How to manipulate color pixel image? Example: Set all blue pixels in an image to yellow.
Well its too long to explain here, I suggest you check videos related to it.
Hello @james.brownn732. Any specific tutorials?
There is a lot of interesting stuff around here. 
@denilso100 Do you still have issues with this?
Hi @denilso100,
If you are looking for just some code to achieve that, then its different, but if you are wanting to learn about the same, then you need to look up CoreImage. It has some powerful functions to manipulate images. There is a book in iBooks by an Apple engineer on this very topic.
cheers,
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