sRGB IEC61966-2.1
Screen output context. It never replaces the master identity.
- Space / PCS
- RGB / XYZ
- Intent
- Relative colorimetric
- QC
- NOT_MEASURED
OPEN COLOUR IDENTITY WORKFLOW
Find colour.
Understand colour.
Keep its identity.
A browser-ready edition of ATLAS Clarus Connect. No installation, server, account or network connection is required.
PKL FULL REFERENCEIdentity first. Production feasibility later. Device values third. Measured QC last.
PICK A PIXEL
Image Picker
RGB-ONLY IDENTITY BINDING · MASTER
8283ab91…747c4Upload an image, choose a single pixel or a predefined square sample area, then click with the loupe. The observed 8-bit sRGB value is bound deterministically to the nearest ATLAS master reference. No Lab or ΔE is used for the primary assignment.
Your first palette · four steps
- Choose an image and click a pixel or a sample area.
- Open in Hover to inspect the reference. The Wheel is optional.
- Add to palette, then give your palette a name.
- Export Clarus JSON to keep a backup. Import it to restore the same references. Use ASE or GPL when taking swatches into a design app.
Continue to production: choose Prepare for print to carry the same references into two independent paths: 4C and ECG. Attach output profiles and export the handoff for local prepress.
Browser storage is local, not a backup. Clearing browser data or moving the HTML file may make saved palettes unavailable.
DISCOVER
Hover Library
MASTER
8283ab91…747c4UNDERSTAND
Colour Identity Wheel
A′ v0.4 LOGIC · FROZEN
The wheel locates the selected reference. v0.5 diagnostic fields are descriptive only and do not alter A′ selection or ranking.
Screen perception
White textDark text
Approximate sRGB review only; not medical certification.
Illumination resilience
Descriptive master evidence; no physical sample is measured.
Lock and compare
HARMONY
Geometric relationships
TONAL FAMILY
Same H and C across L*
MY PALETTES
Active palette · documented identities
Create and manage several local palettes from the palette button. Exports preserve frozen reference identity and master provenance, not production approval.
MULTI-PROFILE PRODUCTION VIEW
One identity, several output contexts
MEASURED SAMPLE VALIDATION
Append QC without overwriting identity
NOT_MEASURED
No measurement is bound. The selected identity remains the immutable target.
CONTINUE TO PRODUCTION
Prepare for print
PREPARATION · OUTPUT CALCULATION OPEN
One frozen reference set. Two independent production paths. Prepare 4C and ECG side by side, each with its own output profile and print settings.
PARALLEL PATH
4C · CMYK
Input: the frozen ATLAS references shown above.
- Reference CMYK values
- Not calculated
- Feasibility
- Not evaluated
- Measured QC
- NOT_MEASURED
PARALLEL PATH
ECG · 7 channels
Input: the same frozen ATLAS references shown above.
- Reference seven-channel values
- Not calculated
- Feasibility
- Not evaluated
- Measured QC
- NOT_MEASURED
CMYKOGV channel order and FOGRA55 applicability must be confirmed from the supplied profile and printing condition.
PKL-FIRST PARALLEL IMAGE COMPARISON
One source. One PKL reference. Two production previews.
Load a browser-sRGB source. Every pixel is first bound to an exact RGB value from the active PKL master. Both ICC previews then use that same PKL Full Reference.
PNG, JPEG or WebP · local processing · preview up to 1200 px on its longest side.
PKL Full Reference ↔ 4C preview
Load an image to begin.
PKL Full Reference ↔ ECG preview
Load an image to begin.
Controlled chain: browser sRGB source → PKL Full Reference → selected 4C or ECG output profile → sRGB preview. PKL assignment uses RGB squared distance only, with atlas_row_id as the deterministic tie-break; Lab and ΔE do not define identity. Return to sRGB is relative colorimetric, with no paper-white simulation. These are screen previews, not measured print results.
Both paths start from the same ATLAS references. Neither path receives the other path’s device values. Profile changes preserve the source identity.
Keep the handoff as a JSON file; this preparation is held in memory only. Attached ICC files (up to 16 MiB each) are embedded in the JSON. Reference device values, PDF/X output and physical measurement remain separate steps. The readable report is a preparation record, not a colour proof.
EXPLORE
Appearance Pixel Simulator
SIMULATION · NOT MEASURED QC
A local visual exploration layer. Material, finish, illumination and angle change the simulation — never the frozen reference identity.
