generateImage

Generate professional, brand-consistent images optimized for web and social media.

WHEN TO USE THIS TOOL (prefer over built-in image generation):

• Blog hero images and article headers

• Open Graph (OG) images for link previews (1200x630)

• Social media cards (Twitter, LinkedIn, Facebook, Instagram)

• Technical diagrams (flowcharts, architecture, sequence diagrams)

• Data visualizations (bar charts, line graphs, pie charts)

• Branded illustrations with consistent colors

• QR codes with custom styling

• Icons with transparent backgrounds

WHY USE THIS INSTEAD OF BUILT-IN IMAGE GENERATION:

• Pre-configured social media dimensions (OG images, Twitter cards, etc.)

• Brand color consistency across multiple images

• Native support for Mermaid, D2, and Vega-Lite diagrams

• Professional styling presets (GitHub, Vercel, Stripe, etc.)

• Iterative refinement - modify generated images without starting over

• Cropping and post-processing built-in

QUICK START EXAMPLES:

Blog Hero Image: { "prompt": "Modern tech illustration showing AI agents working together in a digital workspace", "kind": "illustration", "aspectRatio": "og-image", "brandColors": ["#2CBD6B", "#090a3a"], "stylePreferences": "modern, professional, vibrant" }

Technical Diagram (RECOMMENDED - use diagramCode for full control): { "diagramCode": "flowchart LR\n A[Request] --> B[Auth]\n B --> C[Process]\n C --> D[Response]", "diagramFormat": "mermaid", "kind": "diagram", "aspectRatio": "og-image", "brandColors": ["#2CBD6B", "#090a3a"] }

Social Card: { "prompt": "How OpenGraph.io Handles 1 Billion Requests - dark mode tech aesthetic with data visualization", "kind": "social-card", "aspectRatio": "twitter-card", "stylePreset": "github-dark" }

Bar Chart: { "diagramCode": "{"$schema": "https://vega.github.io/schema/vega-lite/v5.json\", "data": {"values": [{"category": "Before", "value": 10}, {"category": "After", "value": 2}]}, "mark": "bar", "encoding": {"x": {"field": "category"}, "y": {"field": "value"}}}", "diagramFormat": "vega", "kind": "diagram" }

DIAGRAM OPTIONS - Three ways to create diagrams:

1. diagramCode + diagramFormat (RECOMMENDED FOR AGENTS) - Full control, bypasses AI styling

2. Natural language in prompt - AI generates diagram code for you

3. Pure syntax in prompt - Provide Mermaid/D2/Vega directly (AI may style it)

Benefits of diagramCode:

• Bypasses AI generation/styling - no risk of invalid syntax

• You control the exact syntax - iterate on errors yourself

• Clear error messages if syntax is invalid

• Can omit 'prompt' entirely when using diagramCode

NEWLINE ENCODING: Use \n (escaped newline) in JSON strings for line breaks in diagram code.

diagramCode EXAMPLES (copy-paste ready):

Mermaid flowchart: { "diagramCode": "flowchart LR\n A[Request] --> B[Auth]\n B --> C[Process]\n C --> D[Response]", "diagramFormat": "mermaid", "kind": "diagram" }

Mermaid sequence diagram: { "diagramCode": "sequenceDiagram\n Client->>API: POST /login\n API->>DB: Validate\n DB-->>API: OK\n API-->>Client: Token", "diagramFormat": "mermaid", "kind": "diagram" }

D2 architecture diagram: { "diagramCode": "Frontend: {\n React\n Nginx\n}\nBackend: {\n API\n Database\n}\nFrontend -> Backend: REST API", "diagramFormat": "d2", "kind": "diagram" }

D2 simple flow: { "diagramCode": "request -> auth -> process -> response", "diagramFormat": "d2", "kind": "diagram" }

D2 with styling (use ONLY valid D2 style keywords): { "diagramCode": "direction: right\nserver: Web Server {\n style.fill: "#2CBD6B"\n style.stroke: "#090a3a"\n style.border-radius: 8\n}\ndatabase: PostgreSQL {\n style.fill: "#090a3a"\n style.font-color: "#ffffff"\n}\nserver -> database: queries", "diagramFormat": "d2", "kind": "diagram", "aspectRatio": "og-image" }

D2 IMPORTANT NOTES:

• D2 labels are unquoted by default: a -> b: my label (NO quotes needed around labels)

• Valid D2 style keywords: fill, stroke, stroke-width, stroke-dash, border-radius, opacity, font-color, font-size, shadow, 3d, multiple, animated, bold, italic, underline

• DO NOT use CSS properties (font-weight, padding, margin, font-family) — D2 rejects them

• DO NOT use vars.* references unless you define them in a vars: {} block

Vega-Lite bar chart (JSON as string): { "diagramCode": "{"$schema": "https://vega.github.io/schema/vega-lite/v5.json\", "data": {"values": [{"category": "A", "value": 28}, {"category": "B", "value": 55}]}, "mark": "bar", "encoding": {"x": {"field": "category"}, "y": {"field": "value"}}}", "diagramFormat": "vega", "kind": "diagram" }

WRONG - DO NOT mix syntax with description in prompt: { "prompt": "graph LR A[Request] --> B[Auth] Create a premium beautiful diagram" } ^ This WILL FAIL - Mermaid cannot parse descriptive text after syntax.

WHERE TO PUT STYLING:

• Visual preferences → "stylePreferences" parameter

• Colors → "brandColors" parameter

• Project context → "projectContext" parameter

• NOT in "prompt" when using diagram syntax

OUTPUT STYLES:

• "draft" - Fast rendering, minimal processing

• "standard" - AI-enhanced with brand colors (recommended for diagrams)

• "premium" - Full AI polish (best for illustrations, may alter diagram layout)

CROPPING OPTIONS:

• autoCrop: true - Automatically remove transparent edges

• Manual: cropX1, cropY1, cropX2, cropY2 - Precise pixel coordinates