You can use use color_correct with alpha_is_luminance enabled, like this:
![](https://arnoldsupport.com/wp-content/uploads/2019/01/triplanar_bump.jpg")
Using triplanar as a bump map
Arnold Support Corner
Tips, tricks, and troubleshooting help from Steve "xsisupport" Blair
You can use use color_correct with alpha_is_luminance enabled, like this:
Arnold Support Corner 