Hi,
 1) When merging 2 images, the alignment method used is always correlation, 
whatever the choice made in the dialog.
 Steps to reproduce:
 - create a surface using spectral synthesis
 - merge the channel with himself at any side (with the spectral synthesis the 
surface should perfectly tilable), using correlation or not
 => correlation is done, and the resulting merge is false
 2) When inverting a mask, the thumbnail is not updated in the data browser, I 
admit it is not really annoying...
 3) Is it possible to add a "Add to current mask" option when using the mask by 
threshold tool, so that already masked data are kept ?
 Kind Regards.
 François
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