macOS scan an image (partial) for color?

[DennisBlah]

Hi all,

I was just wandering if this is possible to do in cocoa.
My target is, make screenshot of the current screen of an iphone or ipad.
Then with a partial colorpicker of the screenshot I want to determine if the device in is the welcome screen or not.

Is there anyone that can help me out with the color picking part ?
If this is possible.. ofcourse.


EDIT: This applies for a mac application, and not an iOS application.

My mac application can make screenshots of an iPhone.
The Mac must scan/colopick background color of these screenshots.

Thanks!


Sollution:
Down here the following code I used in an test environment, with 2 input fields so I can give an NSPoint.
The NSPoint is from bottom left, so I take image height - desired height.
This will get hex color code from image from x,y from topleft.

NSImage *image = [NSImage imageNamed:@"colorTest.png"];
    
    NSLog(@"%f",image.size.width);
    NSLog(@"%f",image.size.height);

    NSPoint aPoint = NSMakePoint([posX.stringValue intValue] , (int)image.size.height - [posY.stringValue intValue]);
    
    [image lockFocus];
    NSColor *aColor = NSReadPixel(aPoint);
    [image unlockFocus];

NSString* hexString = [NSString stringWithFormat:@"%02X%02X%02X",
                           (int) (aColor.redComponent * 0xFF), (int) (aColor.greenComponent * 0xFF),
                           (int) (aColor.blueComponent * 0xFF)];