固定图片取色
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { //触点对象 UITouch *touch=touches.anyObject; //触点位置 CGPoint touchLocation=[touch locationInView:self.colorImage]; // self.pointImg.frame = CGRectMake(self.colorImage.frame.origin.x + touchLocation.x,self.colorImage.frame.origin.y + touchLocation.y, 5, 5); self.pointImg.center = CGPointMake(self.colorImage.frame.origin.x + touchLocation.x, self.colorImage.frame.origin.y + touchLocation.y); NSLog(@"%f %f",touchLocation.x,touchLocation.y); //触点颜色 UIColor *positionColor=[self getPixelColorAtLocation:touchLocation]; NSLog(@"====%@",positionColor); self.colorView.backgroundColor = positionColor; } - (UIColor*) getPixelColorAtLocation:(CGPoint)point { UIColor* color = [UIColor whiteColor]; if (point.x < self.colorImage.frame.size.width && point.x > 0 && point.y < self.colorImage.frame.size.height && point.y > 0) { UIImageView *colorImageView=self.colorImage; CGImageRef inImage = colorImageView.image.CGImage; // Create off screen bitmap context to draw the image into. Format ARGB is 4 bytes for each pixel: Alpa, Red, Green, Blue CGContextRef cgctx = [self createARGBBitmapContextFromImage:inImage]; if (cgctx == NULL) { return nil; } size_t w = CGImageGetWidth(inImage); size_t h = CGImageGetHeight(inImage); CGRect rect = {{0,0},{w,h}}; // Draw the image to the bitmap context. Once we draw, the memory // allocated for the context for rendering will then contain the // raw image data in the specified color space. CGContextDrawImage(cgctx, rect, inImage); // Now we can get a pointer to the image data associated with the bitmap // context. unsigned char* data = CGBitmapContextGetData (cgctx); if (data != NULL) { //offset locates the pixel in the data from x,y. //4 for 4 bytes of data per pixel, w is width of one row of data. @try { // int offset = 4*((w*round(point.y * self.scale))+round(point.x * self.scale)); int offset = 4*((w*round(point.y ))+round(point.x)); //NSLog(@"offset: %d", offset); int alpha = data[offset]; int red = data[offset+1]; int green = data[offset+2]; int blue = data[offset+3]; NSLog(@"offset: %i colors: RGB A %i %i %i %i",offset,red,green,blue,alpha); color = [UIColor colorWithRed:(red/255.0f) green:(green/255.0f) blue:(blue/255.0f) alpha:(alpha/255.0f)]; } @catch (NSException * e) { NSLog(@"%@",[e reason]); } @finally { } } // When finished, release the context CGContextRelease(cgctx); // Free image data memory for the context if (data) { free(data); } } return color; } - (CGContextRef) createARGBBitmapContextFromImage:(CGImageRef) inImage { CGContextRef context = NULL; CGColorSpaceRef colorSpace; void * bitmapData; int bitmapByteCount; int bitmapBytesPerRow; // Get image width, height. We'll use the entire image. size_t pixelsWide = CGImageGetWidth(inImage); size_t pixelsHigh = CGImageGetHeight(inImage); // Declare the number of bytes per row. Each pixel in the bitmap in this // example is represented by 4 bytes; 8 bits each of red, green, blue, and // alpha. bitmapBytesPerRow = (int)(pixelsWide * 4); bitmapByteCount =(int)(bitmapBytesPerRow * pixelsHigh); // Use the generic RGB color space. colorSpace = CGColorSpaceCreateDeviceRGB(); if (colorSpace == NULL) { fprintf(stderr, "Error allocating color space\n"); return NULL; } // Allocate memory for image data. This is the destination in memory // where any drawing to the bitmap context will be rendered. bitmapData = malloc( bitmapByteCount ); if (bitmapData == NULL) { fprintf (stderr, "Memory not allocated!"); CGColorSpaceRelease( colorSpace ); return NULL; } // Create the bitmap context. We want pre-multiplied ARGB, 8-bits // per component. Regardless of what the source image format is // (CMYK, Grayscale, and so on) it will be converted over to the format // specified here by CGBitmapContextCreate. context = CGBitmapContextCreate (bitmapData, pixelsWide, pixelsHigh, 8, // bits per component bitmapBytesPerRow, colorSpace, kCGImageAlphaPremultipliedFirst); if (context == NULL) { free (bitmapData); fprintf (stderr, "Context not created!"); } // Make sure and release colorspace before returning CGColorSpaceRelease( colorSpace ); return context; } 自定义图片取色
