mirror of
https://github.com/storytold/photocraft.git
synced 2026-10-28 20:07:05 -06:00
UnemarsandClaude Opus 5.5
f08cffd4d1
* Color Range: Photoshop's Sampled Colors model and the eyedropper on the canvas Sampled Colors now compares colours in Lab (through the document's profile) the way Photoshop does, reconstructed from Photoshop 2024's own masks (observation only): per-axis distance outside the samples' Lab box in 8-bit units, a/b weighted x3, the largest of the three, and a quadratic B-spline falloff of width fuzziness*256/255. On 8-bit sRGB images it matches Photoshop to under one level of 255 on average (the previous per-channel RGB distance was off by about 12). Several samples span one Lab box, like Photoshop's Minimum/Maximum. While Color Range is open, the pointer over the free canvas is its eyedropper: a click picks that pixel, Shift adds to the sample, Alt subtracts (also through ui.pointer on the control channel). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> * Color Range: Photoshop's Subtract from Sample, click order, 8-bit Lab grid Measured through Photoshop's real Color Range dialog (eyedropper clicks): - Subtract from Sample reshapes the samples' Lab box per axis: inside it the nearer edge moves onto the subtracted value; on an edge or within the axis width w it moves in to the first of m + k*w/5 beyond it (k <= 5); further out nothing changes; an edge never crosses the other. Matches every measured box to +-0.05. The click order matters, so select.colorRange takes an optional `order` list and the dialog records it. - The a/b centring shift of the previous change was an artefact of scripted samples (Photoshop's descriptor Lab scale); with the eyedropper the sampled colour is fully selected at any fuzziness. Removed. - 8-bit documents compare pixels and samples on the 8-bit Lab grid, where an a/b step above the samples' range counts half a unit more and one below half a unit less (lab_range_coverage_8bit). On Photoshop's eyedropper masks of a photo the mean error is ~0.46 levels of 255 at fuzziness 40/80 and ~0.02 at 5/10 (previous change ~0.9). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>