each_channel decorator

[Tony Yu]

On Tue, Oct 16, 2012 at 7:59 PM, Steven Silvester <
steven.silvester at gmail.com> wrote:

> I would suggest the following instead:
> Convert to LAB
> Perform transform on lightness channel
> Convert back to RGB
>
> Because, red, green, and blue are not really independent "channels" to the
> human eye.  I used this method on the adapthist pull request when handling
> RGB images.
>

I was originally thinking the same as Stéfan (i.e. operating on each RGB
channel and re-assembling), but I like the idea of operating on the
lightness channel.

(Sorry your adapthist PR has sat unreviewed for so long)

-Tony
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