ive updated my project to IOS 7 and now i am getting this error when resizing an image once added/taken within the app here is my code
-(UIImage *)resizeImage:(UIImage *)anImage width:(int)width height:(int)height
{
CGImageRef imageRef = [anImage CGImage];
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
if (alphaInfo == kCGImageAlphaNone)
alphaInfo = kCGImageAlphaNoneSkipLast;
CGContextRef bitmap = CGBitmapContextCreate(NULL, width, height, CGImageGetBitsPerComponent(imageRef), 4 * width, CGImageGetColorSpace(imageRef), alphaInfo);
CGContextDrawImage(bitmap, CGRectMake(0, 0, width, height), imageRef);
CGImageRef ref = CGBitmapContextCreateImage(bitmap);
UIImage *result = [UIImage imageWithCGImage:ref];
CGContextRelease(bitmap);
CGImageRelease(ref);
return result;
}
The error im getting is this
Implicit conversion from enumeration type 'CGImageAlphaInfo' (aka 'enum CGImageAlphaInfo') to different enumeration type 'CGBitmapInfo' (aka 'enum CGBitmapInfo')
I have inserted (CGBitmapInfo) before your variable alphaInfo.
Hope it solves your problem
-(UIImage *)resizeImage:(UIImage *)anImage width:(int)width height:(int)height
{
CGImageRef imageRef = [anImage CGImage];
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
if (alphaInfo == kCGImageAlphaNone)
alphaInfo = kCGImageAlphaNoneSkipLast;
CGContextRef bitmap = CGBitmapContextCreate(NULL, width, height, CGImageGetBitsPerComponent(imageRef), 4 * width, CGImageGetColorSpace(imageRef), (CGBitmapInfo)alphaInfo);
CGContextDrawImage(bitmap, CGRectMake(0, 0, width, height), imageRef);
CGImageRef ref = CGBitmapContextCreateImage(bitmap);
UIImage *result = [UIImage imageWithCGImage:ref];
CGContextRelease(bitmap);
CGImageRelease(ref);
return result;
}
Related
I have 3 files, one with only a red channel, one with only a green channel, one with only a blue channel. Now i want to combine those 3 images to one, where every image is one color-channel in the finished image.
How can i do this with cocoa? I have a solution that is working but is too slow:
NSBitmapImageRep *rRep = [[rImage representations] objectAtIndex: 0];
NSBitmapImageRep *gRep = [[gImage representations] objectAtIndex: 0];
NSBitmapImageRep *bRep = [[bImage representations] objectAtIndex: 0];
NSBitmapImageRep *finalRep = [rRep copy];
for (NSUInteger i = 0; i < [rRep pixelsWide]; i++) {
for (NSUInteger j = 0; j < [rRep pixelsHigh]; j++) {
CGFloat r = [[rRep colorAtX:i y:j] redComponent];
CGFloat g = [[gRep colorAtX:i y:j] greenComponent];
CGFloat b = [[bRep colorAtX:i y:j] blueComponent];
[finalRep setColor:[NSColor colorWithCalibratedRed:r green:g blue:b alpha:1.0] atX:i y:j];
}
}
NSData *data = [finalRep representationUsingType:NSJPEGFileType properties:[NSDictionary dictionaryWithObject:[NSNumber numberWithDouble:0.7] forKey:NSImageCompressionFactor]];
[data writeToURL:[panel URL] atomically:YES];
The Accelerate.framework provides a function to combine 3 planar images into one destination:
vImageConvert_Planar8toRGB888.
I haven't tried your approach but the vImage based method below is quite fast.
I was able to combine three (R,G,B) planes of a 1680x1050 image in ~0.1s on my Mac. The actual conversion takes ~1/3 of that time - The rest is setup & file IO.
