Converts an image to raw pgm format. Results go to stdout and should be redirected. Usage: mritopgm [-pp] input_image Example: mritopgm fred.001 | ppmtogif > fred.001.gif
The ‘-pp’ option expresses a clipping percentage. That is, if this option is given, the pp%-brightest pixel is mapped to white; all above it are also white, and all below are mapped linearly down to black. The default is that pp=100; that is, the brightest pixel is white. A useful operation for many MR images is
mritopgm -99 fred.001 | ppmtogif > fred.001.gifThis will clip off the top 1% of voxels, which are often super-bright due to arterial inflow effects, etc.
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