On 30/07/2007, at 7:34 AM, Don Jungk wrote:
> Text drawn at a text size of, say 48 point, should measure 48
> points from the
> bottom of a descender to the top of an ascender.
<http://developer.apple.com/documentation/Carbon/Conceptual/
ATSUI_Concepts/atsui_chap2/chapter_2_section_6.html>
"Point size indicates the size of a font’s glyphs as measured from
the baseline of one line of text to the baseline of the next line of
single-spaced text."
The diagrams on that page and the only diagrams I've been able to
find in the PostScript manuals talk more about a Bounding Box for a
glyph
" The bounding box of a glyph is the smallest rectangle that entirely
encloses the drawn parts of the glyph."
the book ".Net Graphics and Printing" says on p131
"In theory, the point-size of a font is the measurement of the height
of the traditional block of type. It can often be approximated by the
distance from the top of the tallest letter in the font to the bottom
of the lowest descender.'...p132 "In Actuality, the point size of
most digital fonts does not provide the precise measurement...maybe
larger depending on the specific font".
Hopefully that adds to the confusion.
Me, I'd stick with the line-spacing argument. How that actually
translates glyph-wise depends on the individual glyph in the
individual font.
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