jpeg

jpeg

https://pkg.go.dev/image/jpeg@go1.20.1

Package jpeg implements a JPEG image decoder and encoder.

JPEG is defined in ITU-T T.81: https://www.w3.org/Graphics/JPEG/itu-t81.pdf.

常量

View Source

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const DefaultQuality = 75

DefaultQuality is the default quality encoding parameter.

变量

This section is empty.

函数

func Decode

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func Decode(r io.Reader) (image.Image, error)

Decode reads a JPEG image from r and returns it as an image.Image.

func DecodeConfig

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func DecodeConfig(r io.Reader) (image.Config, error)

DecodeConfig returns the color model and dimensions of a JPEG image without decoding the entire image.

func Encode

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

Encode writes the Image m to w in JPEG 4:2:0 baseline format with the given options. Default parameters are used if a nil *Options is passed.

类型

type FormatError

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type FormatError string

A FormatError reports that the input is not a valid JPEG.

(FormatError) Error

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func (e FormatError) Error() string

type Options

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type Options struct {
	Quality int
}

Options are the encoding parameters. Quality ranges from 1 to 100 inclusive, higher is better.

type Reader <- DEPRECATED

type UnsupportedError

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type UnsupportedError string

An UnsupportedError reports that the input uses a valid but unimplemented JPEG feature.

(UnsupportedError) Error

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func (e UnsupportedError) Error() string