Hey Arno,
It calculates the screen color and pick the most common color of the list. So if the calculated color is orange but in the list is only red, green, blue, it will pick red. Means: If you remove white from the list it will chose one of the other most common colors.
So you cannot “change” a color.
Please keep in mind: It is definitly something for experimenting. I´m not sure if this tool will work in any cases.
For the problem with high resulutions also take a look at this post:
For my application I will take a look into it as soon as possible. But regarding BlinkStick Client it is part of the developer himself. Can´t say anything about the progress.