[Poppler-bugs] [Bug 100869] New: poor type 1c font rendering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100869

            Bug ID: 100869
           Summary: poor type 1c font rendering
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: gpoo at gnome.org

Created attachment 131121
  --> https://bugs.freedesktop.org/attachment.cgi?id=131121&action=edit
PDF Test case

This was reported in https://bugzilla.gnome.org/show_bug.cgi?id=776924

The following pdf document is being rendered rather ugly in evince:

http://www.scottaaronson.com/papers/pnp.pdf

All fonts are embedded. They're all type 1c fonts.

$ pdffonts pnp.pdf 
name                                 type              encoding         emb sub
uni object ID
------------------------------------ ----------------- ---------------- --- ---
--- ---------
VXEZKP+CMSS17                        Type 1C           Builtin          yes yes
no       4  0
YDPTNV+CMR12                         Type 1C           Builtin          yes yes
no       5  0
JLCEZQ+CMR17                         Type 1C           Builtin          yes yes
no       6  0
NUVJJI+CMSY8                         Type 1C           Builtin          yes yes
yes      7  0
VBIHCP+CMBX10                        Type 1C           Builtin          yes yes
no       8  0
CXZLTS+CMR10                         Type 1C           Builtin          yes yes
yes      9  0
JGIYMZ+CMSS10                        Type 1C           Builtin          yes yes
yes     10  0
AGGZPP+CMR7                          Type 1C           Builtin          yes yes
no      11  0
RGQKMS+CMSY10                        Type 1C           Builtin          yes yes
yes     12  0
BYIFKE+CMBX12                        Type 1C           Builtin          yes yes
no      13  0
FNGYIT+CMR8                          Type 1C           Builtin          yes yes
yes     15  0
JFBFYB+CMSY6                         Type 1C           Builtin          yes yes
yes     32  0
OBXTKK+CMR9                          Type 1C           Builtin          yes yes
yes     33  0
GVHKBA+CMTI10                        Type 1C           Builtin          yes yes
no      87  0
RVPORJ+CMMI10                        Type 1C           Builtin          yes yes
yes     89  0
JKFOWN+CMSS12                        Type 1C           Builtin          yes yes
no      93  0
KIISBX+CMR6                          Type 1C           Builtin          yes yes
yes     99  0
WWJJES+CMMI9                         Type 1C           Builtin          yes yes
yes    100  0
DRXVBH+CMSS9                         Type 1C           Builtin          yes yes
no     101  0
IWKPFB+CMMI8                         Type 1C           Builtin          yes yes
yes    106  0
IYGFKD+CMMI6                         Type 1C           Builtin          yes yes
yes    110  0
SGXEVV+CMTI9                         Type 1C           Builtin          yes yes
no     129  0
DNNGNS+CMEX9                         Type 1C           Builtin          yes yes
yes    131  0
FPKZIJ+CMSY9                         Type 1C           Builtin          yes yes
yes    132  0
DOOAXC+CMSS8                         Type 1C           Builtin          yes yes
no     170  0
OLTLXQ+CMCSC10                       Type 1C           Builtin          yes yes
no     179  0
JXRWPD+CMEX10                        Type 1C           Builtin          yes yes
yes    188  0
KSYIAZ+CMEX7                         Type 1C           Builtin          yes yes
no     224  0
UROALT+CMMI5                         Type 1C           Builtin          yes yes
no     228  0
SKNWGA+MSBM10                        Type 1C           Builtin          yes yes
yes    239  0
PFOPPM+CMSY5                         Type 1C           Builtin          yes yes
no     310  0
EFHBMR+CMR5                          Type 1C           Builtin          yes yes
no     311  0
PLAHEP+CMEX8                         Type 1C           Builtin          yes yes
no     690  0
UEHLMU+MSBM7                         Type 1C           Builtin          yes yes
no     852  0

I wonder how the embedded pdf viewer of firefox can do a better job with this
document than evince. Most other pdf documents look better in evince.

By ugly the reporter means:

So here are a couple of screenshots. As you can see evince has the lowest font
rendering quality, because it's blurry and the stroke width is not concise
(especially when it comes to the equal sign in the headline).

The font rendering of the internal pdf viewer of firefox also suffers from
being blurry, but at least the stroke width is more concise.

I also added some screenshots taken under macOS. They are not blurry, but the
resolution is also much higher. So it's more like a reference.
Comparing evince's font rendering in the pdf with the font rendering in the
outline window on the left, you can see that it is very well possible to get a
better result with the lower linux resolution.

And it's not like I was searching for a zoom factor where evince has problems.
Sure, the quality might improve with other zoom factors, but it also declines
with others as well. In the end the zoom factor cannot "fix" the font rendering
quality; the font rendering is still clearly better in firefox when
"optimizing" the zoom factor in both applications.

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