Recently, I sent two photos to a professional photo lab to have canvas prints done. This very well known and respected lab was to do some color work to balance colors in my two sent photos. I sent them edited niff photos. After receiving these photos they requested that I send them nef photos since the edited niff photos were "soft". After receiving my nef photos they requested that I either send them jpeg or pnd files which I did.
Finally, after all these different formats were sent they informed me that the best that they can do with these two photos was produce soft pixelated photos. I informed them to credit my account and charge me only for their time and effort to this point and do not continue with the originally ordered canvas prints.

For my next submittal photos they requested that I send them only unedited original raw nef prints so that they can perform their work. This is a very respected lab located on the west coast.

In working with professional labs is it your experience to send unedited photos and allow them to perform their work? I would appreciate your thoughts and experiences.