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
NSDate* start = [NSDate date];
NSURL* redImageURL = [[NSBundle mainBundle] URLForImageResource:#"red"];
NSURL* greenImageURL = [[NSBundle mainBundle] URLForImageResource:#"green"];
NSURL* blueImageURL = [[NSBundle mainBundle] URLForImageResource:#"blue"];
NSData* redImageData = [self newChannelDataFromImageAtURL:redImageURL];
NSData* greenImageData = [self newChannelDataFromImageAtURL:greenImageURL];
NSData* blueImageData = [self newChannelDataFromImageAtURL:blueImageURL];
//We use our "Red" image to measure the dimensions. We assume that all images & the destination have the same size
CGImageSourceRef imageSource = CGImageSourceCreateWithURL((__bridge CFURLRef)redImageURL, NULL);
NSDictionary* properties = (__bridge NSDictionary*)CGImageSourceCopyPropertiesAtIndex(imageSource, 0, NULL);
CGFloat width = [properties[(id)kCGImagePropertyPixelWidth] doubleValue];
CGFloat height = [properties[(id)kCGImagePropertyPixelHeight] doubleValue];
self.image = [self newImageWithSize:CGSizeMake(width, height) fromRedChannel:redImageData greenChannel:greenImageData blueChannel:blueImageData];
NSLog(#"Combining 3 (R, G, B) planes of size %# took:%fs", NSStringFromSize(CGSizeMake(width, height)), [[NSDate date] timeIntervalSinceDate:start]);
}
- (NSImage*)newImageWithSize:(CGSize)size fromRedChannel:(NSData*)redImageData greenChannel:(NSData*)greenImageData blueChannel:(NSData*)blueImageData
{
vImage_Buffer redBuffer;
redBuffer.data = (void*)redImageData.bytes;
redBuffer.width = size.width;
redBuffer.height = size.height;
redBuffer.rowBytes = [redImageData length]/size.height;
vImage_Buffer greenBuffer;
greenBuffer.data = (void*)greenImageData.bytes;
greenBuffer.width = size.width;
greenBuffer.height = size.height;
greenBuffer.rowBytes = [greenImageData length]/size.height;
vImage_Buffer blueBuffer;
blueBuffer.data = (void*)blueImageData.bytes;
blueBuffer.width = size.width;
blueBuffer.height = size.height;
blueBuffer.rowBytes = [blueImageData length]/size.height;
size_t destinationImageBytesLength = size.width*size.height*3;
const void* destinationImageBytes = valloc(destinationImageBytesLength);
NSData* destinationImageData = [[NSData alloc] initWithBytes:destinationImageBytes length:destinationImageBytesLength];
vImage_Buffer destinationBuffer;
destinationBuffer.data = (void*)destinationImageData.bytes;
destinationBuffer.width = size.width;
destinationBuffer.height = size.height;
destinationBuffer.rowBytes = [destinationImageData length]/size.height;
vImage_Error result = vImageConvert_Planar8toRGB888(&redBuffer, &greenBuffer, &blueBuffer, &destinationBuffer, 0);
NSImage* image = nil;
if(result == kvImageNoError)
{
//TODO: If you need color matching, use an appropriate colorspace here
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGDataProviderRef dataProvider = CGDataProviderCreateWithCFData((__bridge CFDataRef)(destinationImageData));
CGImageRef finalImageRef = CGImageCreate(size.width, size.height, 8, 24, destinationBuffer.rowBytes, colorSpace, kCGBitmapByteOrder32Big|kCGImageAlphaNone, dataProvider, NULL, NO, kCGRenderingIntentDefault);
CGColorSpaceRelease(colorSpace);
CGDataProviderRelease(dataProvider);
image = [[NSImage alloc] initWithCGImage:finalImageRef size:NSMakeSize(size.width, size.height)];
CGImageRelease(finalImageRef);
}
free((void*)destinationImageBytes);
return image;
}
- (NSData*)newChannelDataFromImageAtURL:(NSURL*)imageURL
{
CGImageSourceRef imageSource = CGImageSourceCreateWithURL((__bridge CFURLRef)imageURL, NULL);
if(imageSource == NULL){return NULL;}
CGImageRef image = CGImageSourceCreateImageAtIndex(imageSource, 0, NULL);
CFRelease(imageSource);
if(image == NULL){return NULL;}
CGColorSpaceRef colorSpace = CGImageGetColorSpace(image);
CGFloat width = CGImageGetWidth(image);
CGFloat height = CGImageGetHeight(image);
size_t bytesPerRow = CGImageGetBytesPerRow(image);
CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(image);
CGContextRef bitmapContext = CGBitmapContextCreate(NULL, width, height, 8, bytesPerRow, colorSpace, bitmapInfo);
NSData* data = NULL;
if(NULL != bitmapContext)
{
CGContextDrawImage(bitmapContext, CGRectMake(0.0, 0.0, width, height), image);
CGImageRef imageRef = CGBitmapContextCreateImage(bitmapContext);
if(NULL != imageRef)
{
data = (NSData*)CFBridgingRelease(CGDataProviderCopyData(CGImageGetDataProvider(imageRef)));
}
CGImageRelease(imageRef);
CGContextRelease(bitmapContext);
}
CGImageRelease(image);
return data;
}
Your program creates many many many many many many color objects.
