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Chalk Lector key visual
Hand-drawn · chalk-lector

Chalk Lector

Chalk and dry pastel on a blackboard, with eraser smudges and the persuasiveness only a hand-drawn diagram carries.

SubjectsProduct · Character
ModelsGPT Image · Flux
Cases4
Use this style →Remix

Style × subject matrix

4 contexts
Chalk Lector · Character
Character · case image
Chalk Lector · Scene
Scene · case image
Chalk Lector · Architecture
Architecture · case image
Chalk Lector · Product
Product · case image

Visual DNA

7 axes · 0–100

Seven adjustable axes set the character of the image: line rigorous or organic, colour muted or rich.

Line
TechnicalOrganic
84
Color
MutedVibrant
30
Lighting
DramaticSoft
60
Texture
CleanMaterial
88
Detail
MinimalDense
76
Depth
FlatCinematic
34
Mood
QuietEnergetic
48

Acceptance criteria

3 bans · 3 fail conditions

Check each frame against these: bans must not appear at all, and any fail condition voids the result.

Anchor

The key visual is the only anchor: chalk line quality, the three-color limit, and smudge density are set by it; a new knowledge point must not be drawn cleaner.

Bans · prepended to the prompt by priority

  1. 01
    no smooth continuous strokesChalk lines must be broken and gone over repeatedly
  2. 02
    no more than three colors in totalAny color beyond white, pale yellow, and pale red ruins the board-writing feel
  3. 03
    no glossy surfaces, no reflectionsOnce a glazed surface appears, the classroom is gone

Fail conditions

  • ✗
    no eraser smudges or chalk dust
  • ✗
    no arrows, circles or leader lines interrupt the layout
  • ✗
    lines close cleanly with sharp edges
Pass threshold

It should look like the diagram left on a blackboard after a lesson, there to be photographed and carried away.

Style recipe

11 reusable elements

The recipe is the wording this style carries into every prompt, so you don't rewrite it.

Identity

Blackboard chalk explanation diagram

Composition

Board-writing layout, arrows and circled annotations allowed

Line

Chalk breaks and restrikes

Color

Three chalk colors: white, pale yellow, pale red

Lighting

Classroom top light, slight reflection on the board

Material

Blackboard, chalk, dry pastel

Texture

Powder and eraser smudges

Character

Diagrammatic, geometric, explanatory

Atmosphere

Rational, restrained, instructional

Negative

glossy, neon, 3d render, photo

Reference

Physics lecture boards / old textbook illustrations

Style object

YAML

The style object is the recipe, criteria and DNA as machine-readable text: download it, or feed it to any model.

Download .yaml
style: id: chalk-lector name: 粉笔板书 name_en: Chalk Lector category: [手绘, 产品, 人物] visual_dna: line: {organic: 84, precision: 16} color: {saturation: 30, warmth: 70} lighting: {softness: 60, contrast: 40} texture: {material: 88, clean: 12} detail: {density: 76} depth: {cinematic: 34} mood: {energy: 48} composition: depth: flat framing: 板书式排布，允许箭头与圈注 subjects: [产品, 人物] models: [GPT Image, Flux] recipe: identity: 黑板粉笔讲解图 line: 粉笔的断续与重描 color: 白、浅黄、淡红三色粉笔 lighting: 教室顶光，黑板轻微反光 material: 黑板、粉笔、干性色粉 texture: 粉末与擦痕 character: 图解化、几何、说明性 atmosphere: 理性、克制、有教学感 negative: [glossy, neon, 3d render, photo] reference_notes: 物理课堂板书 / 老教材插图 constraints: anchor: 主视觉即唯一锚点：粉笔线形态、三色限制与擦痕密度以它为准；新知识点不得画得更干净。 bans: # 按优先级，前置到提示词 - no smooth continuous strokes - no more than three colors in total - no glossy surfaces, no reflections fail_if: - no eraser smudges or chalk dust - no arrows, circles or leader lines interrupt the layout - lines close cleanly with sharp edges pass: 应像一堂课讲完后留在黑板上的图解，可以被拍照带走。