v.tan v.tan calculates the tangent of the brightness of each pixel in the image v.tan calculates the tangent of the brightness of each pixel in the image (output as grays float32) This is quite an accurate calculation and it not as fast as most simple math softVNS 2 processes.	from the library : softVNS Format : External Environment : jitter / max commercial Max 4.x http://homepage.mac.com/davidrokeby/softVNS.html