[Gimp-user] why autocrop layer would not cut all the blanks?

[bsmile <forums gimpusers com>]

> If you use Windows>Dockable dialogs>Histogram the right of the
> histogram
> has two vertical lines, which indicate that that you have pixels with 
> value 253 as well as pixels with value 255. You should also see these 
> two lines in the histogram shown in the Levels tool. In Levels, if you
> drag the right handle of the input (top bar) to the left of the two 
> lines (around 250), then everything bigger that the indicated value 
> becomes pure white, so this should change your pixels with value 253
> to
> pure white.

Thanks for your explanation. It seems I hadn't reduce the upper level low
enough. This time I reduce it to 230 and it works as expected.

-- 
bsmile (via www.gimpusers.com/forums)