Iphone Converting IplImage to UIImage images become bluish - iphone

Question

In face detection first I converted UIImage to Iplimage by using the code
- (IplImage *)CreateIplImageFromUIImage:(UIImage *)image {
CGImageRef imageRef;
CGColorSpaceRef colorSpaceRef;
CGContextRef context;
IplImage * iplImage;
IplImage * returnImage;
imageRef = image.CGImage;
colorSpaceRef = CGColorSpaceCreateDeviceRGB();
iplImage = cvCreateImage( cvSize( image.size.width, image.size.height ), IPL_DEPTH_8U, 4 );
context = CGBitmapContextCreate
(
iplImage->imageData,
iplImage->width,
iplImage->height,
iplImage->depth,
iplImage->widthStep,
colorSpaceRef,
kCGImageAlphaPremultipliedLast | kCGBitmapByteOrderDefault
);
CGContextDrawImage( context, CGRectMake( 0, 0, image.size.width, image.size.height ), imageRef );
CGContextRelease( context );
CGColorSpaceRelease( colorSpaceRef );
returnImage = cvCreateImage( cvGetSize( iplImage ), IPL_DEPTH_8U, 3 );
cvCvtColor( iplImage, returnImage, CV_RGBA2BGR);
cvReleaseImage( &iplImage );
return returnImage;
}
And then after detecting the facial features converted the iplimage to uiimage using the code:
- (UIImage *)UIImageFromIplImage:(IplImage *)image {
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();//CGColorSpaceCreateDeviceGray();
// Allocating the buffer for CGImage
NSData *data = [NSData dataWithBytes:image->imageData length:image->imageSize];
CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)data);
// Creating CGImage from chunk of IplImage
CGImageRef imageRef = CGImageCreate(image->width, image->height, image->depth, image->depth * image->nChannels, image->widthStep,
colorSpace, kCGImageAlphaNone|kCGBitmapByteOrderDefault, provider, NULL, false, kCGRenderingIntentDefault);
// Getting UIImage from CGImage
UIImage *ret = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
return ret;
}
but when it shown in the imageview it shows bluish. And if I use colorspace
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
Then the whole image becomes grayed. The original color becomes totally lost in both way.
Thanks in advance.

Answer 1

On changing the function UIImageFromIplImage the bluish or grayish problem is solved
- (UIImage *)UIImageFromIplImage:(IplImage *)image {
CGColorSpaceRef colorSpace;
if (image->nChannels == 1)
{
colorSpace = CGColorSpaceCreateDeviceGray();
} else {
colorSpace = CGColorSpaceCreateDeviceRGB();
cvCvtColor(image, image, CV_BGR2RGB);
}
NSData *data = [NSData dataWithBytes:image->imageData length:image->imageSize];
CGDataProviderRef provider = CGDataProviderCreateWithCFData(( CFDataRef)data);
CGImageRef imageRef = CGImageCreate(image->width,
image->height,
image->depth,
image->depth * image->nChannels,
image->widthStep,
colorSpace,
kCGImageAlphaNone|kCGBitmapByteOrderDefault,
provider,
NULL,
false,
kCGRenderingIntentDefault
);
UIImage *ret = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
return ret;
}