@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate> @property(nonatomic,strong)UIImageView *imageView; @property(nonatomic,strong)UIImageView *backgroundImageV; @property (weak, nonatomic) IBOutlet UIView *colorView; @property(nonatomic,assign)CGFloat scale; @property(nonatomic,strong)UIView *viewCircle; @property (nonatomic,assign)NSInteger openType; @property (nonatomic,strong)UIPopoverController *imagePickerPopover; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a } - (IBAction)getImageAction:(id)sender { UIImagePickerController *picker = [[UIImagePickerController alloc] init]; [self.navigationController presentViewController:picker animated:YES completion:nil]; picker.delegate = self; } //计算imageView的frame -(CGRect)getImageByScaleFromImage:(UIImage *)image { CGFloat widthScale = image.size.width / SCREEN_WIDTH; CGFloat heightScale = image.size.height / SCREEN_HEIGHT; self.scale = MAX(widthScale, heightScale); return CGRectMake(0, (SCREEN_HEIGHT - (image.size.height - 64) / self.scale) / 2.0, image.size.width / self.scale, image.size.height / self.scale); } //修正图片的旋转方向 - (UIImage *)fixOrientation:(UIImage *)aImage { if (aImage.imageOrientation == UIImageOrientationUp) return aImage; CGAffineTransform transform = CGAffineTransformIdentity; switch (aImage.imageOrientation) { case UIImageOrientationDown: case UIImageOrientationDownMirrored: transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height); transform = CGAffineTransformRotate(transform, M_PI); break; case UIImageOrientationLeft: case UIImageOrientationLeftMirrored: transform = CGAffineTransformTranslate(transform, aImage.size.width, 0); transform = CGAffineTransformRotate(transform, M_PI_2); break; case UIImageOrientationRight: case UIImageOrientationRightMirrored: transform = CGAffineTransformTranslate(transform, 0, aImage.size.height); transform = CGAffineTransformRotate(transform, -M_PI_2); break; default: break; } switch (aImage.imageOrientation) { case UIImageOrientationUpMirrored: case UIImageOrientationDownMirrored: transform = CGAffineTransformTranslate(transform, aImage.size.width, 0); transform = CGAffineTransformScale(transform, -1, 1); break; case UIImageOrientationLeftMirrored: case UIImageOrientationRightMirrored: transform = CGAffineTransformTranslate(transform, aImage.size.height, 0); transform = CGAffineTransformScale(transform, -1, 1); break; default: break; } // Now we draw the underlying CGImage into a new context, applying the transform // calculated above. CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height, CGImageGetBitsPerComponent(aImage.CGImage), 0, CGImageGetColorSpace(aImage.CGImage), CGImageGetBitmapInfo(aImage.CGImage)); CGContextConcatCTM(ctx, transform); switch (aImage.imageOrientation) { case UIImageOrientationLeft: case UIImageOrientationLeftMirrored: case UIImageOrientationRight: case UIImageOrientationRightMirrored: // Grr... CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage); break; default: CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage); break; } // And now we just create a new UIImage from the drawing context CGImageRef cgimg = CGBitmapContextCreateImage(ctx); UIImage *img = [UIImage imageWithCGImage:cgimg]; CGContextRelease(ctx); CGImageRelease(cgimg); return img; } -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { UIImage *firstImage = [info valueForKey:UIImagePickerControllerOriginalImage]; UIImage *image = [self fixOrientation:firstImage]; NSLog(@"123 %f %f",image.size.width,image.size.height); //将照片放入UIImageView对象中； self.imageView=[[UIImageView alloc]init]; self.imageView.frame=[self getImageByScaleFromImage:image]; self.imageView.image = image; self.backgroundImageV = [[UIImageView alloc]initWithFrame:CGRectMake(0, self.imageView.frame.origin.y, image.size.width, image.size.height)]; self.backgroundImageV.image = image; UIView *coverView = [[UIView alloc]initWithFrame:self.backgroundImageV.frame]; coverView.backgroundColor = [UIColor whiteColor]; [self.view addSubview:self.backgroundImageV]; [self.view addSubview:coverView]; [self.view addSubview:self.imageView]; // self.imageView=imageView; UIView *viewCircle=[[UIView alloc]init]; viewCircle.backgroundColor=[UIColor clearColor]; viewCircle.layer.borderColor=[[UIColor blackColor]CGColor]; viewCircle.layer.borderWidth=1.5; viewCircle.frame=CGRectMake(0,64, 25, 25); [viewCircle.layer setCornerRadius:CGRectGetHeight([viewCircle bounds]) / 2]; viewCircle.layer.masksToBounds=YES; self.viewCircle=viewCircle; [self.imageView