woltapp/blurhash
Blurhash
A very compact representation of a placeholder for an image.
Features
- Fixed-Length String Formats - Stores image placeholder data in a fixed-length string format for predictable size and fast parsing.
- Blur Hash Placeholders - Generates compact hash strings representing blurred versions of images for faster perceived loading.
- Discrete Cosine Transforms - Uses a truncated discrete cosine transform to encode low-frequency image data into a compact string.
- BlurHash Decoders - Converts BlurHash strings back into blurred image representations for fast placeholder display.
- Component-Based Decoders - Reconstructs blurred images by decoding strings into horizontal and vertical color components.
- BlurHash Encoders - Creates short, text-based representations of images for fast placeholder display while the full image loads.
- Custom Alphabet Encodings - Provides a custom 83-character alphabet encoding for compact image placeholder strings.
- Platform-Agnostic Algorithms - Defines encoding and decoding logic as a pure algorithm for independent implementations across languages.
- BlurHash String Decoders - Converts BlurHash strings back into blurred image representations across multiple platforms.
- Average Color Derivation - Derives region-specific average colors from DCT coefficients for efficient placeholder generation.
- Placeholder-First Loading - Displays a blurred placeholder immediately while the full-resolution image loads asynchronously.
- SVG Manipulation Tools - Compact SVG placeholders for image blurring.
