Guidism — Ishihara Plate Generator

Symbol (0‑9 / A‑Z) Up to 4 chars

Plate size (px) Canvas edge

Dot count Higher ⇒ finer

Dot size (px) Mean radius

Small dot % Large/medium inferred

Large dot % Medium = 100 − small − large

Jitter L (0–1) Luminance variance

Jitter A (0–1) Chroma axis 1

Jitter B (0–1) Chroma axis 2

Jitter angle (deg) Elliptical tilt

Min spacing factor Min dist ÷ radius

Overlap % Allow rare closer dots

Deficiency type Target to hide

Severity 0.80

Plate type Diagnostic style

Min ΔE₀₀ (normal) Ensure normal viewers see it

Max ΔE₀₀ (target) Make it vanish for target

Max ΔL (normal) Keep luminance similar

Max ΔY (luminance) Prevent brightness edges

Min chroma (normal) Avoid dull colours

Tri-palette background Two similar BG inks

BG1 share % BG2 share = 100 − BG1

Edge band width factor Boundary thickness

Edge mixing % Blend foreground/background

Difficulty Presets tighten constraints

Force seed (debug) Lock RNG for comparisons

…

Tip: Re‑roll colors if no valid pair is found under current thresholds.

Ready.

Craft experimental screening plates and export high-resolution canvases for further study.