You can use an Image Service directly in a geoprocessing tool by first using 'Make Image Server Layer'.
There is no need to cut the image and craete a new pne. Instead modify the Image Service definition. You can individually edit the footprint of the different rasters to exlude areas that are not to be seen. Alternativly to clip something gloablly edit the Boundary layer and then Recompute Footprint by Clipping to Boundary. Any pixels outside the footprints will be clipped without the need to creating any new dataset. Scuh clipped images work well in ArcGIS applicaitons since transparancy is correctly handled. IE the image can be transitted using JPEG compression, but a mask is also transmitted to cleanly handle the transparent areas.Note that in ArcGIS 10 the desktop can also do this. Any raster can be clipped using a graphic and the result stored as a LYR file that can be used in applications such as ArcGIS Explorer.
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