Renderer: set settings

[jburel]

See ticket 621 on shoola trac. I found a workaround, but the method set the model to "rgb" and should be set to "hsb" in order to fix the problem described in ticket 621. See this probably linked to the fact that we no longer have a HSB strategy but we still "hsb" as the default model i.e. the first time the image is launched the

renderer.getModel()  is hsb