[Openexr-devel] Arbitrary levels in a tiled exr image

[est]

Hi!

I'm developing an image compositor that works with OpenEXR images.
I'm adding image proxies support and I'd like to write full, half, third 
and
quarter resolution images to an EXR file.
From the documentation, I have the impression that tiled files only 
support
mipmap levels. I can generate the third resolution scaling down the half 
image
if needed, but is there a better way to do this? Subsampled channels?

Thank you

Est.