Bug 399107

Summary:	micro symbol (mu) missing
Product:	[Applications] okular	Reporter:	Kamesh <kamesh419>
Component:	PDF backend	Assignee:	Okular developers <okular-devel>
Status:	RESOLVED NOT A BUG
Severity:	normal	CC:	aacid, luigi.toscano
Priority:	NOR
Version First Reported In:	1.5.1
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	attachment showing the issue fonts in the pdf fonts 2 fonts 3 fonts 4

Description Kamesh 2018-09-26 14:18:42 UTC

Created attachment 115249 [details]
attachment showing the issue

SUMMARY
micro symbol (mu) missing in the pdf.

STEPS TO REPRODUCE
1. open pdf from http://www.ti.com/lit/ug/spruhz6j/spruhz6j.pdf
2. Scroll to page 5603
3. the mu symbol in the table is missing. Where as firefox seems to be display it properly. 

OBSERVED RESULT
The mu symbol in the table is missing. 

EXPECTED RESULT
Should be able to display the symbol. I did not check for other Greek alphabets. 

SOFTWARE VERSIONS
(available in About System)
KDE Plasma Version: 5.13.5
KDE Frameworks Version: 5.50.0
Qt Version: 5.11.1

ADDITIONAL INFORMATION

I am on KDE neon 5.13

Comment 1 Luigi Toscano 2018-09-26 14:32:50 UTC

I can see the mu symbol (500 μs, etc).

This is most likely a font replacement problem, outside the domain of Okular. Not all fonts in the document are embedded. Apart from Embededded fonts, which fonts are used for the document in your case? (see File->Properties->Fonts)? Here I have roughly:
Helvetica, almost all Arial variants -> Arimo (some variant of it)
Times New Roman,Bold -> Tinos-Bold
ArialMT and CourierNewPSMT -> DejaVuSans

Comment 2 Kamesh 2018-09-28 11:38:02 UTC

Created attachment 115292 [details]
fonts in the pdf

Comment 3 Kamesh 2018-09-28 11:38:19 UTC

Created attachment 115293 [details]
fonts 2

Comment 4 Kamesh 2018-09-28 11:38:32 UTC

Created attachment 115294 [details]
fonts 3

Comment 5 Kamesh 2018-09-28 11:38:49 UTC

Created attachment 115295 [details]
fonts 4

Comment 6 Kamesh 2018-09-28 11:39:49 UTC

I am attaching some more screenshots which details all the fonts in the document.

Comment 7 Luigi Toscano 2018-09-28 12:06:55 UTC

99% is a problem with the TeX Gyre Heros font. Please try to remove it. The package name is called fonts-texgyre.

Comment 8 Kamesh 2018-09-28 12:44:25 UTC

Perfect. That is it. I can now see the mu symbol. Thank you so much. 

Strange to see that an existing obscure font can cause a missing font issue.