Stefan Röttger

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The transfer functions used for direct volume rendering consist of two parts, which define the absorption resp. the emission of an assumed “cloud”-volume.

That is, for the display of a volume we need two transfer functions, one for the transparency ($TF_A$), and one for the color ($TF_{RGB}$):

In the examples above $TF_A$ is shown as the white top curve and $TF_{RGB}$ is shown as colored bottom curve. Both are displayed with the histogram as background.

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