There is an unsaved comment in progress. You will lose your changes if you continue. Are you sure you want to reopen the work item?
Handling of multichannel psd files
The implementation uses the CMYK converter to create RGB data.
For me the data shows completely black in Paint.NET (I guess this is because k is zero).
Multichannel is typically a collection of gray channels.
So I would create a merge of these gray channels to set R=G=B=Merge(G1,G2,...)
or just take the first channel R=G=B=G1.
To verify the result it is often quite good to compare the colors with an embedded thumbnail.
BTW: I'm looking for psd files using zip and zip-with-prediction encoding. Just for test purposes. Could you provide some?