This is really just quick reference for myself. You can add image metadata to Text nodes in Nuke using the following TCL commands.
filesize [metadata input/filesize]
format [metadata input/filereader]
compression [metadata exr/compressionName]
bits [metadata input/bitsperchannel]
width [metadata input/width]
height [metadata input/height]
frame [format %04d [metadata input/frame]]