Incorrect text rendering in GDI mode

[QZMTCH]

Definitely yes.

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There is no problem - there is only one correct gamma value, the rest are wrong.
If you're a calculator developer and some users want 2+2=5, would you do that?
You can use font gamma tester.
Firefox show correct gamma, Cent browser not:

Firefox on the left? so switch the directwrite flag to enable and you will get the same rendering
what is the problem? nothing needs to be changed, everything is already there
on the right screenshot, the test gives the correct answer ClearType enabled: FAIL set fonts in windows, you can try this tweak

Code:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RegEdit]
"FontFace"="Tahoma"
"FontSize"=dword:00000050

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts]
"Segoe UI (TrueType)"=""
"Segoe UI Bold (TrueType)"=""
"Segoe UI Bold Italic (TrueType)"=""
"Segoe UI Italic (TrueType)"=""
"Segoe UI Light (TrueType)"=""
"Segoe UI Semibold (TrueType)"=""

[HKEY_CURRENT_USER\Control Panel\Desktop]
"FontSmoothingType"=dword:00000001

[HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics]
"CaptionFont"=hex:F5,FF,FF,FF,00,00,00,00,00,00,00,00,00,00,00,00,90,01,00,00,\
00,00,00,01,00,00,00,00,54,00,61,00,68,00,6F,00,6D,00,61,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
"IconFont"=hex:F5,FF,FF,FF,00,00,00,00,00,00,00,00,00,00,00,00,90,01,00,00,00,\
00,00,01,00,00,00,00,54,00,61,00,68,00,6F,00,6D,00,61,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
"MenuFont"=hex:F5,FF,FF,FF,00,00,00,00,00,00,00,00,00,00,00,00,90,01,00,00,00,\
00,00,01,00,00,00,00,54,00,61,00,68,00,6F,00,6D,00,61,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
"MessageFont"=hex:F5,FF,FF,FF,00,00,00,00,00,00,00,00,00,00,00,00,90,01,00,00,\
00,00,00,01,00,00,00,00,54,00,61,00,68,00,6F,00,6D,00,61,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
"SmCaptionFont"=hex:F5,FF,FF,FF,00,00,00,00,00,00,00,00,00,00,00,00,90,01,00,\
00,00,00,00,01,00,00,00,00,54,00,61,00,68,00,6F,00,6D,00,61,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
"StatusFont"=hex:F5,FF,FF,FF,00,00,00,00,00,00,00,00,00,00,00,00,90,01,00,00,\
00,00,00,01,00,00,00,00,54,00,61,00,68,00,6F,00,6D,00,61,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00

(I have the same as in the second screenshot, by the way, both with and without directwrite flag, and in firefox the same thing)