2.1.1

[2.1.1] - 2026-07-26

Added

• Exact multi-amplifier ROI geometry and measured row-major gain/offset response
  fields. The OCAM2K preset now declares its eight-output 4x2 layout; cropped
  configurations can preserve their true split pixels.
• Optional CuPy detector execution via Camera(..., device="gpu"). Photon-rate,
  electron, FrameTruth, and digitised ADU arrays remain device-resident through
  scalar and spectral exposure paths, including all detector artifact models and
  both binning modes. Frame.device, get_backend, get_array_module, and
  to_numpy make the execution and host-copy boundaries explicit.
• CUDA parity tests cover seeded reproducibility, CPU/GPU statistics, spectral
  truth, CCD/CMOS/sCMOS/EMCCD/eAPD paths, fixed structure, gain, and detector
  artifacts. The benchmark runner accepts --device gpu|both.
• Added a reproducible paired-device bulk-throughput suite, self-describing JSON
  artifact, rendered reference table, and README/GPU-guide CPU-versus-GPU results
  for representative WFS, EMCCD, eAPD, and large science-frame workflows.

Changed

• Re-characterized the OCAM2K preset from the Keck unit report and supplied
  detector studies: approximately 28 output e-/ADU (21.43 ADU per input electron
  at EM gain 600), 0.360 e- input-referred read noise, 1.579 e-/pixel/s dark
  current, and a separately derived 0.004912 e-/pixel/frame CIC term. The output
  saturation charge and representative Keck bias now use the same conversion
  convention.
• Fixed PRNU/DSNU/hot-pixel, amplifier, bias-structure, and defect maps are built
  once on persistent Camera construction rather than regenerated for every
  frame. This preserves the fixed-pattern contract and materially improves both
  CPU and GPU warm exposure throughput.
• Optimized warm detector execution with in-place signal construction and
  digitization, direct full-array Gamma sampling, working-precision CPU/GPU
  Gaussian and Gamma draws, and a reusable per-call GPU seed stream. The RTX
  5090 reference improves GPU CMOS throughput by 1.36x–1.42x and GPU EMCCD/eAPD
  throughput by 2.35x–2.41x over the initial implementation without changing the
  detector distributions.

Fixed

• Separated image-area and post-multiplication saturation with the optional,
  backwards-compatible CameraConfig.output_full_well_e. Gain-stage input charge
  now clips at full_well_e before multiplication. The OCAM2K preset uses Andor's
  published 270,000 e- image well and Keck's measured 10,000-count output ceiling,
  instead of incorrectly clipping multiplied signal at 250 e- (25 ADU).