Category Archives: General

DisplayCAL 3.6.1 released

Added in this release:

  • [Feature] Adjustable hue preservation (values less than 100% will gradually hue shift very bright and saturated redorange/orange/yellowgreen hues to a more yellowish tone, preserving more saturation and detail) for HDR SMPTE 2084 3D LUTs with roll-off tonemapping (default 50%).
  • [Feature] Ability to set a calibration target luminance by measuring the ambient light level.
  • [Feature] Verification tab: Hold the “alt” key on your keyboard to create a profile or device link (3D LUT) self check report instead of a measurement report.
  • [Enhancement] DCI P3 D65 profile for use as 3D LUT source colorspace or measurement report simulation profile.

Changed in this release:

  • [Enhancement] Increased the default number of patches for the madVR HDR preset back to 425.
  • [Enhancement] HDR 3D LUT SMPTE 2084 tonemapping: Restored near black tone reproduction for displays with non-zero black level and output offset less than 100% to pre-v3.6 values.
  • [Enhancement] Improved HDR 3D LUT SMPTE 2084 tonemapping speed.
  • [Enhancement] Improved HDR 3D LUT accuracy for colorimetric rendering intents.
  • [Enhancement] Increased default display update delay for Resolve preset to 1000 ms.
  • [Enhancement] Quantize Autodesk/Kodak (.3dl) 3D LUT values by always rounding up (match the format specification in the Lustre user guide).
  • [Enhancement] Limit the number of concurrent worker processes depending on system memory to avoid swapping.
  • [Enhancement] Always normalize CGATS data to Y = 100 when processing files not created by DisplayCAL.
  • [Enhancement] Get the black level for computation of 3D LUT or verification target tone curves from the embedded characterization data if a lookup through the display profile returns zero (makes e.g. Rec. 1886 work properly in that case).
  • [Enhancement] Synthetic ICC profile creator: Increase number of decimal digits for black level to 6 and do not clamp to 16-bit integer values to offer more fine grained control.
  • [Enhancement] Linux: Use configured XDG “well known” user directories (currently only used to determine the localized name of the “Downloads” directory).
  • [UI] Moved HDR 3D LUT SMPTE 2084 tonemapping luminance/saturation/hue preservation controls to advanced options (hidden by default).

Fixed in this release:

  • [Moderate] madVR 3D LUT generation via the main application: When using a non-standard source colorspace whitepoint (by setting a calibration whitepoint target different from the source colorspace’s original whitepoint, e.g. not using DCI white for DCI P3), non-standard values for input primaries and whitepoint were written to the 3D LUT header, madVR 3D LUT slot auto-detection for installation did not work if the source colorspace was not Rec. 709, and color conversion was affected if the 3D LUT was not installed via the madVR API (i.e. by not clicking the “Install 3D LUT” button, but choosing the 3D LUT manually in madVR’s settings).
  • [Minor] Downloads within DisplayCAL failed if the download directory didn’t exist (regression of changes made in DisplayCAL 3.5, SVN revision 5081).
  • [Minor] HDR 3D LUT SMPTE 2084 tonemapping for non-Rec. 2020 source colorspaces did not work correctly (Rec. 2020 was assumed despite different choice).
  • [Minor] Standalone 3D LUT maker: Don’t unexpectedly switch to the source profile’s gamma for simple gamma + matrix source profiles (e.g. DCI P3) when creating a 3D LUT.
  • [Minor] Profile loader (Windows): Catch errors in case of a corrupted Windows registry.

DisplayCAL 3.6 released

Added in this release:

  • [Feature] Adjustable weighting between luminance and saturation preservation for HDR SMPTE 2084 3D LUTs with roll-off tonemapping.
  • [Feature] Option to adjust the roll-off for HDR SMPTE 2084 3D LUTs with roll-off tonemapping when the mastering display peak luminance is below 10000 cd/m² (previous behavior with the introduction of BT.2390-2 was to always adjust, the new default behavior is don’t adjust).

Changed in this release:

  • [Enhancement] Improved HDR 3D LUT SMPTE 2084 roll-off tonemapping to eliminate possible over-darkening in rolled-off highlights due to luminance reduction related effects.
  • [Enhancement] Removed HDR 3D LUT SMPTE 2084 roll-off tonemapping allowance for hue shifts in rolled-off highlights.
  • [Enhancement] Increased HDR 3D LUT SMPTE 2084 default target peak luminance to 480 cd/m² (makes BT.2390 roll-off leave 0-100 cd/m² alone).
  • [Enhancement] Use extended model for HDR 3D LUT Hybrid-Log Gamma (HLG) display gamma adjustment described in BT.2390-4.
  • [Enhancement] Do not create PCS-to-device tables for synthetic HDR SMPTE 2084 profiles with roll-off tonemapping as they are meant purely as source profiles.
  • [Enhancement] Only enable the visual whitepoint editor button if the whitepoint target is set to chromaticity coordinates.
  • [UI] Keep dropdowns with only one choice enabled.
  • [Cosmetic] Catch any madTPG connection errors to show a nicer error dialog without a traceback.
  • [Trivial] Do not update the profile description when increasing the effective resolution of an existing profile’s PCS-to-device tables.
  • [Trivial] Testchart editor: Only limit the view to six decimal digits, not the underlying data.

