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* Curves: pencil mode, Smooth and Edit points (#3088) The Curves editor (Image > Adjustments dialog and the adjustment layer's Properties panel) gains Photoshop's "Edit points to modify the curve" and "Draw to modify the curve" buttons plus Smooth, with tooltips. A drawn curve is a 256-level map per channel, evaluated piecewise-linearly. - doc: Adjustment::Curves gains `pencil` (serde default), with curve_map / curve_map_outputs helpers. - compose: curve_map_lut / curve_lut_mode for drawn curves. - engine: curves params take `pencil` and `smooth`; channels accept 256-level maps; switching modes draws the spline into maps or fits up to 16 points to the drawing. Eyedroppers fit points first. - io: the PSD `curv` map flag (first byte, psd-tools `is_map`) was read as padding, so pencil curves from Photoshop were misparsed; they are now read and written as 256-byte maps, and smart-filter Curves use `Mpng`. - scorecard UI-217-15 note updated. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Properties: Curves adjustment layers get the black/gray/white eyedroppers (#3110) The Set Black/Neutral Gray/White Point pickers existed only in the Image > Adjustments > Curves dialog (#873). The Properties editor of a Curves adjustment layer now has them too (layer_picker.rs): with one armed, a click on the image runs one layer.setAdjustment with the new `eyedropper` param, which samples the image below the layer (the layer hidden, like its Properties histogram) at the Eyedropper's Sample Size, so a repeated click keeps the curve and the edit is one undoable, recordable step agents can send directly. Esc, another tool or another layer disarms it; ui.pointer and ui.inspect (`layerPicker`) cover it. Scorecard UI-217-15 is done. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Levels: black, gray and white point eyedroppers (#3116) Image > Adjustments > Levels and a Levels adjustment layer's Properties panel get Photoshop's Set Black/Neutral Gray/White Point eyedroppers. Black/white move each channel's input black/white to the sample, gray sets each channel's midtone gamma so the sample turns neutral at its luma (Grayscale: composite input, no gray). The engine takes the same `eyedropper` param as Curves on image.adjustments.levels, layer.newAdjustmentLayer.levels and layer.setAdjustment. On a smart object, image.adjustments.levels/curves with `eyedropper` now record the resolved adjustment as the smart filter instead of the raw sample, which re-rendered as an identity (#3127). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Merge upstream/main: Curves in new compose/gpu HDR tests gets the pencil field (#3088) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>