underscore (U+005F) not visible in .pdf when using TTF

adobe-fonts / source-serif

Typeface for setting text in many sizes, weights, and languages. Designed to complement Source Sans.

https://adobe-fonts.github.io/source-serif

SIL Open Font License 1.1

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underscore (U+005F) not visible in .pdf when using TTF #44

Closed theovanh closed 5 years ago

theovanh commented 5 years ago

Underscore (ascii 5F) is not visible when a document in Word 2007 is saved as .pdf Other fonts do not have this problem. The character '5F' is present in the .pdf but not visible. Windows 10.

frankrolf commented 5 years ago

That’s odd. Which version of the font are you using? OTF or TTF? At first glance it looks similar to this problem: https://github.com/adobe-fonts/source-sans-pro/issues/154

Would like to get to the bottom of this, but I don’t know if there’s anything one can do in the font files. Please try the TTF if you are using OTF, and vice versa.

frankrolf commented 5 years ago

How is the PDF generated? You may want to try using the Adobe PDF “printer”: https://helpx.adobe.com/acrobat/using/print-to-pdf.html

theovanh commented 5 years ago

I made the .pdf by Save as… in Word 2007. So it is a Word document saved by the pdf-save function in Word 2007.

Striking is that the omission of the display of the underscore (ascii 5F) only happens with the Source Serif Pro font as demonstrated by the example that I attached. I am disappointed because I like the font very much.

As I explained, the character is actually present in the .pdf. This is demonstrated by selecting a piece of text in the .pdf , then copy and paste into Notepad where the underscore shows up.

Opening the .pdf with Firefox, Chrome, MS Edge makes no difference. None of these shows the underscore, not with Source Serif Pro or Source Serif Pro Semibold.

There must be something in the code of the font.

I do hope , this bug can be removed.

Success, hope to hear from you,

Theo van Herwijnen

theovanh commented 5 years ago

Frank,

Quick answer: I use the TTF. Tomorrow I will test the OTF.

Regards,

Theo

theovanh commented 5 years ago

The font file is version 2.007; hotconv 1.0.1.08;makeotfexe 2.5.65593. I believe the problem is rather with the Reader Reader XI, version 11.0.23. Upgraded to Reader DC 2019.010.20064 and repeated the exercise : underscore is carried through into Notepad but not shown in Reader DC:

frankrolf commented 5 years ago

@theovanh Would you mind trying to write the PDF in another way – not through “save as…” but using the Adobe PDF printer. I’d be curious to know the result here.

theovanh commented 5 years ago

I do not have the Acrobat virtual printer available. I printed with 'cutePDFWriter' which gave me a .pdf where the underscores are visible in Reader DC. When 'printed' from Word with 'Microsoft Print to PDF' the result did NOT show the underscore of Source Serif Pro but copy/paste into Notepad demonstrated that they are present (as in the test above). Probably the 'MS Print to PDF' uses the same function as its 'Save as ..' Conclusion: the problem is caused by the Word 2007 PDF software which makes Reader DC refuse to show the 5F underscore in font Source Serif Pro.

theovanh commented 5 years ago

Frank,

Good morning.

I posted on github my latest findings. Attached the 2 pdf’s. I noticed that there are significant differences in the Properties/Fonts of the 2 pdf’s.

Succes,

Theo

frankrolf commented 5 years ago

Dear Theo, happy new year! Unfortunately I did not personally receive the PDFs you promised (all messages are re-routed through GitHub and attachments removed) Could you please send them again directly at fgriessh@adobe.com – thank you!

frankrolf commented 5 years ago

Also reproduced, analog to https://github.com/adobe-fonts/source-sans-pro/issues/154#issuecomment-451433797:

Step-by-step:

install Source Serif Pro Regular 2.007 TTF
create new Word document in MS Word 2016 on Windows 10.
paste the text Function __construct($first_name, $last_name)

option 1

File → Save as… → PDF result: underscores are missing from PDF

option 2

File → Print → Microsoft Print to PDF result: underscores are missing from PDF

option 3

File → Save as Adobe PDF … no text whatsoever in PDF

workaround

All above options work properly when using the equivalent OTF font.

miguelsousa commented 5 years ago

Found the problem by using MS Font Validator. The maxComponentElements value in the maxp table is set to zero (instead of 3).

This was caused by an oversight in the ttfcomponentizer https://github.com/adobe-type-tools/afdko/issues/710

miguelsousa commented 5 years ago

Fixed in this release https://github.com/adobe-fonts/source-serif-pro/releases/tag/2.010R-ro%2F1.010R-it