Although your program could simply access the image reps' bitmapData, it would require your program to know a lot about bitmap representations.
Before taking that approach, you should prefer to let Quartz do the heavy lifting by rendering each image to a CGBitmapContext (e.g. using CGContextDrawImage(gtx, rect, img.CGImage)) and then extracting/copying the rendered component values from the rendered result over to a destination RGB bitmap.
If your inputs are not multicomponent color models (e.g. grayscale), then you should render to the source color model to save a bunch of CPU time and memory.
Here with below code PDF gets created but i am able to write in PDF.But i am not able to render NSView in PDF
CGContextRef aCgPDFContextRef = [self createPDFContext:CGRectMake(0, 0, 612, 892) path:(CFStringRef)filepath];
CGContextBeginPage(aCgPDFContextRef,nil);
//Draw view into PDF
NSView *aPageNote=[[NSView alloc]initWithFrame:CGRectMake(0,0, 612, 892)];
CGAffineTransform aCgAffTrans = CGAffineTransformIdentity;
aCgAffTrans = CGAffineTransformMakeTranslation(0,892);
aCgAffTrans = CGAffineTransformScale(aCgAffTrans, 1.0, -1.0);
CGContextConcatCTM(aCgPDFContextRef, aCgAffTrans);
NSString *strText = #"Test 123333333333333333";
[strText drawAtPoint:NSMakePoint(100, 200) withAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[NSFont systemFontOfSize:40.0],NSFontAttributeName,nil]];//drawAtPoint:CGPointMake(200, 300) withFont:[NSFont systemFontOfSize:20]];
[aPageNote setWantsLayer:YES];
[aPageNote.layer renderInContext:aCgPDFContextRef];
CGContextEndPage(aCgPDFContextRef);
CGContextRelease (aCgPDFContextRef);
NSLog(#"Pdf Successfully Created");
The Method :
-(CGContextRef) createPDFContext:(CGRect)aCgRectinMediaBox path:(CFStringRef) aCfStrPath
{
CGContextRef aCgContextRefNewPDF = NULL;
CFURLRef aCfurlRefPDF;
aCfurlRefPDF = CFURLCreateWithFileSystemPath (NULL,aCfStrPath,kCFURLPOSIXPathStyle,false);
if (aCfurlRefPDF != NULL) {
aCgContextRefNewPDF = CGPDFContextCreateWithURL (aCfurlRefPDF,&aCgRectinMediaBox,NULL);
CFRelease(aCfurlRefPDF);
}
return aCgContextRefNewPDF;
}
EDIT : I am able to write in PDF using this code
CGContextBeginPage(aCgPDFContextRef,nil);
NSString *strText1 = #"I am iOS Developer";
CGContextSelectFont (aCgPDFContextRef, "Helvetica", 24, kCGEncodingMacRoman);
CGContextSetTextDrawingMode (aCgPDFContextRef, kCGTextFill);
CGContextSetRGBFillColor (aCgPDFContextRef, 0, 0, 0, 1);
const char *text1 = [strText1 UTF8String];
CGContextShowTextAtPoint (aCgPDFContextRef, 50, 375, text1, strlen(text1));
CGContextEndPage(aCgPDFContextRef);
EDIT : Render NSView and add as image into PDF like this:
//Firstly render NS element into NSImage
NSImage *i = [[NSImage alloc] initWithData:[yourView dataWithPDFInsideRect:[yourView bounds]]];
//Now u can add in PDF
CGImageSourceRef source = CGImageSourceCreateWithData((CFDataRef)[i TIFFRepresentation], NULL);
CGImageRef imageRef = CGImageSourceCreateImageAtIndex(source, 0, NULL);
CGContextDrawImage(aCgPDFContextRef,[yourView bounds], imageRef);
while working with OpenCV I need to convert a NSImage to an OpenCV multi-channel 2D matrix (cvMat) and vice versa.
