I have topographic maps in form of image files. In order to make a DEM, I need to make a mosaic of them but there is a problem. I tried to make mosaic with Mosaic colormap Mode - FIRST, but still parts with different colourmap stay the same after mosaicing. Images are in .gif and .png formats, number of bands is 1, 8 bit, unsigned integer. I need them to be the same so I can extract only contours. I already tried converting to same image formats but no luck. I'm using ArcMap 10.1

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