De-Skew and Auto De-Skew: Supported colour modes?

[helmut]

Is there are reason why the supported colour modes of "De-skew" and "Auto De-Skew" differ?

Edit:
De-Skew is available for following colour modes:
- Grayscale (256 bpp)
- b/w images (1 bpp)

Auto-De-Skew is available for all colour modes

[xnview]

Yes, i don't use the same code

[helmut]

Yes, i don't use the same code

Ah, o.k.. Any chance for unifying this? Ideally both de-skewing function are applicable in all colour modes.