What's the best way to do it?
Greets,
Dom
Here's my outcome, which works pretty well.
NSImage+OpenCV.h:
//
// NSImage+OpenCV.h
//
#import <AppKit/AppKit.h>
#interface NSImage (NSImage_OpenCV) {
}
+(NSImage*)imageWithCVMat:(const cv::Mat&)cvMat;
-(id)initWithCVMat:(const cv::Mat&)cvMat;
#property(nonatomic, readonly) cv::Mat CVMat;
#property(nonatomic, readonly) cv::Mat CVGrayscaleMat;
#end
NSImage+OpenCV.mm:
//
// NSImage+OpenCV.mm
//
#import "NSImage+OpenCV.h"
static void ProviderReleaseDataNOP(void *info, const void *data, size_t size)
{
return;
}
#implementation NSImage (NSImage_OpenCV)
-(CGImageRef)CGImage
{
CGContextRef bitmapCtx = CGBitmapContextCreate(NULL/*data - pass NULL to let CG allocate the memory*/,
[self size].width,
[self size].height,
8 /*bitsPerComponent*/,
0 /*bytesPerRow - CG will calculate it for you if it's allocating the data. This might get padded out a bit for better alignment*/,
[[NSColorSpace genericRGBColorSpace] CGColorSpace],
kCGBitmapByteOrder32Host|kCGImageAlphaPremultipliedFirst);
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithGraphicsPort:bitmapCtx flipped:NO]];
[self drawInRect:NSMakeRect(0,0, [self size].width, [self size].height) fromRect:NSZeroRect operation:NSCompositeCopy fraction:1.0];
[NSGraphicsContext restoreGraphicsState];
CGImageRef cgImage = CGBitmapContextCreateImage(bitmapCtx);
CGContextRelease(bitmapCtx);
return cgImage;
}
-(cv::Mat)CVMat
{
CGImageRef imageRef = [self CGImage];
CGColorSpaceRef colorSpace = CGImageGetColorSpace(imageRef);
CGFloat cols = self.size.width;
CGFloat rows = self.size.height;
cv::Mat cvMat(rows, cols, CV_8UC4); // 8 bits per component, 4 channels
CGContextRef contextRef = CGBitmapContextCreate(cvMat.data, // Pointer to backing data
cols, // Width of bitmap
rows, // Height of bitmap
8, // Bits per component
cvMat.step[0], // Bytes per row
colorSpace, // Colorspace
kCGImageAlphaNoneSkipLast |
kCGBitmapByteOrderDefault); // Bitmap info flags
CGContextDrawImage(contextRef, CGRectMake(0, 0, cols, rows), imageRef);
CGContextRelease(contextRef);
CGImageRelease(imageRef);
return cvMat;
}
-(cv::Mat)CVGrayscaleMat
{
CGImageRef imageRef = [self CGImage];
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
CGFloat cols = self.size.width;
CGFloat rows = self.size.height;
cv::Mat cvMat = cv::Mat(rows, cols, CV_8UC1); // 8 bits per component, 1 channel
CGContextRef contextRef = CGBitmapContextCreate(cvMat.data, // Pointer to backing data
cols, // Width of bitmap
rows, // Height of bitmap
8, // Bits per component
cvMat.step[0], // Bytes per row
colorSpace, // Colorspace
kCGImageAlphaNone |
kCGBitmapByteOrderDefault); // Bitmap info flags
CGContextDrawImage(contextRef, CGRectMake(0, 0, cols, rows), imageRef);
CGContextRelease(contextRef);
CGColorSpaceRelease(colorSpace);
CGImageRelease(imageRef);
return cvMat;
}
