7.1.155. 3dThreetoRGBΒΆ

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Usage #1: 3dThreetoRGB [options] dataset Usage #2: 3dThreetoRGB [options] dataset1 dataset2 dataset3

Converts 3 sub-bricks of input to an RGB-valued dataset. * If you have 1 input dataset, then sub-bricks [0..2] are

used to form the RGB components of the output.
  • If you have 3 input datasets, then the [0] sub-brick of

    each is used to form the RGB components, respectively.

  • RGB datasets have 3 bytes per voxel, with values ranging

    from 0..255.

Options:

-prefix ppp = Write output into dataset with prefix ‘ppp’.
[default=’rgb’]
-scale fac = Multiply input values by ‘fac’ before using
as RGB [default=1]. If you have floating point inputs in range 0..1, then using ‘-scale 255’ would make a lot of sense.
-mask mset = Only output nonzero values where the mask
dataset ‘mset’ is nonzero.
-fim = Write result as a ‘fim’ type dataset.
[this is the default]
-anat = Write result as a anatomical type dataset.

Notes: * Input datasets must be byte-, short-, or float-valued. * You might calculate the component datasets using 3dcalc. * You can also create RGB-valued datasets in to3d, using

2D raw PPM image files as input, or the 3Dr: format.
  • RGB fim overlays are transparent in AFNI in voxels where all

    3 bytes are zero - that is, it won’t overlay solid black.

  • At present, there is limited support for RGB datasets.

    About the only thing you can do is display them in 2D slice windows in AFNI.

– RWCox - April 2002

++ Compile date = Dec 16 2015

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