Feature Request: Mask painting precision assistance

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Problem:

Currently, when mask is set to true, we have a blank canvas added to the right side of the input (or preview) image.

We then paint the areas we wish to mask, these masked areas are applied to the input image using the selected controlnet.

One issue with this is that it can be quite difficult to work out whether we are precisely masking the areas of the input image as intended, we have to kind of roughly judge, and if the desired masking area is small or needs to be precise this can be quite difficult.

Proposed solution:

It would be very helpful if one of the following could be implemented:

Either

a) Drawing a mask area in the mask image window also draws the painted mask area, @ low/medium opacity over the input image to the left.

or (preferable)

b) The input image can be shown/overlaid (with a toggle) in the mask image window, @ low/medium opacity, and be painted over, without this overlaid image interfering with or influencing the generated mask.

Empieza localizando el código de UI de la imagen de entrada o de vista previa y de la ventana de la imagen de máscara; después, rastrea cómo se aplican las áreas de máscara pintadas mediante el ControlNet seleccionado. Compara los dos enfoques de overlay propuestos y define un overlay de entrada activable, con opacidad baja o media, que no altere la máscara generada; se considera terminado cuando la alineación precisa sea visible y el enmascarado siga comportándose sin cambios.

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