silx view: Large 2D datasets are open about silx

[vasole]

I guess the dataset does not identify itself as being of spectrum type.

What about deciding between spectrum and image based on the ratio between rows and columns when no previous visualization has taken place? I guess images will usually not have orders of magnitude between the two dimensions.

[t20100]

There's no attributes or NXdata description, just a plain 2D dataset.

The ratio can be a good way to discriminate.
I was also considering the number of pixels to give an idea how demanding it will be to load it.
We probably don't want to display straight away a 1e6 x 1e6 pixel image either.