Trying to paint the night textures to the aircraft. Say with the xxx_LLon_LM.bmp format I have created a layer with multiply properties and then using the lights effect I have created the light or the projector to the side of the fuselage. When decreased the colour depth to 256 colours (8 bit) I do not get a smooth transition of colours, instead I get lines. See picture below. Could anyone tell me how to create smooth light effect.( When the layer is transferred to greyscale the transmission is ok but when incorporated with the other layers it doesn'work either)

This is what I do. When reducing the color depth to 256 change the pallette to optimised tree and Reduction Method to Error diffusion on the pop up window. This will create a smooth effect for the lights.

Thanks it worked well. Letats