cgimage

while working with OpenCV I need to convert a NSImage to an OpenCV multi-channel 2D matrix (cvMat) and vice versa. What's the best way to do it? Greets, Dom dom Here's my outcome, which works pretty well. NSImage+OpenCV.h: // // NSImage+OpenCV.h // #import <AppKit/AppKit.h> @interface NSImage (NSImage_OpenCV) { } +(NSImage*)imageWithCVMat:(const cv::Mat&)cvMat; -(id)initWithCVMat:(const cv::Mat&)cvMat; @property(nonatomic, readonly) cv::Mat CVMat; @property(nonatomic, readonly) cv::Mat CVGrayscaleMat; @end NSImage+OpenCV.mm: // // NSImage+OpenCV.mm // #import "NSImage+OpenCV.h" static void

In my application I need to resize and crop some images, stored locally and online. I am using Trevor Harmon's tutorial which implements UIImage+Resize . On my iPhone 4(iOS 4.3.1) everything works OK, I have no problems. But on my iPhone 3G (iOS 3.2) the resizing and crop methods are not working for any picture (the locally stored ones are PNGs). This is the console output: Tue Apr 5 02:34:44 Andreis-MacBook-Pro.local Puzzle[12453] <Error>: CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 32 bits/pixel; 3-component color space; kCGImageAlphaLast; 288 bytes

I have an app so far that allows the user to free draw (like a sketch pad) on a UIImageView element. I want to get the raw RGB pixel data (as 0 to 255 integer values) as a multidimensional array so I can feed it into a machine learning algorithm . Or is there some other way I can send the raw image data over to separate C++ function? Is there an easy way to do this in Swift? Converting a CGImage to an array of intensity values My function takes a CGImage and returns an array of unsigned 8-bit integers as well as the width and height of the image. I wrote this code for use with grayscale images