macOS Accessing Pixel Data in a CIImage

[cblackburn]

Hey everyone,

I have a program that manipulates some images using Core Image but now I need to access data about individual pixels from the image. What is the best way to do this? Do I need to pull the image down from the GPU? If so then how do I do that?

Thanks

Chris

 

[kainjow]

I don't think you can modify the CIImage directly. However check out this post: http://gigliwood.com/weblog/Cocoa/Core_Image__Practic.html

 

[cblackburn]

Trouble is that will convert it to an NSImage but when I try to get an NSBitmapImageRep from it to read individual pixel data it crashes saying it cannot do that.

I only want to read the data at certain pixels, I don't need to change it.

Chris