package tiff

import "golang.org/x/image/tiff"

Package tiff implements a TIFF image decoder and encoder.

The TIFF specification is at http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf

Index ¶

• func Decode(r io.Reader) (img image.Image, err error)
• func DecodeConfig(r io.Reader) (image.Config, error)
• func Encode(w io.Writer, m image.Image, opt *Options) error
• type CompressionType
• type FormatError
• func (e FormatError) Error() string
• type Options
• type UnsupportedError
• func (e UnsupportedError) Error() string

Functions ¶

func Decode ¶

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

Decode reads a TIFF image from r and returns it as an image.Image. The type of Image returned depends on the contents of the TIFF.

func DecodeConfig ¶

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

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

func Encode ¶

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

Encode writes the image m to w. opt determines the options used for encoding, such as the compression type. If opt is nil, an uncompressed image is written.

Types ¶

type CompressionType ¶

type CompressionType int

CompressionType describes the type of compression used in Options.

const (
	Uncompressed CompressionType = iota
	Deflate
	LZW
	CCITTGroup3
	CCITTGroup4
)

Constants for supported compression types.

type FormatError ¶

type FormatError string

A FormatError reports that the input is not a valid TIFF image.

func (FormatError) Error ¶

func (e FormatError) Error() string

type Options ¶

type Options struct {
	// Compression is the type of compression used.
	Compression CompressionType
	// Predictor determines whether a differencing predictor is used;
	// if true, instead of each pixel's color, the color difference to the
	// preceding one is saved. This improves the compression for certain
	// types of images and compressors. For example, it works well for
	// photos with Deflate compression.
	Predictor bool
}

Options are the encoding parameters.

type UnsupportedError ¶

type UnsupportedError string

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

func (UnsupportedError) Error ¶

func (e UnsupportedError) Error() string

Source Files ¶

buffer.go compress.go consts.go reader.go writer.go

Directories ¶