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• Create Date May 28, 2026
• Last Updated May 28, 2026

AltaLux 2.0.0 (x64) plugin for IrfanView

Added

• Fixed three-layer multiscale CLAHE processing.
• Strength, Detail, and Natural look controls.
• Large before/after split preview.
• Spacebar hold-to-compare.
• Double-click split recenter.
• Fit and 1:1 preview modes.
• Natural, Balanced, and Detail presets.
• Shared AltaLuxCore module.
• Unit tests for the v2 behavior.

Changed

• Replaced the old Intensity/Scale dialog workflow.
• Replaced the preview-variation grid with a direct comparison preview.
• Changed the non-dialog parameter model so param1 controls Strength.
• Updated version resources to 2.0.0.0.
• Updated project files to include AltaLuxCore and newer MSVC toolsets.

Fixed and improved

• BGR/BGRA-aware luminance routing for Windows DIB data.
• BT.709 luminance coefficients.
• Highlight hue drift reduction through scale capping.
• RGB32 alpha preservation.
• RGB24/RGB32 consistency for matching RGB content.
• Zero-strength no-op behavior.
• Packed YUV luma paths using SSE intrinsics instead of old inline assembly.

Performance

• SIMD multiscale accumulation and final blending.
• Thresholded parallel accumulation/blending.
• Parallel execution of the three CLAHE layers for large images.
• Smaller reciprocal lookup table for color scaling.