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

[Ofnuts <ofnuts gmx com>]

On 15/03/17 19:53, bsmile wrote:
> Three questions,
>
>
> (1) can I group the layers together and then request autocrop? right now, I seem
> to have to merge layers to be one to request autocrop. But that prevents me from
> the ability to do changes as needed.
>
>
> (2) After I merge to just a single layer, it seems autocrop can crop the upper
> and bottom whites well, but not the left and right white, do you see the same
> thing or any wrong I did?
>
>
> (3) It seems gimp does not provide convenient tools like arrow etc, so I
> basically copy/paste the arrows from powerpoint here, the issue is, it seems the
> color cannot be copied. Is there way to deal with that?
>
>
> Still a quite newbie, thanks for your kind help!
>
> Attachments:
> * http://www.gimpusers.com/system/attachments/515/original/fermisurface_a.xcf
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).