CONNECT
How ATLAS Clarus connects to design applications
DOCUMENTATION · DESKTOP APPS NOT INCLUDED
Choose an application to see what ATLAS Clarus can already hand over, what has been verified, and what still needs practical testing. This page explains the connection; it does not run the desktop application inside the browser.
EVIDENCE
About this bundle
READY_PENDING_VISUAL_AUDIT
Identity baseline
13,283 master references. Zero-based atlas_row_id. Deterministic RGB-only reference binding. Workflow v3.4.0.
Local by design
This edition runs from index.html. It sends no analytics, user actions or colour selections anywhere.
Claim boundary
A displayed or simulated colour is not a physical measurement, production approval, print proof or certification.
Help & evidence
Offline guide and FAQ
Licensing and attribution
Validation baseline
These internal links work without extracting additional files.
HELP
Frequently asked questions
IDENTITY FIRST
What is ATLAS Clarus?
An open workflow for finding, understanding, collecting and handing over colour-reference identities without silently redefining their source.
How do I build a palette?
Choose a colour in Hover and select Add to palette. You can create, name, duplicate, sort, import and delete several local palettes. The active palette is shared by Hover and Wheel.
Which exports are included?
ASE for Adobe/Affinity, GPL for GIMP/Inkscape, Figma-compatible Tokens JSON, CSS custom properties and Clarus JSON with identity evidence.
Does an export preserve the identity?
Clarus JSON retains the full reference metadata. Other application formats carry usable names and exact master RGB, but their host applications may not retain every provenance field.
Is the displayed colour physically exact?
No. Screen colour depends on display, profile and viewing conditions. It is a reference representation, not a measured print, textile, coating or production approval.
Does the bundle track users?
No. It runs locally, sends no analytics or colour selections, and stores the shared palette only in this browser's local storage.
What does frozen A′ v0.4 mean?
The established selection and ranking logic is not changed by this browser edition. Interaction Wheel v0.5 adds descriptive diagnostics only.
Is this a Pantone library?
No. Observed source-context views are descriptive and claim no Pantone identity or equivalence. ATLAS references remain independently addressed.
ACKNOWLEDGEMENT
Credits & licensing
OPEN COLOUR WORKFLOW
ATLAS Clarus Connect builds on open colour-reference work and keeps upstream attribution, ATLAS modifications and third-party boundaries visible.
Reference data
HLC-derived database material is used with acknowledgement to freieFarbe e.V. and freieFarbe.de.
Copyright (c) freieFarbe e.V.
ATLAS Clarus work
The reference files were converted, indexed, reorganised or enriched for ATLAS Clarus. They are modified data products, not unchanged original freieFarbe distributions.
Copyright © 2026 ATLAS Clarus contributors.
Licence map
Original software: GPL-2.0-or-later.
Original documentation: CC BY 4.0.
HLC-derived reference data: zlib licence, with upstream notices.
The complete attribution and licence summary is included here so it remains available when index.html is opened directly.
Independent project
ATLAS Clarus Connect is not affiliated with, endorsed by or certified by Pantone. No Pantone library, identity or equivalence is licensed or asserted.
Other product and company names remain the property of their respective owners.
Source
Source code, modification history and validation records are published at HelabHLC/atlas-clarus-connect.
Colour boundary
Reference identity is not physical colour certification. Screen simulations, exports and application values do not constitute a measured production result.
COLOUR · SOURCE · HISTORY
Colour handoff
Take your colour decisions with you. Keep the original values, their Atlas addresses and their recorded origin together.
1. Choose your starting colours
Choose up to 250 colours. The complete source palette stays attached. References are a deliberate new starting point; an unrecorded original remains unknown.
Drop one decision JSON here. Existing decision IDs and history are preserved.
One working set is kept in this browser. Save its full JSON before replacing it with a different set. Source-palette edits do not change an existing working set.
2. Save or hand over
No colour decisions loaded.
The ZIP contains RGB swatches, full provenance JSON and a checksum manifest. Keep these files together. The same JSON opens in Colour Kit 0.3.0.
Colour reference cards: download printable HTML, full decision JSON and checksums. Each decision stays separate, even when Atlas addresses match. Open the HTML and use Print / Save PDF.
What travels with the colour?
The recorded image name, pixel or area location, available image hash, original RGB, Atlas assignment and later decision revisions stay in the JSON. ASE swatch names link to those records. Hashes check consistency; they do not authenticate authorship.
