Faulty ligatures in Adobe PhotoShop

[Anto'nio Martins-Tuva'lkin]

My copy of Photoshop 7 has an interesting image in its (HTML format)
help file, page <1_16_4_13.html> on "Using ligatures and old style
numerals". It shows three examples of «Type with Ligatures option
unselected and selected»: "ct", "fi" and "fh".

The bad part of it is that the ligated characters shown (in the sencond
and third examples) seem to include a long "s" instead of an "f"...
<ty_06.gif> attached for reference.

I note that Adobe Photoshop has OTOH quite deep and (apparently) well
designed support for some relatively complex font manipulations, as f.i.
East Asian width and composing oddities.

-- ____.
António MARTINS-Tuválkin, | ()|
<***@tuvalkin.web.pt> |####|
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[Doug Ewell]

Post by Anto'nio Martins-Tuva'lkin
My copy of Photoshop 7 has an interesting image in its (HTML format)
help file, page <1_16_4_13.html> on "Using ligatures and old style
numerals". It shows three examples of «Type with Ligatures option
unselected and selected»: "ct", "fi" and "fh".
The bad part of it is that the ligated characters shown (in the
sencond and third examples) seem to include a long "s" instead of an
"f"... > <ty_06.gif> attached for reference.

There is no "fh" ligature in Unicode, so Photoshop may have been trying
to substitute the "closest" available ligature to the one you wanted
(which is wrong, of course).

Substituting an unligated ſi (U+017F + U+0069) for fi (U+0066 + U+0069)
makes no sense at all. If the current font doesn't contain an fi
ligature (U+FB01), Photoshop should just leave the combination alone.

-Doug Ewell
Fullerton, California
http://users.adelphia.net/~dewell/



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[Eric Muller]

Post by Anto'nio Martins-Tuva'lkin
The bad part of it is that the ligated characters shown (in the
sencond and third examples) seem to include a long "s" instead of an
"f"... > <ty_06.gif> attached for reference.

Thanks for the report, I’ll forward to the Photoshop guys. By the way,
the font is apparently Adobe Caslon Pro.

Substituting an unligated Å¿i (U+017F + U+0069) for fi (U+0066 + U+0069)
makes no sense at all. If the current font doesn't contain an fi
ligature (U+FB01), Photoshop should just leave the combination alone.

More likely, the image was created in Illustrator or some such, and the
glyph selected manually by the author. I did not check explicitly, but I
am ready to bet a whole lot that the font does the correct thing.

Eric.

[Kent Karlsson]

Doug Ewell wrote:
...

Post by Doug Ewell

Post by Anto'nio Martins-Tuva'lkin
My copy of Photoshop 7 has an interesting image in its (HTML format)
help file, page <1_16_4_13.html> on "Using ligatures and old style
numerals". It shows three examples of «Type with Ligatures option
unselected and selected»: "ct", "fi" and "fh".
The bad part of it is that the ligated characters shown (in the
sencond and third examples) seem to include a long "s" instead of an
"f"... > <ty_06.gif> attached for reference.

There is no "fh" ligature in Unicode,

No, but is is perfectly permissible to ligate f and h anyway, just like you
can (or should) ligate f and j, and g and j (if the glyphs would overlap).

Post by Doug Ewell
so Photoshop may have been trying
to substitute the "closest" available ligature to the one you wanted
(which is wrong, of course).
Substituting an unligated ſi (U+017F + U+0069) for fi (U+0066
+ U+0069)
makes no sense at all. If the current font doesn't contain an fi
ligature (U+FB01), Photoshop should just leave the combination alone.

U+FB01 is a compatibility character that is best avoided to use at all. Formation of
of an f and i ligature should not depend on if the character U+FB01 is supported
or not (though it is likely to be supported if f and i are ligated).

/kent k



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[John Hudson]

Post by Anto'nio Martins-Tuva'lkin
My copy of Photoshop 7 has an interesting image in its (HTML format)
help file, page <1_16_4_13.html> on "Using ligatures and old style
numerals". It shows three examples of «Type with Ligatures option
unselected and selected»: "ct", "fi" and "fh".
The bad part of it is that the ligated characters shown (in the sencond
and third examples) seem to include a long "s" instead of an "f"...
<ty_06.gif> attached for reference.

Whoever made the image probably made a mistake; either that or the font
used has faulty lookups. Photoshop 7 uses OpenType glyph substitution, so
what you are seeing is not character mapping but glyph-space processing.

John Hudson

Tiro Typeworks www.tiro.com
Vancouver, BC ***@tiro.com

You need a good operator to make type. If it were a
DIY affair the caster would only run for about five
minutes before the DIYer burned his butt off.
- Jim Rimmer



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