IOS gets the color object (UIColor *) of an image *).

-(UIColor *) colorAtPixel :( CGPoint) point {

// Cancel if point is outside image coordinates

If (! CGRectContainsPoint (CGRectMake (0.0f, 0.0f, self. size. width, self. size. height), point )){

Return nil;

}

NSInteger pointX = trunc (point. x );

NSInteger pointY = trunc (point. y );

CGImageRef cgImage = self. CGImage;

NSUInteger width = self. size. width;

NSUInteger height = self. size. height;

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB ();

Int bytesPerPixel = 4;

Int bytesPerRow = bytesPerPixel * 1;

NSUInteger bitsPerComponent = 8;

Unsigned char pixelData [4] = {0, 0, 0 };

CGContextRef context = CGBitmapContextCreate (pixelData,

1,

1,

BitsPerComponent,

BytesPerRow,

ColorSpace,

KCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big );

Cgcolorspacerelstrap (colorSpace );

CGContextSetBlendMode (context, kCGBlendModeCopy );

// Draw the pixel we are interested in onto the bitmap context

CGContextTranslateCTM (context,-pointX, pointY-(CGFloat) height );

CGContextDrawImage (context, CGRectMake (0.0f, 0.0f, (CGFloat) width, (CGFloat) height), cgImage );

CGContextRelease (context );

// Convert color values [0 .. 255] to floats [0. 0 .. 1.0]

CGFloat red = (CGFloat) pixelData [0]/255.0f;

CGFloat green = (CGFloat) pixelData [1]/255.0f;

CGFloat blue = (CGFloat) pixelData [2]/255.0f;

CGFloat alpha = (CGFloat) pixelData [3]/255.0f;

Return [uicolorwithred: red green: greenblue: blue alpha: alpha];

}

UIImage+ColorAtPixel.h #import 
 
  /* A category on UIImage that enables you to query the color value of arbitrary  pixels of the image. */@interface UIImage (ColorAtPixel)- (UIColor *)colorAtPixel:(CGPoint)point;@end#import 
  
   #import "UIImage+ColorAtPixel.h"@implementation UIImage (ColorAtPixel)- (UIColor *)colorAtPixel:(CGPoint)point {    // Cancel if point is outside image coordinates    if (!CGRectContainsPoint(CGRectMake(0.0f, 0.0f, self.size.width, self.size.height), point)) {        return nil;    }    NSInteger pointX = trunc(point.x);    NSInteger pointY = trunc(point.y);    CGImageRef cgImage = self.CGImage;    NSUInteger width = self.size.width;    NSUInteger height = self.size.height;    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();    int bytesPerPixel = 4;    int bytesPerRow = bytesPerPixel * 1;    NSUInteger bitsPerComponent = 8;    unsigned char pixelData[4] = { 0, 0, 0, 0 };    CGContextRef context = CGBitmapContextCreate(pixelData,                                                  1,                                                 1,                                                 bitsPerComponent,                                                  bytesPerRow,                                                  colorSpace,                                                 kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);    CGColorSpaceRelease(colorSpace);    CGContextSetBlendMode(context, kCGBlendModeCopy);    // Draw the pixel we are interested in onto the bitmap context    CGContextTranslateCTM(context, -pointX, pointY-(CGFloat)height);    CGContextDrawImage(context, CGRectMake(0.0f, 0.0f, (CGFloat)width, (CGFloat)height), cgImage);    CGContextRelease(context);        // Convert color values [0..255] to floats [0.0..1.0]    CGFloat red   = (CGFloat)pixelData[0] / 255.0f;    CGFloat green = (CGFloat)pixelData[1] / 255.0f;    CGFloat blue  = (CGFloat)pixelData[2] / 255.0f;    CGFloat alpha = (CGFloat)pixelData[3] / 255.0f;    return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];}@end