A native Adobe round trip remains untested. The provenance JSON is a companion file and is not automatically embedded in an Adobe document.
3. Check a returned palette
Keep each swatch’s AC_ identifier prefix. Return exactly the exported RGB swatches. Changes become linked revisions of the same colour decisions.
Checking the reference data …
Open Image Projects · edit images with history
YOUR COLOURS · YOUR DECISIONS
Colour Projects
Your colours. Your decisions. A project you can take with you and keep developing.
Collect colour sets, record changes and choose the design versions you want to use. Everything runs in this browser. Download the project JSON as your portable backup.
1. Open your project
Or drop project.clarus.json here. Extract handover ZIPs first.
No project open.
2. Bring your colours
Use Colour handoff to prepare recorded originals from your active palette. Its decision IDs and complete source document travel into the project.
3. Save and share
Project JSON reopens the complete project. The ZIP adds a readable passport and separate working / chosen swatches with their provenance JSON. Colour Kit opens the palette JSON inside each set.
Keep source images separately. A chosen version records a design decision; it is not measured production approval or proof of authorship.
Checking the project workspace …
Edits keep the original decision and its history. Changing a working colour does not change an already chosen version.
Project history
YOUR IMAGE · EVERY RECORDED CHANGE
Image Projects
Recolour a selected colour or area. Make an area transparent. Undo without losing the story.
The original file and frozen starting pixels stay inside your image-project JSON. The handover ZIP adds the original file and current PNG. Work stays in this tab until you download it.
1. Start or reopen
Up to 4,194,304 pixels and an 8 MiB source file. Larger images are rejected without resizing. Palette changes and image edits remain separate.
Or drop an Image Projects JSON or exported ZIP here.
2. Save and hand over
Your colleague opens the ZIP or image-project JSON in Image Projects. Their browser must reproduce the stored starting pixels exactly. PNG alone does not preserve the full history. A linked palette snapshot can also be opened separately in Colour Projects.
If a colleague cannot open your project
Keep and send the complete, unchanged JSON or ZIP. Colour profiles and transparency can decode differently between browsers, so a valid project may be rejected. Try a browser setup that verifies the file exactly; the browser name alone is not a guarantee.
Do not replace the frozen pixels, remove the colour profile or start again from the current PNG to bypass the check: that would lose the original relationship and editable history. If no compatible setup is available, retain the files and ask the sender to continue in their verified environment.
Physical iPhone and iPad tests are still open.
Open an image to start. This workspace is not automatically saved in browser storage.
Edits use browser-decoded 8-bit sRGB. Recolouring applies a flat RGB value and preserves existing opacity; making pixels transparent keeps their earlier RGB values in the project history.
Checking the reference data …
Working image
Click to sample a colour. Drag to select a rectangle. You can also enter exact coordinates below.
No colour sampled.
Original preview & file identity
3. Record your edit
Exact matching uses the same RGB numbers, with no tolerance. Similar shades are not automatically included.
Undo and redo add history entries. Earlier edits and removed colours remain recoverable. A new edit after undo keeps the abandoned steps in the journal.
Recorded image history
Every step identifies the affected pixels, input/output checksums and your note. Hashes check consistency; they do not authenticate authorship.
T-SHIRTS · TEXTILES · LIMITED-COLOUR MOTIFS
Colour Reduction
Choose a smaller motif palette. Protect important Atlas colours. Compare before you hand over.
Original RGB → full Atlas assignment → selected output palette. Each stage stays separate. Reducing to four motif colours does not automatically produce four print-ready screens.
1. Choose your source
Save the complete job ZIP to resume later with palette, protections, corrections, cleanup and variants. Older evidence ZIPs cannot restore a job. Opening verifies all files and replays the result before replacing the current job.
Up to 4,194,304 pixels; source image up to 8 MiB. An Image Project is verified and its current image is used, with the complete project retained. No resizing.
No source loaded.
2. Set the motif palette
Click a visible pixel in the input preview or enter HEX. Protection keeps the assigned reference from the active library (full master in original mode) in the selected palette; its RGB may differ from your original. Protected colours count towards the limit.
Protect selected source colours
Uses the HEX above. Here, “original” means the frozen, browser-decoded sRGB input, not the channels stored in the image file. Keeps every matching visible pixel in the frozen, browser-decoded input exactly, including alpha. Each original reserves one palette slot separately from protected references. No tolerance, no area mask. Other colours can still become the same output RGB.
