Boulder Laboratory for 3-Dimensional Electron Microscopy of Cells TAPERVOLEDGE(1) TAPERVOLEDGE(1) NAME tapervoledge - to excise a subset of a volume, taper the edges, and pad SYNOPSIS tapervoledge DESCRIPTION This program will cut a subset out of an image volume, taper the intensity down to the mean value at the edge of the volume over a specified range of pixels, and embed this subset into a larger volume with specified borders. The resulting volume will have dimensions suitable for taking the FFT. As a special case, a single X/Y plane may be excised and tapered at its edges. Inputs to the program: Name of input file Name of output file Dimensions of the block to cut out, in X, Y and Z. The default is the whole volume. The index coordinates (ix, iy, iz) of the center of the block. The default is the center of the input volume. The width of the borders, in X, Y, and Z, with which to pad the image block. Borders will be made larger as necessary to make the output image size suitable for taking an FFT. If the dimension being excised in Z is 1, then padding must be zero in Z. The extent in X, Y, and Z over which to taper the image intensity down to the mean at the edge. For example, if an extent of 3 is used for the X direction, the last three pixels on a line would be attenuated toward the mean value by 1/4, 1/2, and 3/4. The program will stop with an error message if the subset or the output image is too large, or if the subset is not entirely within the input volume. HISTORY Written by David Mastronarde 7/22/97; 2/2/01: taper a single slice.