Why do you want to convert TTF to OTF in the first place? If you don’t add OpenType features, there is no reason to convert to an OpenType format. And even if you add OpenType features, there is no need to switch from TrueType outlines to PostScript outlines. (Which is suggested by using the .otf suffix).

See also: http://opentype.info/blog/2010/07/31/opentype-myths-explained/

Dear Ralf H.

I do thank you for your contribution regarding the myths about Opentype Fonts. The same problem is also encountered with Truetype fonts when using Adobe Photoshop. It is not a problem of the font type.

I have found through reading in the Internet some facts about opentype fonts. I have read that "Opentype should be far better at handling fonts that contain variant glyphs of the same characters, particularly Hindu fonts where individual letters often combine into complex ligatures. Various high-end features in these fonts currently only work in high-end desktop publishing software."

You can find more about the benefits of Opentype/CFF over Truetype:
http://blogs.adobe.com/typblography/2010/12/the-benefits-of-opentypecff-...

@ashosaki – Truetype is already a subset of OpenType, namely TT-flavoured OpenType. The other subset is PS-flavoured or CFF-flavoured OpenType.

Just slap on the OT features you want plus a dummy DSIG (Digital SIGnature) for the WinXP users, and you're sitting on the top of the world.

Té, somehow I'm not convinced that will make any font suddenly brimming with "variant glyphs of the same characters, particularly Hindu fonts where individual letters often combine into complex ligatures".

You can add one more myth to the list: converting an existing Font into Opentype will not magically add all of those yummy features.

Mebbe not, but it does mean that changing outlines from TT to PS is not necessary.

No, it's the OP who understood just about every important detail the wrong way around.

It's not the font format per se that makes these special options available, what counts is which features are defined in the font to begin with.

(But leaving his mistaken expectations for what they are: the one thing that's missing from this discussion so far is an explanation for why his attempt to simply convert from one type to another failed.
It might be as simple as that he left the original fonts installed as well -- invalidating all font caches etc.)

… and just opening a TTF and directly generating a (CFF-flavoured) OTF from that is not really a proper conversion. I would expect a lot of problems with such a font.

All comments are good regarding the TTF and OTF. Unfortunately, no one of you told me about the problem that I encounter with Adobe Photoshop and other Adobe programs.

The most important question, why do I have troubles when I use my fonts with Adobe Photoshop and other related software? You can get more about these problem through the attached photos.

Thank you for your expected technical help.

Ash ...

The most important question, why do I have troubles when I use my fonts with Adobe Photoshop and other related software?

This was my answer:
… and just opening a TTF and directly generating a (CFF-flavoured) OTF from that is not really a proper conversion. I would expect a lot of problems with such a font.

From what I read, you just open a TrueType-based font and directly generate a PostScript-based OTF font from that. Those are different formats and you need to take care of converting TT to PS outlines, correct path directions, convert the hinting and so on. And as we have said before: there is not even a reason to do all this.

Windows XP will only accept a TT-flavoured OpenType font as OpenType if it has a digital signature (DSIG).

If these Adobe products won't accept TrueType or TT-flavoured OpenType fonts, they are FUBAR. Period.

In short, do not convert between TT and CFF unless you must. There are just too many pits, traps and grues in the way.

Do the errors still appear in Photoshop CS and CS2 after uninstalling your converted fonts? If not, that would suggest an issue with the fonts which would be difficult (and in this case rather pointless) to diagnose. If the errors do persist, you can try clearing the font caches by searching your system for “adobefnt*.lst” and deleting those files.

why do I have troubles when I use my fonts with Adobe Photoshop and other related software?

Perhaps because the fonts you made are technically defected? Run them through MS Font Validator.