Turn a theme, sentence, object, or supplied photograph into an original editorial image. The skill defaults to controlled two-ink with one dominant plate and one narrowly assigned accent plate. Explicit one-ink or monochrome requests remain pure one-ink. White, cool gray, or pale-beige substrates are selected from the image and palette; contemporary editorial is the default, while vintage treatment appears only when requested.

It preserves a visual system rather than copying a reference. Every composition is rebuilt around the subject, intent, words, and image role.

Visual references

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This reference set defines the visual territory, not compositions to reproduce. Each new result rebuilds the subject, crop, grid, type hierarchy, and print treatment from scratch.

What it does

Use cases

• Posters: events, parties, art exhibitions, city walks, and conceptual posters
• Social media: Xiaohongshu covers, WeChat article headers, podcast covers, and cultural commentary illustrations
• Brand materials: postcards, invitations, tickets, programs, menus, and packaging stickers
• Keepsakes: travel journals, photo album covers, and anniversary cards
• Books and publications: covers, title pages, chapter openers, and zine interiors
• Words: literary excerpts, poetry, and personal declarations

All of these formats can use a single ink to reduce production costs while retaining a distinctive visual identity.

How it works

1  Read the input       →  identify subject, intent, words, and image role
2  Choose the layout    →  image, specimen, declaration, object field, overprint, journal, or cover
3  Assign the plates    →  default to two assigned roles; switch to one plate when explicitly requested
4  Compose the page     →  preserve 25%–55% silence and add one deliberate disruption
5  Generate and inspect →  check ink count, identity, hierarchy, texture, and originality

Ink system

One-ink palette: Cobalt, Royal Blue, Botanical Green, Mint Green, Terracotta Orange, Signal Red, Aubergine, and Charcoal.

Swatch	Ink	Hex
	Cobalt / Ultramarine	#2148B8
	Royal Blue	#2058D4
	Botanical Green	#008A4B
	Mint Green	#5EB783
	Terracotta Orange	#C65F38
	Signal Red	#C83232
	Aubergine	#63365F
	Charcoal	#30343A

Two-ink recipes: Powder Blue + Signal Red, Cobalt + Terracotta, Botanical Green + Oxblood, Charcoal + Signal Red, Electric Blue + Carbon, Mint Green + Charcoal, Ultramarine + Safety Orange, Cyan + Brick Red, and Tangerine + Slate Blue.

Swatches	Two-ink recipe	Hex
	Powder Blue + Signal Red	#9EB8D3 + #C83232
	Cobalt + Terracotta	#2148B8 + #C65F38
	Botanical Green + Oxblood	#008A4B + #8F3434
	Charcoal + Signal Red	#30343A + #C83232
	Electric Blue + Carbon	#173AE3 + #242321
	Mint Green + Charcoal	#5EB783 + #302D2E
	Ultramarine + Safety Orange	#263E99 + #E55D2B
	Cyan + Brick Red	#159DDA + #B64032
	Tangerine + Slate Blue	#E46C2D + #4773A5

In two-ink work, the dominant plate normally carries 70%–85% of the printed area. The accent plate carries 15%–30% and must have a specific job such as dates, annotations, selected objects, or overprint intersections. The substrate is not a third color, and the darker color created where two plates overlap is not a third ink.

Substrate is adaptive, not nostalgic by default: Neutral White #FAFAF7 supports crisp cultural, social, event, and image-led work; Cool Gray #E9E9E5 supports architecture, technology, charcoal-led systems, and restrained branding; Pale Beige #F5F1E8 supports tactile, travel, food, intimate, archival, or explicitly nostalgic subjects. Limited inks and halftone do not automatically imply vintage styling.

Visual rules

1. No more than two printing inks. Controlled two-ink is the default: 70%–85% dominant plate and 15%–30% accent plate, each with a distinct role. Explicit one-ink requests use one plate.
2. Paper stays visible. The result is a printed page, not a digitally tinted monochrome wash.
3. Mechanical reproduction leads. Photographs become dots, grain, clipped highlights, ink pooling, and mild registration drift between plates.
4. Silence has structure. Empty paper occupies 25%–55% of the canvas and controls pacing.
5. Type has tension. The largest text is 5–12 times the microcopy size, using no more than three type voices.
6. Identity stays intact. Supplied people, objects, and scenes remain recognizable.
7. References are grammar, not templates. At least four structural variables change from every supplied reference.

Not this

• not a full-color photograph with a monochrome filter
• not arbitrary two-color decoration or more than two printing plates
• not a glossy mockup, 3D render, gradient poster, or cinematic scene
• not a centered template, card grid, sticker collage, or decorative blob system
• not dense scrapbook grunge or torn-paper styling
• not automatically retro, yellowed, sepia, distressed, or nostalgic because the work uses halftone or limited inks
• not marketing copy, invented branding, fake sponsors, URLs, or QR codes
• not a reconstruction of a reference poster or artist signature

Install

Clone the repository into your Claude Code skills directory:

git clone https://github.com/yanliudesign/mono-color-skill.git \
	~/.claude/skills/mono-color

Restart Claude Code after installation. Other agent environments can load SKILL.md as the skill entry point.