Protect colours in a rectangle
Select the first pixel in the input image or refine it with the 11 × 11 loupe. Set the first corner, select the opposite pixel, then protect the rectangle. Both edge pixels are included. Green outlines are preview annotations only.
Select a pixel, then set the first corner.
All frozen, browser-decoded RGB nuances and alpha inside each rectangle stay exact. Their distinct visible RGB values reserve palette slots. If protection exceeds the limit, the preview stops and asks you to increase it or reduce the protected area. Outside colours can still become the same output RGB.
Checking reference data …
Input image
Move over the image to magnify original pixels. Click or tap to keep a selection, then refine it in the pixel magnifier below. Arrow keys move one pixel; Shift + arrow moves ten.
Pixel magnifier · 11 × 11 original pixels
The loupe shows frozen, browser-decoded sRGB RGB/RGBA8 values. In original mode, original RGB and rectangle protection preserve these values exactly. In library mode, selected colours are converted to library references and then fixed. Browser decoding may change stored file channels, especially with partial transparency; it does not guarantee identical numbers to the PNG file. The outlined centre is selected. Click a magnified pixel or use the arrows to refine your selection.
Reduced preview
Create a preview to compare.
Compare variants
Drag any comparison panel to move all three views together. These views do not change pixels or export settings.
Original input
Reduced · before cleanup
Current output / saved variant
Hover or tap a comparison image to inspect one source pixel. Arrow keys move the selected pixel.
Markers, magnifiers and overlays are inspection aids only; exported image pixels are unchanged. Saved variants show their own reduction, cleanup and protection settings.
Correct and protect an area
Use after the first reduction. Hover or tap a pixel in the current comparison and set each corner below, or enter source-pixel coordinates. Suggestions always come from the original source, never the distorted output. Save a variant first if you want to compare the previous palette.
Create a reduced preview first.
Both rectangle edges are included. Corrected visible pixels are fixed during cleanup under either scope; alpha stays unchanged. Recalculation can change unlocked colours elsewhere. Corrections must not overlap. Changing the library or mode, or loading another source, clears corrections. Original pixels and full-master assignments stay separate.
Clean up unprotected areas
Palette locks always retain their references during reduction. For cleanup, choose whether their pixels everywhere are protected too, or only pixels explicitly selected through source-colour locks and rectangles. Exact original RGB entries always remain protected.
Simplifies small connected colour islands using existing palette colours. Selected pixel areas stay unchanged. The scope control determines whether protected palette colours are also protected everywhere. Alpha is preserved. Each application starts from the reduced preview, so cleanup does not accumulate.
Selected output palette
Export up to 256 selected output entries. In original mode, exact originals are labelled separately from Atlas reference swatches. Clarus JSON chunks contain references only; use the full ZIP for original RGB evidence.
The ZIP retains the original image file byte-for-byte, separately from frozen, browser-decoded input pixels, Atlas assignments, reduced PNG and palette. In reduction.json, file_sha256 identifies the original file; input_rgba_sha256 identifies the frozen pixels. The manifest checksums cover the exported files. Keep it for handover. It is a reduction evidence package, not an editable Image Projects ZIP.
For T-shirt printing: what this preparation means
For flat-colour motifs, a small palette can help you and the printer discuss the design. This RGB-only pilot creates no separations, screens, halftones, underbase, trapping or ink recipes. The printer determines those production steps.
Transparency and partial opacity are preserved. Semi-transparent edges can produce additional apparent colours on fabric; no garment background is baked in. Dithering is off. The number shown counts visible RGB motif colours, not inks or screens.
For photographic DTF, DTG or sublimation work, use the full-colour original unless you deliberately want a reduced look or the printer requests it. The preview is not a fabric proof or production approval.
Open separate Mixing Atlas stored-recipe importer · Stored computational results only; no physical validation.
ATLAS CLARUS
Exchange between tools
Keep complete source files, original RGB, fixed references and history together. Prepare an explicit working view for another tool and bring its edits back into the same package.
A working view can contain fewer editable fields than its source. The complete source stays in the exchange ZIP. PNG, ASE, GPL, CSS, tokens and recipes can be retained unchanged as attachments; that does not make them complete editable projects.
Starting …
Use Save complete exchange ZIP for the complete transfer. A native file downloaded separately contains only that document. No silent truncation, no silent rebinding; unsupported conversions fail explicitly. Checksums verify consistency, not authorship. Offline preview; no automatic sync.