PKL Image & Multi-Illuminant Analysis Workbench

ATLAS Clarus — PKL Image & Multi-Illuminant Analysis Workbench

Deterministic PKL Binding · Connected Regions · Spectral Comparison · Multi-Illuminant Analysis · Documented Decisions

WP v0.9.1 QC = NOT_MEASURED

Step 1 of 5

1. Load the example

Sample image: green on the left, blue and brown on the right

Original reference

Shown alternative

Light	Distance from original (ΔE00)

Smaller values mean a closer match under that light. These reference calculations are not a measurement of a dyed fabric or a production approval.

Example: a large green region beside blue and warm brown regions

New here? Try a guided example.

A five-step tour: the tool loads the example, selects a region and shows the lighting comparison for you. Just follow Next. The sample is synthetic sRGB, not a measured material.

One click starts an automatic, step-by-step tour.

Quick Guide — Simple Steps

1Choose an image.

2Confirm sRGB and click Bind image → PKL.

3Click directly on a colour in the image.

4The frozen PKL source colour appears on the right.

5The clicked connected region is selected separately from all other occurrences of that PKL colour.

6Sort candidates and save interesting ones with → A / → B / → C.

7Choose a decision for the region, then export the decision JSON and binary region mask.

A small ΔE00 under D50 means a close match under D50. A small difference between the D50 and D65 colour distances means a more consistent match across these two lights. These are analysis results, not production approval.

Loading ATLAS web data…

1. Choose image I confirm: source pixels are documented 8-bit sRGB.

The image is processed locally in this browser only. The frozen source_atlas_row_id is not overwritten by alternatives or metamerism analysis.

IMAGE / PICKER

After binding, click directly in the image.

Magnifier

Original PKL reference

Select a region to see its reference.

Selected alternative

Select a candidate or use the guided tour.

Choose an image, confirm sRGB, then bind deterministically.

Picker: waiting for PKL binding.

LARGE PREVIEW Uses the current view and fills the available work area below the picker.

Current view: Original

FROZEN PKL SOURCE

This is the unchanged source reference.

No source selected

atlas_row_id = —

RGB = —

HEX = —

HLC = —

Image share = —

PKL swatch integrity NOT_RUN

CONNECTED REGION Exact PKL identity, spatially connected from the clicked pixel.

Connectivity

No region selected.

region_id—

pixels—

image share—

bounding box—

PIXEL MAGNIFIER waiting for binding

Move the mouse over the bound image or click.

ILLUMINANTS Start with D50, D65, FL11 and LED-B3. Add more reference lights below.

CIE Illuminant A CIE fluorescent data

Anchor illuminant Selected alternate Candidate corridor ΔE00 ≤

More illuminants

38 reference illuminants available · loading starter lights…

Additional CIE reference

All loaded lights are included in the comparison. CIE reference spectra cover 380–780 nm; ATLAS calculations use 380–730 nm and the CIE 1931 2° observer.

Source: CIE 2018, CIE 015:2018, fluorescent reference data and LED reference data. Data licence: CC BY-SA 4.0. The published 1 nm tables are interpolated reference data, not measurements of your lamp.

Add SPD CSV

D50 D65

Custom SPD files are integrated with the supplied CIE 1931 2° observer. ATLAS reflectance remains limited to 380–730 nm; no reflectance is extrapolated outside that range. Uploaded SPDs must cover 380–730 nm. This is EXPERIMENTAL / SHADOW analysis.

Search goal / sorting

ALTERNATIVES A / B / C

Save three candidates at the same time and compare them in the image.

ALTERNATIVE A

No alternative assigned yet.

ALTERNATIVE B

No alternative assigned yet.

ALTERNATIVE C

No alternative assigned yet.

DECISION

Record the choice for the selected connected region. This never overwrites the frozen source identity.

DETERMINISTIC RECOMMENDATION Rule: candidates must pass the current anchor ΔE00 corridor. Then choose smallest multi-illuminant spread → smallest anchor ΔE00 → smaller atlas_row_id. The recommendation is not a production approval and is not committed until you confirm it.

No recommendation generated.

Reason Note

No decision recorded for this region.

REGION DECISIONS

Confirmed region decisions are stored in the current browser session. R001, R002… are session labels; the canonical region_id remains the reproducible region identity.

Region	source row	recommendation	decision	candidate row	pixels	reason	action
No confirmed region decisions yet.

“Changed regions” highlights only confirmed USE ALTERNATIVE regions. “Decision map” labels all confirmed regions, including KEEP SOURCE. Highlight overlays are UI annotations — not PKL/PHL reference colours.

MULTI-ILLUMINANT METAMERISM CANDIDATES

CIE 1931 2°; D50/D65/FL11/LED-B3 loaded initially; further reference or uploaded SPDs may be added. EXPERIMENTAL / SHADOW.

No source selected.

row_id	reference	ΔE00 anchor	ΔE00 alternate	max ΔE00	multi spread	worst illuminant	spectral RMSE	save
Please click a PKL source in the image first.

SPECTRAL COMPARISON

Currently inspected alternative versus the frozen source.

SOURCE CANDIDATE

MULTI-ILLUMINANT COMPARISON

Digital reference calculation; not a physical measurement.

Anchor—

Selected alternate—

Max ΔE00 across loaded illuminants—

Multi-illuminant spread—

Worst illuminant—

Spectral RMSE—

No candidate selected.

Method / limitations

Reference Identity: Workflow v3.4.0 RGB-only. Integer squared RGB distance; exact tie → smaller atlas_row_id; K = UNLIMITED; Seed 42 documented/not used.

Alternatives: A/B/C are separate candidate/simulation layers. The source_atlas_row_id remains unchanged.

Metamerism: EXPERIMENTAL / SHADOW. Anchor and alternate illuminants are analysis choices made only after source identity freeze. Multi-illuminant rankings are not normative risk classes.

Spectral: ATLAS reference reflectance is limited to 380–730 nm. Built-in D50/D65 and uploaded SPDs are evaluated with the supplied CIE 1931 2° observer over that documented interval. Uploaded SPD provenance remains the user's responsibility.

PKL display: PKL mapped and A/B/C previews use the exact 8-bit RGB values of the active master rows. Pixel self-tests check row/RGB/HEX.

Production: DEVICE = NOT_PROVIDED. measured_qc_status = NOT_MEASURED. No production approval.