Batch process autoscale problem



I am trying to convert .czi files into .tiff at once using the Process/Batch/Macro . I would like to preserve the original brightness and contrast of all images. The Batch plug-in uses the Bio-formats to open the .czi and and also automatically uses the “autoscale” command that messes-up the original brightness. Is there any way how to switch off the “autoscale” ?
Thanx !

batch process|478x500