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PORGB in image processing in iphone app
 

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  1. PORGB in image processing in iphone app
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    <p>I am doing an image processing in mp app. I got the pixel color from image and apply this on image by touching.. My code get the pixel color but it changes the whole image in blue color and apply that blue in image processing. I am stuck in code. But don't know what is going wrong in my code.May you please help me. </p> <p>My code is:</p> <pre><code>-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint coordinateTouch = [touch locationInView:[self view]];//where image was tapped if (value == YES) { self.lastColor = [self getPixelColorAtLocation:coordinateTouch]; value =NO; } NSLog(@"color %@",lastColor); //[pickedColorDelegate pickedColor:(UIColor*)self.lastColor]; ListPoint point; point.x = coordinateTouch.x; point.y = coordinateTouch.y; button = [UIButton buttonWithType:UIButtonTypeCustom]; button.backgroundColor = [UIColor whiteColor]; button.frame = CGRectMake(coordinateTouch.x-5, coordinateTouch.y-5, 2, 2); //[descImageView addSubview:button]; [bgImage addSubview:button]; // Make image blurred on ImageView if(bgImage.image) { CGImageRef imgRef = [[bgImage image] CGImage]; CFDataRef dataRef = CGDataProviderCopyData(CGImageGetDataProvider(imgRef)); const unsigned char *sourceBytesPtr = CFDataGetBytePtr(dataRef); int len = CFDataGetLength(dataRef); NSLog(@"length = %d, width = %d, height = %d, bytes per row = %d, bit per pixels = %d", len, CGImageGetWidth(imgRef), CGImageGetHeight(imgRef), CGImageGetBytesPerRow(imgRef), CGImageGetBitsPerPixel(imgRef)); int width = CGImageGetWidth(imgRef); int height = CGImageGetHeight(imgRef); int widthstep = CGImageGetBytesPerRow(imgRef); unsigned char *pixelData = (unsigned char *)malloc(len); double wFrame = bgImage.frame.size.width; double hFrame = bgImage.frame.size.height; Image_Correction(sourceBytesPtr, pixelData, widthstep, width, height, wFrame, hFrame, point); NSLog(@"finish"); NSData *data = [NSData dataWithBytes:pixelData length:len]; NSLog(@"1"); CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)data); NSLog(@"2"); CGColorSpaceRef colorSpace2 = CGColorSpaceCreateDeviceRGB(); NSLog(@"3"); CGImageRef imageRef = CGImageCreate(width, height, 8, CGImageGetBitsPerPixel(imgRef), CGImageGetBytesPerRow(imgRef), colorSpace2,kCGImageAlphaNoneSkipFirst|kCGBitmapByteOrder32Host, provider, NULL, false, kCGRenderingIntentDefault); NSLog(@"Start processing image"); UIImage *ret = [UIImage imageWithCGImage:imageRef scale:1.0 orientation:UIImageOrientationUp]; CGImageRelease(imageRef); CGDataProviderRelease(provider); CGColorSpaceRelease(colorSpace2); CFRelease(dataRef); free(pixelData); NSLog(@"4"); bgImage.image = ret; [button removeFromSuperview]; } } - (UIColor*) getPixelColorAtLocation:(CGPoint)point { UIColor* color = nil; CGImageRef inImage = self.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; /* error */ } 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. int offset = 4*((w*round(point.y))+round(point.x)); alpha = data[offset]; red = data[offset+1]; green = data[offset+2]; 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)]; } // 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 = (pixelsWide * 4); bitmapByteCount = (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; } int Image_Correction(const unsigned char *pImage, unsigned char *rImage, int widthstep, int nW, int nH, double wFrame, double hFrame, ListPoint point) { double ratiox = nW/wFrame; double ratioy = nH/hFrame; double newW, newH, ratio; if(ratioy &gt; ratiox) { newH = hFrame; newW = nW/ratioy; ratio = ratioy; } else { newH = nH/ratiox; newW = wFrame; ratio = ratiox; } NSLog(@"new H, W = %f, %f", newW, newH); NSLog(@"ratiox = %f; ratioy = %f", ratiox, ratioy); ListPoint real_point; real_point.x = (point.x - wFrame/2 + newW/2) *ratio; real_point.y = (point.y - hFrame/2 + newH/2)*ratio; for(int h = 0; h &lt; nH; h++) { for(int k = 0; k &lt; nW; k++) { rImage[h*widthstep + k*4 + 0] = pImage[h*widthstep + k*4 + 0]; rImage[h*widthstep + k*4 + 1] = pImage[h*widthstep + k*4 + 1]; rImage[h*widthstep + k*4 + 2] = pImage[h*widthstep + k*4 + 2]; rImage[h*widthstep + k*4 + 3] = pImage[h*widthstep + k*4 + 3]; } } // Modify this parameter to change Blurred area int iBlurredArea = 6; for(int h = -ratio*iBlurredArea; h &lt;= ratio*iBlurredArea; h++) for(int k = -ratio*iBlurredArea; k &lt;= ratio*iBlurredArea; k++) { int tempx = real_point.x + k; int tempy = real_point.y + h; if (((tempy - 3) &gt; 0)&amp;&amp;((tempy+3) &gt;0)&amp;&amp;((tempx - 3) &gt; 0)&amp;&amp;((tempx + 3) &gt;0)) { double sumR = 0; double sumG = 0; double sumB = 0; double sumA = 0; double count = 0; for(int m = -3; m &lt; 4; m++) for (int n = -3; n &lt; 4; n++) { sumR = red;//sumR + pImage[(tempy + m)*widthstep + (tempx + n)*4 + 0]; sumG = green;//sumG + pImage[(tempy + m)*widthstep + (tempx + n)*4 + 1]; sumB = blue;//sumB + pImage[(tempy + m)*widthstep + (tempx + n)*4 + 2]; sumA = alpha;//sumA + pImage[(tempy + m)*widthstep + (tempx + n)*4 + 3]; count++; } rImage[tempy*widthstep + tempx*4 + 0] = red;//sumR/count; rImage[tempy*widthstep + tempx*4 + 1] = green;//sumG/count; rImage[tempy*widthstep + tempx*4 + 2] = blue;//sumB/count; rImage[tempy*widthstep + tempx*4 + 3] = alpha;//sumA/count; } } return 1; } </code></pre> <p>Thx for seeing this code.. i think i am doing something wrong. Thx in advance.</p>
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    1. USSandeep Singh
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      1. PORGB in image processing in iphone app
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    1. COYou'll get few responses to such a massive wall of code. If you want to increase your chances of getting an answer, you need to reduce this to a minimal example that demonstrates the problem.
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      1. USMarcelo Cantos
    2. COwhat are you trying to do, and what is the problem?
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    3. COI want to do that.. but may be something will be miss from code.. then ?
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      1. USSandeep Singh
 

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