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Holding Alt (Option on macOS) while dragging an Edit slider shows Lightroom's temporary previews: highlight clipping for Exposure, Highlights and Whites, shadow clipping for Shadows and Blacks, greyscale for Sharpening Amount, the detail band for Radius / Detail and the sharpening mask for Masking. They are render overlays (pipeline visualize), drawn the same way after the CPU and GPU renderers; the sharpening views read each renderer's own detail planes. Settings and normal output are unchanged. Fixes #937 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>