Hi I have used ER Mapper for this type of raster editing operation - in it you can draw a polygon around the tile areas you want to clip, you can set the null pixels to any value from 0-255 (to make it a specific shade of grey or a colour that isnt in the image), then make pixels of that value invisible in MI Pro. http://www.ermapper.com/
You can sucessfully mosaic raster images as well, clipped to hand drawn polygons per image in the mosaic to allow you to write a GeoTIFF of the whole mosaic. I generally use .ecw files tho as they are much smaller - from the ER Mapper website... " MapInfo Professional version 6.0 includes native support for ECW v2.0 imagery. MapInfo Professional is the industry's leading business software for visualizing and analyzing data from a geographic perspective." Hope that is some help Greg ------------------------------------------------------------------------------------------------------------ Greg Phillips BA PGDip MIFA Environment GIS Consultant Built and Natural Environment Northamptonshire County Council PO Box 163 County Hall Northampton NN1 1AX Tel: 01604 237433 Mob: 07799 832584 Northamptonshire Environment Network - http://www.nen.org.uk/ ------------------------------------------------------------------------------------------------------------ >>> "Berk Charlton" <[EMAIL PROTECTED]> 11/03/03 04:09pm >>> I'm fairly new at working with editing geotiff images, and I have a question regarding "clipping" them to geographic boundaries: I need to make all the pixels in the geotiff that fall outside a vector boundary a uniform color, such as black. What software can I use to do this? Berk Charlton ========================================== Meridian GeoSystems, Inc. www.meridiangeo.com [EMAIL PROTECTED] ==========================================
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