After completing a moon mosaic and converting same to Greyscale, most of the time I was annoyed about the ugly squares protruding from the moon: a result of the seaming and stitching process. Then Cor Berrevoets told me how to use IRIS to get rid of all that noise.

IRIS noise erase

For my moon mosaics I used the following procedure:

• Save your final image in a separate directory (e.g. temp)
• Rename to eg Moon1.bmp
• Load into IRIS via File/conversion as follows:
• name: Moon
• as you want black/white select the radio button for black and white
• panchro name: temporary output file name
• number: 1 (because you only have one final frame)
• OK
• Now you have a FIT file with the output name you just selected
• Use left mouse button to select (box) part of the area you want to erase
• Processing menu: Offset Normalisation of a sequence
• Generic name: M
• Normalisation 0
• Output name: whatever you want
• Number of images: 1
• Chckmark box selected area
• OK
• Surprise: the noise has disappeared!!!!
• Redo for other areas
• When ready: save as BMP and you are ready ...