Re: Can't seem to get -level to work

On Sat, 16 Apr 2016, Toby Thain wrote:

> Hi,
>
> I don't seem to understand the parameters of -level, or there is a bug?
>
> I want to adjust the black and white points by about 10%.
>
> Please see this image for the input and output of the parameters I'm
> trying (I've also tried percentages, floating point, exchanging the
> values, all to no avail):

The documentation says that the syntax is

   -level <black_point>{,<gamma>}{,<white_point>}{%}

so

   gm mogrify -level '10,1.0,90%' gradient-mod.tif

should do what you want.

This usage seems to be based on a Photoshop dialog.

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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