XnView Software

Got a big problem trying to convert NEF files to JPG or PNG:

Doing it just by SAVE AS: everything works fine.
Trying it by batch processing: picture size will be changed from about 3000px X 2000px down to about 1500px X 1000px. I cannot find out the reason. No special options are chosen, nor any transformations (transformation list is completly empty).

Any suggestions? Thanks in advance!

option/Read-write-Write/RAW/High resolution

Thanks a lot for your answer and crucial hint: It's "options - general - red/write - read - cameraRAW - high resolution".
Now it works great. THX!!!