GrowImage RGB tone is being applied over current image

[eduardobeloni]

This happens when I set the AnalogTone.Tone property of a group (which is in fact a single image turned into a group) with a few instances and different colours.

When running the rt_xtt (operator) on that graph, I notice that the colours do change according to the analog signal, but the new colour is applied over the already changed set of pixels of that image instead of being applied over the original image. In this case I think the new colour should always be set based on the original image.

I'm using the AnalogTone property to paint an image because the geref doc states to use the tone.