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Package tiff

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.

type CompressionType ¶

CompressionType describes the type of compression used in Options.

type CompressionType int

Constants for supported compression types.

const (
    Uncompressed CompressionType = iota
    Deflate
    LZW
    CCITTGroup3
    CCITTGroup4
)

type FormatError ¶

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

type FormatError string

func (FormatError) Error ¶

func (e FormatError) Error() string

type Options ¶

Options are the encoding parameters.

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
}

type UnsupportedError ¶

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

type UnsupportedError string

func (UnsupportedError) Error ¶

func (e UnsupportedError) Error() string

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