opengraph

Procedural OGP image generator for vimee.

How it works

Generates a 1200x630 OGP image with:

• Procedural background — Color blobs + gaussian blur create a unique gradient-mesh per input text
• Deterministic — Same text always produces the same image (FNV-1a hash → seed)
• SVG icon — vimee.svg is rasterized at runtime via oksvg
• Film grain — Multiplicative noise preserves hue
• 2x supersampling — Renders at 2400x1260, downscales to 1200x630 with bilinear filtering

Requirements

• Go 1.22+

Usage

# Build
make build

# Generate with defaults
make generate

# Generate with custom text
make generate TITLE="My Project" SUBTITLE="A cool description"

# Or run directly
go run . "title" "subtitle"
go run . "title"  # subtitle is optional

# Clean up
make clean

Output

og.png (1200x630 PNG) in the current directory.

Customization

Edit constants in main.go:

Constant	Description
titleSize / subtitleSize	Font sizes (at 2x resolution)
blurR	Gaussian blur radius for background
numBlobs	Number of color blobs
grainDensity	Fraction of pixels affected by grain (0.0-1.0)
grainStrength	Max noise percentage (+/-)
palette	Color palette for background blobs

Changing the font

Replace the embedded font file and update the //go:embed directive:

//go:embed fonts/YourFont.ttf
var fontData []byte

Changing the icon

Replace vimee.svg in the project root. The SVG is rasterized at runtime — no pre-conversion needed.

Dependencies

• fogleman/gg — Text rendering
• golang/freetype — TrueType font parsing
• srwiley/oksvg + rasterx — SVG rasterization
• golang.org/x/image — Bilinear downscaling