how ColorOutput works?

*To*: mathgroup at smc.vnet.net*Subject*: [mg22194] how ColorOutput works?*From*: Nicola Attico <attico at peg2.difi.unipi.it>*Date*: Thu, 17 Feb 2000 01:24:31 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Hello, I've a problem with color specifications in Plot. I take a simple example to explain. Let consider: In[1]:=Plot3D[ x^2+y^2 ,{x,0,1} ,{y,0,1}, ColorOutput-> RGBColor] This works fine. If I try (as I need): In[1]:=Plot3D[ x^2+y^2 ,{x,0,1} ,{y,0,1}, ColorOutput-> None] this gives the error message: ColorOutput::colpc: Result None[GrayLevel[0.]] obtained during color conversion by applying function None to color GrayLevel[0] is not a GrayLevel, RGBColor, or CMYKColor color directive. What does it means? How can I avoid this problem? Thanks, Nicola (Please, if possible reply also by an email message to my address.) ---------------- Nicola Attico Dip. Fisica - Pzza Torricelli, 2 - Pisa E-Mail: attico at peg2.difi.unipi.it © 2000 by Nicola Attico, all right reserved