Rich TIFF/BigTIFF/GeoTIFF decoder/encoder for Go (Pure Go/Zero Dependencies)

chai2010

Last update: Nov 16, 2022

Related tags

Images tools tiff

Overview

Go语言QQ群: 102319854, 1055927514
凹语言(凹读音“Wa”)(The Wa Programming Language): https://github.com/wa-lang/wa

TIFF for Go

Features:

Support BigTiff
Support decode multiple image
Support decode subifd image
Support RGB format
Support Float DataType
More ...

Install

go get github.com/chai2010/tiff
go run hello.go

Example

package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"log"
	"path/filepath"

	tiff "github.com/chai2010/tiff"
)

func main() {
	var data []byte
	var err error

	var files = []string{
		"./testdata/BigTIFFSamples/BigTIFFSubIFD8.tif",
		"./testdata/multipage/multipage-gopher.tif",
	}
	for _, filename := range files {
		// Load file data
		if data, err = ioutil.ReadFile(filename); err != nil {
			log.Fatal(err)
		}

		// Decode tiff
		m, errors, err := tiff.DecodeAll(bytes.NewReader(data))
		if err != nil {
			log.Println(err)
		}

		// Encode tiff
		for i := 0; i < len(m); i++ {
			for j := 0; j < len(m[i]); j++ {
				newname := fmt.Sprintf("%s-%02d-%02d.tiff", filepath.Base(filename), i, j)
				if errors[i][j] != nil {
					log.Printf("%s: %v\n", newname, err)
					continue
				}

				var buf bytes.Buffer
				if err = tiff.Encode(&buf, m[i][j], nil); err != nil {
					log.Fatal(err)
				}
				if err = ioutil.WriteFile(newname, buf.Bytes(), 0666); err != nil {
					log.Fatal(err)
				}
				fmt.Printf("Save %s ok\n", newname)
			}
		}
	}
}

BUGS

Report bugs to [email protected].

Thanks!

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Comments

Does this project support tif directories?

Does this project support tif directories as specified here? Basically it is just storing multiple images in the same tiff file. It is very common for storing pyramided images which is common in Deep Zoom images for ultra high resolution images as well as medical images.

I see that you support bigtiff, but I see no way of specifying what directory you want (as I've done with the c library) and so I'm wondering if I'm missing something? Thanks!

opened by ricochet2200 2
Flush LZW decoder output in case of error

I have encountered elevation-data GeoTIFFs where some of the blocks are missing the terminating end-of-information code in the LZW stream. That is, all the data is there, but an exception (either "unexpected eof" or "invalid code") is thrown at the end. These files are accepted e.g. by QGIS. This commit adds flushes of the output data in these circumstances, which enables the calling code to check if there is enough decoded data and silently proceed in this case.

opened by jlahd 0