'Gradual/Diagonal'
Arm Style: 2 'Straight Arms/Wedge'
Lettreform: 2 'Normal/Contact'
Midline: 2 'Standard/Trimmed'
X-height: 4 'Ducking/Standard'
Unicode Range 1( Bits 0 - 31 ): 0xa00002af
Unicode Range 2( Bits 32 - 63 ): 0x5000205b
Unicode Range 3( Bits 64 - 95 ): 0x00000000
Unicode Range 4( Bits 96 - 128 ): 0x00000000
achVendID: 'LINO'
fsSelection: 0x0040 'Regular '
usFirstCharIndex: 0x0020
usLastCharIndex: 0xfb04
sTypoAscender: 714
sTypoDescender: -198
sTypoLineGap: 100
usWinAscent: 973
usWinDescent: 248
CodePage Range 1( Bits 0 - 31 ): 0x20000097
CodePage Range 2( Bits 32- 63 ): 0x00000000
Do I need to change a setting to have this value included in my font export? My font OS/2 table seems to have everything except the sCapHeight value:
'OS/2' Table - OS/2 and Windows Metrics
---------------------------------------
'OS/2' version: 3
xAvgCharWidth: 559
usWeightClass: 400 'Normal'
usWidthClass: 5 'Medium'
fsType: 0
ySubscriptXSize: 650
ySubscriptYSize: 600
ySubscriptXOffset: 0
ySubscriptYOffset: 75
ySuperscriptXSize: 650
ySuperscriptYSize: 600
ySuperscriptXOffset: 0
ySuperscriptYOffset: 350
yStrikeoutSize: 50
yStrikeoutPosition 310
sFamilyClass: 0 subclass = 0
PANOSE:
Family Kind: 2 'Text and Display'
Serif Style: 11 'Normal Sans'
Weight: 6 'Medium'
Proportion: 4 'Even Width'
Contrast: 2 'None'
Stroke: 2 'Gradual/Diagonal'
Arm Style: 2 'Straight Arms/Wedge'
Lettreform: 2 'Normal/Contact'
Midline: 2 'Standard/Trimmed'
X-height: 4 'Ducking/Standard'
Unicode Range 1( Bits 0 - 31 ): 0xa00002af
Unicode Range 2( Bits 32 - 63 ): 0x5000205b
Unicode Range 3( Bits 64 - 95 ): 0x00000000
Unicode Range 4( Bits 96 - 128 ): 0x00000000
achVendID: 'LINO'
fsSelection: 0x0040 'Regular '
usFirstCharIndex: 0x0020
usLastCharIndex: 0xfb04
sTypoAscender: 714
sTypoDescender: -198
sTypoLineGap: 100
usWinAscent: 973
usWinDescent: 248
CodePage Range 1( Bits 0 - 31 ): 0x20000097
CodePage Range 2( Bits 32- 63 ): 0x00000000
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Re: CAP Height Metric Location in TTF File
No. It is included, but it seems your software/tools fail to reveal it.dmills wrote:Do I need to change a setting to have this value included in my font export?
Re: CAP Height Metric Location in TTF File
The x and cap heights are listed in the table right after the code page listing which appears is where your's stops. At least with the tool I am using that is where they are found...
Mike
Mike
Re: CAP Height Metric Location in TTF File
Hi Mike and Erwin,
Thanks so much for your help. I will pass this on in my meeting with the programmer today.
Mike, would you mind sharing the tool that you are using. Is that allowed?
Thanks,
DAniel
Thanks so much for your help. I will pass this on in my meeting with the programmer today.
Mike, would you mind sharing the tool that you are using. Is that allowed?
Thanks,
DAniel
Re: CAP Height Metric Location in TTF File
DTL's OTMaster. There's a free version. I use it for a couple of reasons having to do when I was helping a company implement some features in their software having to do with fonts.
Mike
Mike