In case anyone is interested, attached is the same font rendered in both .ttf and .otf versions using KDE Plasma Qt5 desktop.
A subtle difference, yet I guess the otf is more "correct". On May 4 2021, at 11:49 am, Allan Sandfeld Jensen <li...@carewolf.com> wrote: > I would leave it at 1.0. Not sure what it is supposed to affect now though. It > used to do something directly to the screen (to counter screen glare in bright > sunlight for instance). Now it seems unresponsive/dead to me though. You > should probably ask KDE/Plasma. > > Allan > On Dienstag, 4. Mai 2021 12:33:54 CEST Rob wrote: > > Perhaps it's outside the scope of this mailing list, but in that case should > > I calibrate my monitor to a gamma of 1.7 to get the best text rendering? > > > > On the other hand, this link indicates that a relative system gamma of "1.0" > > is equivalent to 2.2 on windows, so perhaps a monitor calibrated to 2.2 is > > actually correct. > > https://docs.kde.org/stable5/en/kgamma5/kcontrol/kgamma5/index.html > > (https://link.getmailspring.com/link/E256C570-0F27-4E81-8AF8-8EF045BB93CC@g > > etmailspring.com/0?redirect=https%3A%2F%2Fdocs.kde.org%2Fstable5%2Fen%2Fkgam > > ma5%2Fkcontrol%2Fkgamma5%2Findex.html&recipient=bGludXhAY2FyZXdvbGYuY29t) > > On May 4 2021, at 11:29 am, Allan Sandfeld Jensen <li...@carewolf.com> > wrote: > > > Qt5 uses a gamma of 1.7 for text rendering on X11. > > > > > > The KDE gamma slider is an effect on the whole screen, not how elements > > > are > > > blended together inside singular apps. > > > > > > Not sure there is any other place we could read an expected gamma from on > > > Linux, the only other source is using real gamma from monitors EDID, but > > > that would result in a much higher gamma and lighter text, probably not > > > fitting user expectations. Though perhaps we ought to have a switch > > > allowing users to use real numbers instead of simulating traditional > > > mistakes. > > > > > > Allan > > > > > > On Dienstag, 4. Mai 2021 12:20:38 CEST Rob wrote: > > > > Ok, I understand. > > > > > > > > I am using KDE so I guess qt5 is responsible for gamma correction (and > > > > probably assumes monitor is 2.2). > > > > > > > > On May 4 2021, at 10:53 am, Werner LEMBERG <w...@gnu.org> wrote: > > > > > > But if it is correcting the gamma it must assume that my monitor has > > > > > > a certain gamma? > > > > > > > > > > As Allan has written: FreeType does *not* interact with gamma at all! > > > > > If you want to be very precise you could say that FreeType doesn't > > > > > return bitmaps with color or grayscale pixels. Instead, it returns > > > > > *coverage* values (i.e., how much area of a pixel is covered by ink), > > > > > and the calling graphics library has to further process it. This > > > > > includes application of gamma correction. > > > > > > > > > > > > > > > Werner >
