NativeImageLoader's asMatrix doesn't seem to work for PNG images

1

Using datavec’s NativeImageLoader’s asMatrix , when I convert any PNG image to an INDArray, the INDArray is entirely filled with value 6418. That seems wrong! If instead convert a JPG image to INDArray, the INDARRAY looks more reasonable, but there are still a lot of 6148s and other large values, and the values don’t match what I see when I look at the pixels in the BufferedImage. Is the Alpha channel affecting the values ? The documentation on asMatrix is sketchy. Is there someplace that explains the conversion? A requirements doc?

2

Using org.datavec.image.loader.ImageLoader seems to work better:

 public static BufferedImage toImage(final INDArray features) {
        final INDArray slicedTransposedFeatures = features.slice(0).slice(0).transpose();
        return ImageLoader.toImage(slicedTransposedFeatures);
 }
3

@DonaldAlan mind filing an issue with a reproducer so we can look at this thanks!

4

I was unable to reproduce this in a simple test case. (And I noticed that jpgs are lossy, while pngs retain exact values, as expected).