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  • import "image/jpeg"

  • Overview

  • Index

概觀

包jpeg實(shí)現(xiàn)了一個(gè)JPEG圖像解碼器和編碼器。

JPEG在ITU-T T.81中定義:http : //www.w3.org/Graphics/JPEG/itu-t81.pdf。

索引

  • Constants

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

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

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

  • type FormatError

  • func (e FormatError) Error() string

  • type Options

  • type Reader

  • type UnsupportedError

  • func (e UnsupportedError) Error() string

包文件

fdct.go huffman.go idct.go reader.go scan.go writer.go

常量

DefaultQuality是默認(rèn)的質(zhì)量編碼參數(shù)。

const DefaultQuality = 75

func Decode

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

Decode從r讀取JPEG圖像并將其作為image.Image返回。

func DecodeConfig

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

DecodeConfig返回JPEG圖像的顏色模型和尺寸,而不用解碼整個(gè)圖像。

func Encode

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

Encode使用給定的選項(xiàng)將圖像m以JPEG 4:2:0基準(zhǔn)格式寫(xiě)入w。如果傳遞nil * Options,則使用默認(rèn)參數(shù)。

type FormatError

FormatError報(bào)告輸入不是有效的JPEG。

type FormatError string

func (FormatError) Error

func (e FormatError) Error() string

type Options

Options是編碼參數(shù)。質(zhì)量范圍從1到100,越高越好。

type Options struct {
        Quality int}

type Reader

已棄用:Reader已棄用。

type Reader interface {
        io.ByteReader
        io.Reader}

type UnsupportedError

UnsupportedError報(bào)告輸入使用有效但未實(shí)現(xiàn)的JPEG功能。

type UnsupportedError string

func (UnsupportedError) Error

func (e UnsupportedError) Error() string
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