DisplayCAL News

Added in this release:

• [Feature] Preliminary experimental Wayland support under GNOME
  3 using colord (requires ArgyllCMS 2.1 or newer as well).
  Caveats do apply:
  • Window placement and ordering is completely up to the
    compositor under Wayland. There is generally no way for an
    application to place its own windows at specific relative
    locations or z-orders. As a result of this, the measurement
    window cannot stay always on top or be automatically centered.
  • Extra care needs to be taken that other windows are not placed
    on top.
  • Video card gamma table (videoLUT) access is handled by colord.
    Some functions like viewing current videoLUT contents may not
    be available.
  • The measurement window color depth is limited to 8 bits per
    channel per pixel (but dithering is used to achieve a higher
    effective color depth).
  • The measurement window may be subject to desktop-wide color
    management in upcoming versions of Wayland (although the
    display device is inhibited during measurements via the
    org.freedesktop.ColorManager.Device[1] D-Bus API which should
    prevent this, and as a fallback a linear calibration sRGB
    profile is temporarily installed during measurements if the
    D-BUs API is unavailable, which should result in an identity
    transform, i.e. effectively no color management, as well as
    linear video card gamma tables).
  • Application support for color management under Wayland via
    colord still seems to lacking[2] (although the list may well be
    out-of-date).
  • Only tested under GNOME 3 (Fedora 30, Ubuntu 19.04). Support
    for other desktop environments will need to be implemented
    separately until Wayland gains a color management and
    calibration/profiling protocol.
• [Feature] LG OLED 3D LUT format.

[1] https://www.freedesktop.org/software/colord/gtk-doc/Device.html
[2] https://www.freedesktop.org/software/colord/faq.html#application-support

Changed in this release:

• [Enhancement] If the currently used ArgyllCMS version is not a
  standard version, but also not a beta, do not offer to switch
  to an installed official stable version if it's otherwise the
  same version number.
• [Enhancement] Include Quantum Dot LED (Samsung QLED Q9F)
  spectral sample colorimeter correction when importing for i1
  Display Pro and ColorMunki Display (sourced from community
  colorimeter corrections database).
• [UI] (Debian, Fedora, Ubuntu) Use wxPython Phoenix if
  installed.
• Prisma, Resolve: Set pattern generator background color to
  pattern color if using fullscreen patterns.

Fixed in this release:

• [Moderate] UnicodeDecodeError when a CCSS file contains unicode
  characters in the display device description (regression of a
  change in DisplayCAL 3.8 to use localized technology
  descriptions, SVN revision r5810).
• [Minor] APL calculation for Prisma and Resolve pattern
  generators was off by a few percent depending on pattern area
  and current pattern color.
• [Minor] Quick reporting on calibrated or uncalibrated display
  did not try to detect output levels if set to “Auto”.
• [Trivial] More gracefully deal with faulty tags in ICC profiles
  (fixes ICC profile information unhandled exception for colord-
  created profiles with malformed targ tags).
• [Trivial] [UI] Correctly update the audio button state on
  progress dialogs when changed on a previous window.
• [Cosmetic] [UI] Various minor potential rendering glitches.
• [Cosmetic] [UI] Add work-arounds for various Wayland-related
  wxPython rendering quirks and bugs (e.g. spacing around
  windows, popup menu placement).
• [Trivial] Try to work around sporadic colord profile
  installation quirks (“The profile was not added in time”).