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Perceptual-metrics Phase 2. The picker now shows a second readout row under the WCAG ratio: the OKLCH coordinates (L, C, hue°) and the signed APCA Lc against the ground color. WCAG and all three contrast tables are untouched, so APCA stays picker-only for v1.
APCA Lc carries its sign convention in a tooltip and in the README: positive is dark text on a light background, negative is light text on a dark background, so a light color on dupre's dark ground reads negative.
pkReadout drives the new spans from the inlined colormath functions, and a #readouttest headless guard loads dupre-blue and asserts the spans match both the live computation and the known OKLCH reference, with WCAG unchanged.
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Perceptual-metrics Phase 1. generate.py inlines the colormath.js body into the page script, stripping the ES-module export so one source feeds both the browser and the Node tests. The page's own lin, rl, contrast, rating, hsv2rgb, rgb2hsv, hex2rgb, and rgb2hex copies move into colormath.js. normHex, textOn, and ratingColor stay in the page as UI-boundary helpers.
rl now reuses colormath's canonical lin (0.04045 cutoff) instead of the old 0.03928 form. The two are byte-identical on every #rrggbb: no 8-bit channel falls between the cutoffs (10/255 = 0.0392, 11/255 = 0.0431), confirmed over 200k random pairs with zero contrast change and no AA/AAA flips.
test-colormath.mjs adds Normal/Boundary/Error cases for the migrated helpers, a seeded hsv-rgb round-trip property test, and an inline-integrity check that the generated page carries the colormath.js body verbatim, so the inlined copy and the tested module can't drift.
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colormath.js is the pure color-math module both theme-studio features need: OKLab/OKLCH conversions, oklch2hex with a binary-search gamut clamp, APCA (APCA-W3 0.1.9), and deltaE-OK. It's tested directly in Node (test-colormath.mjs under node --test) against the spec's fixtures (OKLab anchors, the red and dupre-blue OKLCH values, APCA at 106.0 and -107.9, the clamp invariants), at 100% line and 90% branch coverage. Next: generate.py inlines it and the existing rl/contrast/hsv helpers move in.
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theme-coloring-guide.org is the design philosophy behind the tool, organized from principles out: seven laws, a role-to-treatment seed table, and three tiers (syntax, UI faces, org packages) as that table projected onto Emacs faces. It documents a shade budget per hue family, a functional signal-color convention table (not an emotion table), color-vision rules, and Emacs face specifics, and closes with canonical references. The README points to it, and dupre is the worked example.
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openPicker positioned the crosshair while the picker was still display:none, so its client dimensions read 0 and the crosshair pinned to the top-left corner instead of the shown color. I moved display:block ahead of paintPicker so the element has layout when its size is read, then added a headless #cursortest that opens the picker on a saturated color and checks the crosshair lands off-corner.
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Saved theme-studio exports for the dupre palette. dupre.json holds the base palette, UI, and syntax assignments; dupre-revised.json adds the full per-package face set across 51 packages. build-theme.el converts either into a loadable deftheme.
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Clicking a UI or package face already called the flash, but two things hid it: the flashtok animation was scoped to #codepre and .ex cells, so the class landed on the mock-frame and package-preview spans without ever animating; and the flash never scrolled its target into view, so an element below the fold of a preview's scroll box flashed unseen. The animation is now global, and the flash scrolls its element into view (the first of several, via a new flashEls helper). Clicking a face in either tier now lands the viewport on the matching preview element and lights it up.
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The tool authors themes from scratch -- palette, faces across every tier, live preview, export to a loadable deftheme. It never selects among existing themes, so "selector" mis-described it. Renamed the directory, the generated HTML and its title, the design spec, and every reference in the code, README, tests, and todo. No behavior change.
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