Mask a label using an image file mask

In the Stencil texture Control Window, click the Map button beside the Mask parameter. The Texture Procedures window appears.
In the Texture Procedures window, click the File button. The Texture Procedures window automatically closes, a File texture swatch appears in the Multi-lister, and the Control Window displays the texture’s parameters.
In the Control Window, type the name of the image file you want to use as the mask in the Mask field, or click the Browse button and select the mask file using the File Requestor.
The Mask is now mapped onto the shader, and the Image file no longer covers the entire shader swatch in the Multi-lister. The Mask file is in the same location as the Image file.

To control the overall transparency of the Stencil texture, adjust the Rgbmult value in the Mask file’s Control Window.

To control the softness of the mask, adjust the Bluroffset value in the Mask file’s Control Window. Small values (around 0.01) are most useful.