Pixel limit of tone mapping persona

[Pano-mike]

Can anyone tell me what the current pixel limit is to the tone mapping module is?  It appears not to currently support 30000px files. Would love to see support for gigapixel image creators. Cannot open larger resolution .exr or tiff files in tone mapper and cannot save in Common file formats  above 4gb file limits

thanks for any assistance 

[DWright]

I will check with our developers if there is any size restrictions for using tone mapping