* Update examples inconsistencies

* Happy new years, examples!

* Missed one inconsistency

* Update final few examples inconsistencies

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Co-authored-by: Anstro Pleuton <anstropleuton@github.com>

* created ImageFromChannel

Adds the possibility to extract a specific channel from an image

* naming convention

* example window height

* removed threshold

* removed alpha channel

* channel example organization

* updated channel example image