convert a tracks file into a map of the fraction of tracks to enter each voxel.
| -template image | an image file to be used as a template for the output (the output image wil have the same transform and field of view). 
| image | the input template image |  | 
| -vox size | provide either an isotropic voxel size, or comma-separated list of 3 voxel dimensions. 
| size | the voxel size (in mm). |  | 
| -colour | add colour to the output image according to the direction of the tracks. | 
| -fraction | produce an image of the fraction of fibres through each voxel (as a proportion of the total number in the file), rather than the count. | 
| -totalcount | when using the -fraction option, compute fractions as proportion of total_count header entry rather than number of tracks in the file. This total_count corresponds to the total number of streamlines actually generated rather than those that were eventually selected. | 
| -lstdi | scale the contribution of each track to the density image by the inverse of the streamline length | 
| -datatype spec | specify output image data type. 
| spec | the data type specifier. |  | 
| -resample factor | resample the tracks at regular intervals using Hermite interpolation. If omitted, the program will select an appropriate interpolation factor automatically. 
| factor | the factor by which to resample. |  | 
| -info | display information messages. | 
| -quiet | do not display information messages or progress status. | 
| -debug | display debugging messages. | 
| -help | display this information page and exit. | 
| -version | display version information and exit. |