Fixed in this release:

  • [Minor] Confirm instrument placement when madTPG is not fullscreen.
  • [Minor] Creating synthetic grayscale profiles with HLG tone response did not work correctly.
  • [Trivial] Set allowed filetypes for selecting files when importing 3rd party software colorimeter corrections to “any”.
  • [Trivial] Mac OS X: Updated bundled Python to 2.7.15 which includes a recent version of OpenSSL (fixes SSL connection errors due to more recent server-side encryption when using the standalone application bundles).
  • [Trivial] Mac OS X: Restored correct BundleId for application bundles.
  • [UI] Linux (GTK3 under Wayland): Explicit refresh/update needed for ClientDC (fixes graphs not updating until the window is resized).

DisplayCAL 3.5.3 released

Added in this release:

  • [Feature] Rudimentary ICCv4 profile autoconversion support (only matrix profile types).
  • [Enhancement] Lookup table based test profiles for evaluating display color management.
  • [Enhancement] Profile information: Ability to plot CMYK profile tone response curves.
  • [Feature] Profile loader (Windows): Tray icon animation toggle.

Changed in this release:

  • [Enhancement] HDR SMPTE 2084 roll-off 3D LUT: Improved tone mapping.
  • [Enhancement] Slightly improved accuracy of XYZ LUT profile CIECAM02 gamut mapping.
  • Linux: Temporarily restored compatibility with wxPython 2.8.11/12 to support older distribution LTS releases that have not yet reached end-of-life. Note that this compatibility will not be maintained indefinitely, and will likely end by no later than April 2019. If you cannot update to a newer wxPython version on your current Linux distribution, consider upgrading your distribution to the latest release if possible.

Fixed in this release:

  • [Minor] Restored ability to create profiles from non RGB device measurement files.
  • [Minor] Profile information: Deal with potential NULL values in meta tags of 3rd party ICC profiles.
  • [Trivial] Profile information: Correctly parse non-default device media type attributes.
  • [Trivial] Profile information: Keep original tag order of 3rd party profiles when checking ID.
  • [Minor] Profile loader (Windows): Popup menu items stopped responding when used for a long time.

DisplayCAL 3.5.2 released

Fixed in this release:

  • [Trivial] Prevent potential “service/proto not found” error due to unreliable system APIs when attempting to automatically download updates or vendor files.
  • [Trivial] Linux: Restore missing icons in the window switcher and panel under XFCE.
  • [Trivial] Linux: Add missing i1 Studio entry to bundled instrument configuration files (ArgyllCMS >= 2.0).
  • [Trivial] Windows: Use bundled certificate authority (CA) certificates to circumvent potentially outdated system certificates under older versions of Windows.

DisplayCAL 3.5.1 released

This is a maintenance release.

Added in this release:

  • [Feature] Rudimentary support for WCS Color Device Model profiles (only description, author, white- & blackpoint, gamma, parametric curve, and matrix tags are recognized and mapped to appropriate ICCv2 types).

Changed in this release:

  • [UI] Updated traditional chinese localization (thanks to 楊添明).
  • [Enhancement] Update bundled vendor PNP ID database.
  • [Enhancement] Linux: Use SDL (Simple DirectMedia Layer) directly.

Fixed in this release:

  • [Minor] Work around Python issue #738361 (shell pattern compilation fails raising an unhandled exception if a path contains certain combinations of meta characters).
  • [Minor] Measurement report: Deal with quantization when creating the report (fixes error when using video output levels in combination with some display profiles).
  • [Minor] Profile loader (Windows): Display a proper error message when associating an invalid profile.
  • [Minor] Profile loader (Windows): In case of an invalid profile (e.g. damaged file), fall back to linear gamma ramps instead of using the previously cached ramps and change the tray icon to reflect this.
  • [Minor] Profile loader (Windows): Ignore potential stray WM_COMMAND messages caused by 3rd party application interference.
  • [Minor] Bump minimum required wxPython version to 3.0 (fixes a compatibility problem under Linux if wxPython 2.8 was installed).
  • [Cosmetic] Refresh output levels control when loading settings.