I'm trying to export a texure where the positions of points are stored as colors. The problem I am having is that when I export a png sequence Houdini is clamping the values to not exceed 1. I am exporting as a 16 bit float and under the Metadata tab I have set the png option to unpremultiplied. I'm not sure what else to set and not sure why it is clamping my values since png's should be able to store pixel values above 1. Any ideas?

Are you 100% sure about the values above 1?

Why not use exr instead?

Yeah, I was under the impression .png went up to 16-bit-per-channel integer format (0-65535 values, often interpreted as a 0-1 float range, but not stored that way).
I don't think I've come across a floating point implementation.
I think .tiff may do it, if you need to avoid .exr for whatever reason.

Ah ok thank you yeah I thought it was floating point not integer that is where I went wrong