dmtxread cannot small datamatrixes

[nicolasfranck]

I've played around with another datamatrix generator like https://github.com/boombuler/barcode (golang).

That generator generates datamatrixes where the dimensions are not determined
by module size or margin.

Unfortunately dmtxread cannot read them: it exits with status 1, and no error.

Other readers like https://online-barcode-reader.inliteresearch.com/ can read it.

dmtxread does work if I produce a datamatrix with the "expected" dimensions, i.e. the dimensions
dmtwrite would produce if it were to write the same input text.

My golang code that produces png (stdout!) that dmtxread can read:

package main

import (
  "image/png"
  "os"
  "github.com/boombuler/barcode"
  "github.com/boombuler/barcode/datamatrix"
  "fmt"
)

func main() {

  // Create the barcode
  code, c_err := datamatrix.Encode("hello")

  if c_err != nil {
    fmt.Println(os.Stderr,"error: %s",c_err)
    os.Exit(1)
  }

  //without this line, dmtxread fails to read it
  code,_ = barcode.Scale(code,80,80)

  // encode the barcode as png
  png.Encode(os.Stdout, code)
}

As stated: withouth scaling statement, dmtxread fails to read it.

Any idea?

See here my resulting png:

[msva]

Well, neither ZXing on my android smartphone was able to decode this image per se, until I placed it on white background.

I guess, they just needs some "spacing" (at least for the size of one dot-module on each side) to handle such images.

Although, it is just a guess, since I'm too busy for now to look for the real behaviour in the code and/or debug that...