addSubview:self.viewCircle]; if (self.openType == UIImagePickerControllerSourceTypeCamera) { //将图片保存到图库 UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL); }else if(self.openType == UIImagePickerControllerSourceTypePhotoLibrary){ //本身是从图库打开的，就不用保存到图库了； } //判断UIPopoverController对象是否存在 if (self.imagePickerPopover) { [self.imagePickerPopover dismissPopoverAnimated:YES]; self.imagePickerPopover = nil; } else { //关闭以模态形式显示的UIImagePickerController [self dismissViewControllerAnimated:YES completion:nil]; } } -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { //触点对象 UITouch *touch=touches.anyObject; //触点位置 CGPoint touchLocation=[touch locationInView:self.imageView]; NSLog(@"%f %f",touchLocation.x,touchLocation.y); //触点颜色 UIColor *positionColor=[self getPixelColorAtLocation:touchLocation]; NSLog(@"====%@",positionColor); self.colorView.backgroundColor = positionColor; } // - (UIColor*) getPixelColorAtLocation:(CGPoint)point { UIColor* color = [UIColor whiteColor]; if (point.x < self.imageView.frame.size.width && point.x > 0 && point.y < self.imageView.frame.size.height && point.y > 0) { UIImageView *colorImageView=self.backgroundImageV; CGImageRef inImage = colorImageView.image.CGImage; // Create off screen bitmap context to draw the image into. Format ARGB is 4 bytes for each pixel: Alpa, Red, Green, Blue CGContextRef cgctx = [self createARGBBitmapContextFromImage:inImage]; if (cgctx == NULL) { return nil; } size_t w = CGImageGetWidth(inImage); size_t h = CGImageGetHeight(inImage); CGRect rect = {{0,0},{w,h}}; // Draw the image to the bitmap context. Once we draw, the memory // allocated for the context for rendering will then contain the // raw image data in the specified color space. CGContextDrawImage(cgctx, rect, inImage); // Now we can get a pointer to the image data associated with the bitmap // context. unsigned char* data = CGBitmapContextGetData (cgctx); if (data != NULL) { //offset locates the pixel in the data from x,y. //4 for 4 bytes of data per pixel, w is width of one row of data. @try { int offset = 4*((w*round(point.y * self.scale))+round(point.x * self.scale)); //NSLog(@"offset: %d", offset); int alpha = data[offset]; int red = data[offset+1]; int green = data[offset+2]; int blue = data[offset+3]; // NSLog(@"offset: %i colors: RGB A %i %i %i %i",offset,red,green,blue,alpha); color = [UIColor colorWithRed:(red/255.0f) green:(green/255.0f) blue:(blue/255.0f) alpha:(alpha/255.0f)]; } @catch (NSException * e) { NSLog(@"%@",[e reason]); } @finally { } } // When finished, release the context CGContextRelease(cgctx); // Free image data memory for the context if (data) { free(data); } } return color; } - (CGContextRef) createARGBBitmapContextFromImage:(CGImageRef) inImage { CGContextRef context = NULL; CGColorSpaceRef colorSpace; void * bitmapData; int bitmapByteCount; int bitmapBytesPerRow; // Get image width, height. We'll use the entire image. size_t pixelsWide = CGImageGetWidth(inImage); size_t pixelsHigh = CGImageGetHeight(inImage); // Declare the number of bytes per row. Each pixel in the bitmap in this // example is represented by 4 bytes; 8 bits each of red, green, blue, and // alpha. bitmapBytesPerRow = (int)(pixelsWide * 4); bitmapByteCount =(int)(bitmapBytesPerRow * pixelsHigh); // Use the generic RGB color space. colorSpace = CGColorSpaceCreateDeviceRGB(); if (colorSpace == NULL) { fprintf(stderr, "Error allocating color space\n"); return NULL; } // Allocate memory for image data. This is the destination in memory // where any drawing to the bitmap context will be rendered. bitmapData = malloc( bitmapByteCount ); if (bitmapData == NULL) { fprintf (stderr, "Memory not allocated!"); CGColorSpaceRelease( colorSpace ); return NULL; } // Create the bitmap context. We want pre-multiplied ARGB, 8-bits // per component. Regardless of what the source image format is // (CMYK, Grayscale, and so on) it will be converted over to the format // specified here by CGBitmapContextCreate. context = CGBitmapContextCreate (bitmapData, pixelsWide, pixelsHigh, 8, // bits per component bitmapBytesPerRow, colorSpace, kCGImageAlphaPremultipliedFirst); if (context == NULL) { free (bitmapData); fprintf (stderr, "Context not created!"); } // Make sure and release colorspace before returning CGColorSpaceRelease( colorSpace ); return context; }
