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func readImage(path string) []byte {

    buf1 := bytes.NewBuffer([]byte{})

    f, err := os.Open(path)

    if err != nil {

        panic(err)

    }

    defer f.Close()

    cb := make([]byte, 1024)

    for {

        n, err := f.Read(cb)

        if err != nil && err != io.EOF {

            panic(err)

        }

        if 0 == n {

            break

        }

        buf1.Write(cb[:n])

    }

    return buf1.Bytes()

}