Try it

Use mono-color to make a vertical poster about a midnight convenience store.
The exact headline is “still open”.

Turn this portrait into a cobalt one-ink editorial zine cover.
Keep the person's identity and expression.

Create a botanical-green risograph field note about ferns.
The title is “field note 07”.

Create an Ultramarine + Safety Orange overprint poster about city cycling.
Let the bicycle and oversized title cross in selected areas.

Turn this product into a Cyan + Brick Red repeated-object cover.
Keep one open zone for the title and factual microcopy.

Make a Signal Red one-ink party poster for a rooftop gathering.
Use “after sunset” as the headline and keep the date small.

Design a Charcoal + Signal Red exhibition poster about concrete architecture.
Use the red plate only for the date, location, and one geometric interruption.

Create a cobalt city-walk poster from this street photograph.
Turn the buildings into coarse halftones and title it “north by foot”.

Make a Terracotta Orange Xiaohongshu cover about a weekend flea market.
Use one oversized Chinese headline and leave at least one third of the paper empty.

Turn this host portrait into an Aubergine one-ink podcast cover.
Keep the face recognizable and use “the quiet hour” as the episode title.

Create a Botanical Green + Oxblood invitation for an independent bookstore opening.
Let green carry the paper texture and image; reserve oxblood for event details.

Transform these travel photographs into a Cobalt + Terracotta postcard series.
Keep the same grid across the set, but vary each crop and handwritten annotation.

Design a Mint Green + Charcoal poetry title page for the line “we kept the window open”.
Use no photograph, generous paper space, and one small archival-style note.

Delivery format

One run returns:

1. a generated raster image when image-generation tools are available;
2. the exact production-ready prompt used for generation;
3. a recipe naming the print mode, exact ink palette, layout family, type pairing, print process, and originality changes.

If image generation is unavailable, the skill returns the production-ready prompt and states the limitation.

Stability and validation

Before prompt compilation, the skill resolves every request into a fixed recipe manifest. Unspecified requests use a 3:4 ratio, Neutral White substrate, contemporary editorial direction, 35% empty substrate, and deterministic palette and layout rules. The substrate may switch to Cool Gray or Pale Beige when the image and ink contrast call for it. Supplied photos default to faithful reproduction; requests for abstract, artistic, loose, experimental, or less realistic treatment switch to deterministic symbol extraction that preserves 2-4 identity anchors. Explicit user choices still take precedence within the two-ink and originality limits.

The design-system/ catalogs make the visual grammar reusable and inspectable. They separate color tokens, typography roles, composition geometry, carrier-specific signals, visual rhythm, and controlled print imperfections from the prose workflow. Catalog IDs are the shared contract between reference boards, recipes, and validation.

design-system/rhythm.json defines relaxation as uneven energy rather than uniformly reduced intensity. Each page selects one audacious focal event—oversized type, an extreme crop, one giant detail, a concentrated overprint, or an abnormal scale relationship—then releases the rest through paper, pale screening, and sparse functional type. Without a supplied photograph, people become 2-4 identifying anchors and partial crops instead of complete stock figures or a safe headline-left/photo-right split. Empty paper and unresolved edges now respond to the focal event instead of fixed quotas.

Controlled chance stays in the reproduction layer: contemporary work selects 0-2 restrained effects, while tactile, vintage, or archival-aging work selects 2-3 bounded effects such as uneven ink density, dry-edge breakup, halftone drift, registration drift, or one broken gesture. The stable recipe seed preserves the same marks across retries without moving the composition or reducing text readability.

The twelve-source evidence map in design-system/reference-analysis.json also compiles into four focused 1800×2400 boards:

Typography

Color

Layout

Style

Regenerate the complete board or the four reference-derived boards after editing a catalog:

python3 scripts/build_design_system_board.py
python3 scripts/build_reference_system_boards.py

The evaluation contract covers defaults, supplied portraits, botanical work, overprint, event information, long-form text, prompt-only output, conflicting color requests, repeated objects, and reference-copying requests. Run it locally with:

python3 scripts/validate_evals.py
python3 scripts/validate_design_system.py

GitHub Actions runs the same contract on every pull request and push to main.

Repository layout

mono-color-skill/
├── .github/workflows/ # Continuous validation
├── design-system/    # Machine-readable color, composition, rhythm, and print patterns
├── examples/         # Visual references shown in the READMEs
├── scripts/          # Evaluation and design-system validators
├── swatches/         # One-ink and two-ink palette previews
├── SKILL.md          # Trigger rules, visual system, workflow, and quality gate
├── README.md         # English documentation
├── README.zh.md      # 中文说明
├── CHANGELOG.md      # Release history
└── evals/
		├── evals.json    # Representative prompts and deterministic assertions
		└── schema.json   # Evaluation contract schema

Originality

This skill extracts system-level qualities such as palette, print process, spacing, hierarchy, and communication tone. It does not copy a reference's composition, wording, labels, logos, border system, or distinctive arrangement.

When a user supplies a photograph, the subject is preserved as content while the crop, screening, grid, type placement, and metadata treatment are newly constructed.

Created by Dreameryanyan · LinkedIn · X