+ (NSImage *)imageWithCVMat:(const cv::Mat&)cvMat
{
return [[[NSImage alloc] initWithCVMat:cvMat] autorelease];
}
- (id)initWithCVMat:(const cv::Mat&)cvMat
{
NSData *data = [NSData dataWithBytes:cvMat.data length:cvMat.elemSize() * cvMat.total()];
CGColorSpaceRef colorSpace;
if (cvMat.elemSize() == 1)
{
colorSpace = CGColorSpaceCreateDeviceGray();
}
else
{
colorSpace = CGColorSpaceCreateDeviceRGB();
}
CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data);
CGImageRef imageRef = CGImageCreate(cvMat.cols, // Width
cvMat.rows, // Height
8, // Bits per component
8 * cvMat.elemSize(), // Bits per pixel
cvMat.step[0], // Bytes per row
colorSpace, // Colorspace
kCGImageAlphaNone | kCGBitmapByteOrderDefault, // Bitmap info flags
provider, // CGDataProviderRef
NULL, // Decode
false, // Should interpolate
kCGRenderingIntentDefault); // Intent
NSBitmapImageRep *bitmapRep = [[NSBitmapImageRep alloc] initWithCGImage:imageRef];
NSImage *image = [[NSImage alloc] init];
[image addRepresentation:bitmapRep];
CGImageRelease(imageRef);
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpace);
return image;
}
#end
Example usage:
Just import it like this:
#import "NSImage+OpenCV.h"
And use it like this:
cv::Mat cvMat_test;
NSImage *image = [NSImage imageNamed:#"test.jpg"];
cvMat_test = [image CVMat];
[myImageView setImage:[NSImage imageWithCVMat:cvMat_test]];
In -(id)initWithCVMat:(const cv::Mat&)cvMat, shouldn't you be adding the representation to self, rather than a new NSImage?
-(id)initWithCVMat:(const cv::Mat *)iMat
{
if(self = [super init]) {
NSData *tData = [NSData dataWithBytes:iMat->data length:iMat->elemSize() * iMat->total()];
CGColorSpaceRef tColorSpace;
if(iMat->elemSize() == 1) {
tColorSpace = CGColorSpaceCreateDeviceGray();
} else {
tColorSpace = CGColorSpaceCreateDeviceRGB();
}
CGDataProviderRef tProvider = CGDataProviderCreateWithCFData((CFDataRef) tData);
CGImageRef tImage = CGImageCreate(
iMat->cols,
iMat->rows,
8,
8 * iMat->elemSize(),
iMat->step[0],
tColorSpace,
kCGImageAlphaNone | kCGBitmapByteOrderDefault,
tProvider,
NULL,
false,
kCGRenderingIntentDefault);
NSBitmapImageRep *tBitmap = [[NSBitmapImageRep alloc] initWithCGImage:tImage];
[self addRepresentation:tBitmap];
[tBitmap release];
CGImageRelease(tImage);
CGDataProviderRelease(tProvider);
CGColorSpaceRelease(tColorSpace);
}
return self;
}
I have a CALayer (containerLayer) that I'm looking to convert to a NSBitmapImageRep before saving the data out as a flat file. containerLayer has its geometryFlipped property set to YES, and this seems to be causing issues. The PNG file that is ultimately generated renders the content correctly, but doesn't seem to takes the flipped geometry into account. I'm obviously looking for test.png to accurately represent the content shown to the left.
Attached below is a screenshot of the problem and the code I'm working with.
