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Color workflow for RNVizion: mix colors (digital and physical/paint models), convert formats, generate harmonies, transform text case, and remember named palettes. Color inputs accept hex, CSS names, RNV brand names (brand gold, near-black), or saved-palette references.
Perceptual difference (Delta-E) between two colors. color1 and color2 accept a hex, CSS name, RNV brand name, or saved-palette reference. method is 'ciede2000' (default, modern standard) or 'cie76'. A value near 1.0 is the threshold the eye can just notice; larger means more different. Returns the value and a plain-language interpretation. Read-only and deterministic, with no side effects. Use ciede2000 for accuracy and pick cie76 only to match a legacy system; to test whether text is legible on a background (not raw difference) use contrast_check instead.
WCAG contrast ratio between a foreground and background color, for accessibility. Both accept a hex, CSS name, RNV brand name, or saved-palette reference. Returns the ratio and pass/fail for each accessibility level (AA/AAA, normal/large text). Read-only and deterministic. Use when you need to check whether text will be legible on a background; for raw perceptual difference use color_difference instead.
Convert a color between formats. Input accepts a hex, CSS name, RNV brand name, or saved-palette reference. With `to` set to one of hex/rgb/hsv/hsl/lab, returns just that format; otherwise returns all of them. Read-only and deterministic, with no side effects. Use for format conversion of a single color; to blend several colors into one use mix_colors, and to compare two colors use color_difference.
Generate a color harmony from a base color. base accepts a hex, CSS name, RNV brand name, or saved-palette reference (e.g. 'Spring line:2'). scheme is one of: complementary, analogous, triadic, split-complementary, tetradic (a.k.a. square), monochromatic, compound. Returns a list of hex colors. Read-only and deterministic: it derives the colors from the base and stores nothing, so it has no side effects and is safe to call repeatedly. Use to expand one base color into a related set; to blend existing colors into a single color use mix_colors, and to persist a set you like use save_palette.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | F | 11 | 2025-06-18+ | v2 |
Retrieve a saved palette by name. Returns the colors and notes. Read-only. Use to load a palette for further editing or reference.
List all saved palettes by name. Read-only. Use to discover what palettes have been saved.
Blend up to 12 colors into one. Each color may be a hex (#d2bc93), a CSS name (red), an RNV brand name (brand gold, near-black), or a saved-palette reference (Spring line, or 'Spring line:2' for its 2nd swatch). Optional integer weights bias the blend (defaults to equal). mode selects the model: rgb/hsv/lab are digital blends (lab is perceptual and the default, best for on-screen color); paint mixes pigments via Kubelka-Munk physics (colors darken like real paint, use it for physical-media matching); ryb is the artist's color wheel; cmy is subtractive like printer inks. Returns hex and rgb. Reach for paint when BLENDING brand colors into a new one, and lab when SAMPLING between them: lab averages chroma toward the centroid of its ingredients, which is right for finding a midpoint and wrong for making a new color. RNV's #00b0a0 was blended in paint; the same ingredients at the same weights in lab give #9cc1a5, 15.94 away and far closer to the brand gold it exists to be distinguishable from. Read-only and deterministic: it computes a result and stores nothing, so it is safe to call repeatedly with no side effects. Use to combine multiple colors into a single blend; to convert one color between formats use convert_color, and to measure how far apart two colors are use color_difference.
Hold a color's hue and chroma and set its lightness, returning one result per requested L*. color accepts a hex, CSS name, RNV brand name, or saved-palette reference; lightness is a list of L* values in 0-100. This is the operation behind a LIGHT/DARK PAIR: one hue at two lightnesses, with a and b held exactly, which is how a color that works on a dark ground gets a partner that works on a light one. Use it when you need the same color at a different lightness; use mix_colors when you need a different color. Returns the source color's LAB, and for each placement the hex, the achieved LAB, and the quantization error per axis -- 8-bit hex cannot store a and b to the precision LAB expresses, so two placements of one hue differ by a few hundredths on both axes however exactly the input held them. That is the storage format, not the operation, and it is reported rather than hidden. Read-only and deterministic. Refuses rather than clamps: not every (L*, a, b) exists in sRGB, and a lightness too far from a chromatic color's range is rejected with the reason instead of being silently moved to the nearest color that fits.
Save a palette (name + colors + optional notes) for later recall. Persists to HuggingFace Dataset if HF_TOKEN is set. Returns the saved palette. Use when you want to remember a color set for later use.
Transform text case: snake_case, PascalCase, camelCase, CONSTANT_CASE, kebab-case, UPPER, lower, Title Case, or Sentence case. Read-only and deterministic, with no side effects. Use to reformat identifiers and labels.