in <MPG### [at] NEWSPOVRAYORG> Sander wrote:

>What causes the change in colour and why does 
>the +R image look so flat? 
>Settings: 
 <snip code>
>Just a low-quality R to start with.
>Is it the assumed_gamma? or the ambient_light?

 The use of ambient_light makes the scene look flat as it brightens it. 
You can probably delete it when using radiosity.
 Also have a look at the diffuse values in the finish of your textures, 
it determines the basic brightnes of a texture when using radiosity. 

 You use an assumed_gamma of 2.2, together with the preset 
display_gamma of 2.2 this results in an image with a gamma of 1. A 
gamma 1 picture will look somewhat dark on a gamma 2.2 monitor.  It may 
be that you compensated this by using stronger lights (value bigger 
than 1) and the ambient_light.
 When you set the assumed_gamma to 1, the image will have a gamma of 
2.2. This will look more natural on your monitor. You may have to 
reduce light intensities. 


Ingo

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