Some of this SORT OF exists in iOS Photos, but I was wondering if there is an iPhone photo editing app that does the following:
Create a copy of an image.
Allows one to choose a white point and a black point.
Can break an image into its primary color layers either
an RGB model or
CMYK model,
that would allow for discarding any of those layers.
That’s it. That is all I want or need from it.
Is there an iPhone photo editing app with these features?