Read multi-page tiff and extract images in golang

Question content

How to split multi-page tiff into images in Go? DecodeAll of image/tiff returns a TIFF containing image.image. But don't know how to convert each to image?

Correct answer

Since there isn't much information about the package you used in your question, I'm assuming you used github.com/chai2010/tiff Modules. It only contains the decodeall method. I used public multi-page tiff. Then I used the code from package Documentation. Anyway, I'm quoting it here

package main

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

    "github.com/chai2010/tiff"
)

func main() {
    b, err := ioutil.ReadFile("Multi_page24bpp.tif")
    if err != nil {
        panic(err)
    }

    // Decode tiff
    m, errors, err := tiff.DecodeAll(bytes.NewReader(b))
    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.tif", filepath.Base("Multi_page24bpp.tif"), 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)
        }
    }
}

It creates multiple tif images as per your requirement. I hope this is what you meant

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