The option you are looking for is ColorFunction
. When you create a colorcolour function manually using the GUI, you can press the Copy Function button at the bottom. Paste the function into the notebook, and store it in a variable named cfun
. Then use Image3D[yourDataOrYourImage, ColorFunction -> cfun]
.
Be sure to look up the ColorFunction
option within the Image3D
documentation page. There are many examples, including a number of pre-set named colour functions that are not available in 2D.