webp

package

v1.9.5 Latest Latest Go to latest Published: Oct 8, 2026 License: MIT Imports: 9 Imported by: 0

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github.com/danielriddell21/unum

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Documentation ¶

Overview ¶

Package webp encodes images in the lossless WebP (VP8L) format.

WebP's lossless mode routinely produces smaller files than PNG for the same pixels. This encoder implements the subtract-green transform, LZ77 backward references, a colour cache and canonical Huffman coding. It does not implement the predictor or cross-colour transforms, so on photographic content it will not match libwebp; on flat, palettised or synthetic images it is competitive.

Lossy WebP (VP8) encoding is out of scope: that is a separate intra-frame video codec rather than a variation on this one.

Index ¶

func Encode(w io.Writer, m image.Image) error
func EncodeToBytes(m image.Image) ([]byte, error)

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func Encode ¶

func Encode(w io.Writer, m image.Image) error

Encode writes m to w in the lossless WebP format.

The image is encoded exactly: decoding the result reproduces the original pixels. An image wider or taller than 16384 pixels cannot be represented and returns an error.

func EncodeToBytes ¶

func EncodeToBytes(m image.Image) ([]byte, error)

EncodeToBytes returns the lossless WebP encoding of m.

It is the allocation-friendly form of Encode for callers that need the bytes themselves, such as size comparisons against another encoder.

Types ¶

This section is empty.

Source Files ¶

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