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

[bsmile <forums gimpusers com>]

> 1) Image>Autocrop image, once you have fixed 2) on the two layers.
>
> 2) You white background is not uniform it contains pixels with 253 
> instead of 255,
>
> http://imgur.com/zHn0KH9
>
> ... and autocrop only works with completely uniform backgrounds. You
> can
> fix this with "Levels", dragging the right hand of "Input" towards
> value
> 250 (or anything left of the line at value 253 in the histogram).


Thanks for the explanation, but please be more specific where to locate the
option of value to be revised?

I right clicked my mouse to bring up colors->levels->input levels, output level,
I changed the value to 250, and then ok, then layer->autocrop layer, but no
difference, I right click my mouse again to input levels, it is still 255, like
never been modified before.

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