Jay Brown
160 lines
7.0 KiB
Go
160 lines
7.0 KiB
Go
// Copyright 2014 <chaishushan{AT}gmail.com>. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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Package tiff offers a rich TIFF/BigTIFF/GeoTIFF decoder/encoder for Go.
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The Classic TIFF specification is at http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf
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The Big TIFF specification is at http://www.remotesensing.org/libtiff/bigtiffdesign.html
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The Geo TIFF specification is at http://www.remotesensing.org/geotiff/spec/geotiffhome.html
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TIFF Tags: http://www.awaresystems.be/imaging/tiff/tifftags.html
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Features:
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1. Support BigTiff
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2. Support decode multiple image
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3. Support decode subifd image
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4. Support RGB format
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5. Support Float DataType
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6. More ...
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Example:
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package main
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"log"
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"path/filepath"
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tiff "github.com/chai2010/tiff"
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)
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func main() {
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var data []byte
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var err error
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var files = []string{
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"./testdata/BigTIFFSamples/BigTIFFSubIFD8.tif",
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"./testdata/multipage/multipage-gopher.tif",
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}
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for _, filename := range files {
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// Load file data
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if data, err = ioutil.ReadFile(filename); err != nil {
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log.Fatal(err)
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}
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// Decode tiff
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m, errors, err := tiff.DecodeAll(bytes.NewReader(data))
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if err != nil {
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log.Println(err)
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}
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// Encode tiff
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for i := 0; i < len(m); i++ {
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for j := 0; j < len(m[i]); j++ {
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newname := fmt.Sprintf("%s-%02d-%02d.tiff", filepath.Base(filename), i, j)
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if errors[i][j] != nil {
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log.Printf("%s: %v\n", newname, err)
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continue
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}
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var buf bytes.Buffer
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if err = tiff.Encode(&buf, m[i][j], nil); err != nil {
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log.Fatal(err)
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}
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if err = ioutil.WriteFile(newname, buf.Bytes(), 0666); err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Save %s ok\n", newname)
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}
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}
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}
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}
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Report bugs to <chaishushan@gmail.com>.
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Thanks!
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*/
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package tiff
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/*
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The Classic TIFF specification is at http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf
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The Big TIFF specification is at http://www.remotesensing.org/libtiff/bigtiffdesign.html
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The Geo TIFF specification is at http://www.remotesensing.org/geotiff/spec/geotiffhome.html
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Classic TIFF Structure:
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+------------------------------------------------------------------------------+
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| Classic TIFF Structure |
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| IFH |
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| +-----------------+ |
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| | II/MM ([2]byte) | |
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| +-----------------+ |
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| | 42 (uint16) | IFD |
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| +-----------------+ +------------------+ |
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| | Offset (uint32) |---->| Num (uint16) | |
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| +-----------------+ +------------------+ |
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| | Entry ([12]byte) | |
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| +------------------+ |
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| | Entry ([12]byte) | |
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| +------------------+ |
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| | ... | IFD |
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| +------------------+ +------------------+ |
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| IFD Entry | Offset (uint32) |--->| Num (uint16) | |
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| +-----------------+ +------------------+ +------------------+ |
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| | Tag (uint16) | | Entry ([12]byte) | |
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| +-----------------+ +------------------+ |
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| | Type (uint16) |<-------------------------| Entry ([12]byte) | |
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| +-----------------+ +------------------+ |
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| | Count (uint32) | | ... | |
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| +-----------------+ +------------------+ |
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| | Offset (uint32) |---> Value | Offset (uint32) |--->NULL |
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| +-----------------+ +------------------+ |
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+------------------------------------------------------------------------------+
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Big TIFF Structure:
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+------------------------------------------------------------------------------+
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| Big TIFF Structure |
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| IFH |
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| +-----------------+ |
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| | II/MM ([2byte]) | |
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| +-----------------+ |
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| | 43 (uint16) | |
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| +-----------------+ |
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| | 8 (uint16) | |
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| +-----------------+ |
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| | 0 (uint16) | IFD |
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| +-----------------+ +------------------+ |
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| | Offset (uint64) |---->| Num (uint64) | |
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| +-----------------+ +------------------+ |
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| | Entry ([20]byte) | |
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| +------------------+ |
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| | Entry ([20]byte) | |
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| +------------------+ |
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| | ... | IFD |
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| +------------------+ +------------------+ |
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| IFD Entry | Offset (uint64) |--->| Num (uint64) | |
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| +-----------------+ +------------------+ +------------------+ |
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| | Tag (uint16) | | Entry ([12]byte) | |
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| +-----------------+ +------------------+ |
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| | Type (uint16) |<-------------------------| Entry ([12]byte) | |
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| +-----------------+ +------------------+ |
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| | Count (uint64) | | ... | |
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| +-----------------+ +------------------+ |
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| | Offset (uint64) |---> Value | Offset (uint64) |--->NULL |
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| +-----------------+ +------------------+ |
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+------------------------------------------------------------------------------+
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*/
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