- (NSBitmapImageRep *)exportToImageRep
{
CGContextRef context = NULL;
CGColorSpaceRef colorSpace;
int bitmapByteCount;
int bitmapBytesPerRow;
int pixelsHigh = (int)[[self containerLayer] bounds].size.height;
int pixelsWide = (int)[[self containerLayer] bounds].size.width;
bitmapBytesPerRow = (pixelsWide * 4);
bitmapByteCount = (bitmapBytesPerRow * pixelsHigh);
colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
context = CGBitmapContextCreate (NULL,
pixelsWide,
pixelsHigh,
8,
bitmapBytesPerRow,
colorSpace,
kCGImageAlphaPremultipliedLast);
if (context == NULL)
{
NSLog(#"Failed to create context.");
return nil;
}
CGColorSpaceRelease(colorSpace);
[[[self containerLayer] presentationLayer] renderInContext:context];
CGImageRef img = CGBitmapContextCreateImage(context);
NSBitmapImageRep *bitmap = [[NSBitmapImageRep alloc] initWithCGImage:img];
CFRelease(img);
return bitmap;
}
For reference, here's the code that actually saves out the generated NSBitmapImageRep:
NSData *imageData = [imageRep representationUsingType:NSPNGFileType properties:nil];
[imageData writeToFile:#"test.png" atomically:NO];
You need to flip the destination context BEFORE you render into it.
Update your code with this, I have just solved the same problem:
CGAffineTransform flipVertical = CGAffineTransformMake(1, 0, 0, -1, 0, pixelsHigh);
CGContextConcatCTM(context, flipVertical);
[[[self containerLayer] presentationLayer] renderInContext:context];
I am taking pictures from the iPhone camera using the UIImagePickerController Class.
I am using this delegate method for getting the image.
- (void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
{
UIImage *image = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
}
But when I am using that image in an ImageView or sending the image data to some url, the image is appearing rotated by 90 degree.
What is the issue ? Am i doing it correctly ?
Thanks
You need to rotate the picture yourself depending on your orientation.
Use this Code (it may also resize your picture) I found it somewhere in the net, but cannot remember where:
#implementation UIImage (Resizing)
static inline double radians (double degrees) {return degrees * M_PI/180;}
- (UIImage*)imageByScalingToSize:(CGSize)targetSize {
UIImage* sourceImage = self;
CGFloat targetWidth = targetSize.width;
CGFloat targetHeight = targetSize.height;
CGImageRef imageRef = [sourceImage CGImage];
CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef);
CGColorSpaceRef colorSpaceInfo = CGImageGetColorSpace(imageRef);
if (bitmapInfo == kCGImageAlphaNone) {
bitmapInfo = kCGImageAlphaNoneSkipLast;
}
CGContextRef bitmap;
if (sourceImage.imageOrientation == UIImageOrientationUp || sourceImage.imageOrientation == UIImageOrientationDown) {
bitmap = CGBitmapContextCreate(NULL, targetWidth, targetHeight, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo);
} else {
bitmap = CGBitmapContextCreate(NULL, targetHeight, targetWidth, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo);
}
if (sourceImage.imageOrientation == UIImageOrientationLeft) {
CGContextRotateCTM (bitmap, radians(90));
CGContextTranslateCTM (bitmap, 0, -targetHeight);
} else if (sourceImage.imageOrientation == UIImageOrientationRight) {
CGContextRotateCTM (bitmap, radians(-90));
CGContextTranslateCTM (bitmap, -targetWidth, 0);
} else if (sourceImage.imageOrientation == UIImageOrientationUp) {
// NOTHING
} else if (sourceImage.imageOrientation == UIImageOrientationDown) {
CGContextTranslateCTM (bitmap, targetWidth, targetHeight);
CGContextRotateCTM (bitmap, radians(-180.));
}
CGContextDrawImage(bitmap, CGRectMake(0, 0, targetWidth, targetHeight), imageRef);
CGImageRef ref = CGBitmapContextCreateImage(bitmap);
UIImage* newImage = [UIImage imageWithCGImage:ref];
//CGContextRelease(bitmap);
//CGImageRelease(ref);
return newImage;
}
#end