pixtreme 1.4.0

pixtreme 1.4.0 widens the colour vocabulary from 18 to 27 colorspace tokens and from 19 to 33 gamma tokens by adding
23 tokens across the Canon, Panasonic, DJI, Fujifilm, Nikon, Leica, Apple, and Samsung camera families and the
P3 / SMPTE-C / ACEScc / ACEScct / Gamma-2.5 standard set. Every new token is an independent addition: existing token
spellings, aliases, and float32 results are unchanged, and there are no breaking changes to the public API. The
published performance baseline (docs_site/performance.md and the README table) is regenerated from a single
same-run measurement of the current kernels on an NVIDIA RTX A6000 (WSL2, CUDA runtime 12.9, CuPy 14.1.1), replacing
figures that predated the 1.3.0 kernel fusions.

Added

• Added the independent Apple-Wide-Gamut colorspace and N-Log, L-Log, Apple-Log, and Samsung-Log
  transfers. N-Log uses the maximum-real-root branch intersection, L-Log uses the printed cut's tangent, Apple Log
  preserves its published lower collapse, and Samsung Log derives its lower offset at the upper-branch cut and
  extends that branch without the vendor codec collapse. These numeric identities intentionally have non-parity
  with printed cuts, ACES CTL, OpenColorIO-family evaluation, or codec clipping where those definitions differ.
  Apple Wide Gamut uses its published primaries and D65 with the shared Bradford production path; its CAT02
  ACES matrix remains an auxiliary check. Existing gamma and colorspace results remain float32 bit-identical.

• Added the independent D-Gamut and F-Gamut-C colorspaces and D-Log, F-Log, and F-Log2 transfers.
  The transfers apply the vendor-published linear and logarithmic branches directly to reflectance, using each
  branch intersection's maximum real root and separately rounded binary64 encode/decode cuts. Printed cuts, the
  rounded D-Log inverse, ACES CTL, OpenColorIO-Config-ACES, and vendor IDTs are explicit non-parity targets.
  D-Gamut and F-Gamut-C use their published primaries with D65 and the shared Bradford production path; vendor and
  CAT02 matrices remain auxiliary checks. Existing gamma and colorspace results remain float32 bit-identical.

• Added the independent P3-DCI, P3-D60, P3-D65, and SMPTE-C colorspaces and ACEScc, ACEScct, and
  Gamma-2.5 transfers. P3-D60 uses ACES white to align with the public ACES/OpenColorIO ecosystem; SMPTE EG 432-1's
  distinct nominal D60 is an auxiliary comparison and Resolve parity is not claimed. Gamma-2.5 is the conventional
  sign-preserving pure power because Resolve publishes no formula. ACEScc and ACEScct evaluate the Academy AP1
  analytic curves without an upper 65504 clip (a documented no-upper-clip extension); ACEScg supplies the standard
  AP1 colorimetry independently. ACEScc intentionally collapses nonpositive encode inputs, so ACEScct is the path for
  preserving negative components. Existing token results remain float32 bit-identical.

• Added the independent V-Gamut colorspace and V-Log gamma tokens. V-Gamut uses Panasonic's published CIE 1931
  xy primaries with D65 and the shared Bradford adaptation path. V-Log applies Panasonic's public logarithmic branch
  directly to reflectance and uses the cut-derived tangent for a C1-continuous lower branch, matching current
  OpenColorIO. Panasonic's printed linear branch, vendor IDT, and ACES CSC are not bit-parity targets. The external
  Panasonic V-Gamut / Panasonic V-Log labels, combined labels, and V-Log L remain outside the alias guarantee.
  Existing token results remain float32 bit-identical.

• Added the independent Canon-Cinema-Gamut colorspace and Canon-Log, Canon-Log-2, and Canon-Log-3 gamma
  tokens. The gamut uses Canon's published CIE 1931 xy primaries with D65 and the shared Bradford adaptation path.
  The transfers use the Canon 2018 full-range equations after mapping public reflectance with x = r / 0.9, extend
  their published signed branches without clipping or sign/magnitude mirroring, and retain values above 1.
  Canon Raw decoding and proprietary capture-gamut or OETF recovery remain outside the guarantee. Existing token
  results remain float32 bit-identical.

Changed

• DPX writes tag frames whose gamma is Canon-Log, Canon-Log-2, Canon-Log-3, V-Log, D-Log, F-Log,
  F-Log2, N-Log, L-Log, Apple-Log, Samsung-Log, ACEScc, or ACEScct with the logarithmic transfer
  characteristic in the file header, matching the existing camera-log tokens. Pixel encoding is unchanged.