Help finding memory leak - objective-c

Question

Can any one help me to find the memory leak in the below code, which adjusts the brightness of an image?
+(NSImage *)brightness:(NSImage *)image andLevel:(int)level
{
CGImageSourceRef source= CGImageSourceCreateWithData((CFDataRef)[image TIFFRepresentation], NULL);
CGImageRef img = CGImageSourceCreateImageAtIndex(source, 0, NULL);
NSSize size = image.size;
CGRect rect = CGRectMake(0.0f, 0.0f, size.width, size.height);
//getting bitmap data from receiver's CGImage
CFDataRef dataref=CGDataProviderCopyData(CGImageGetDataProvider(img));
//getting bytes from bitmap image
UInt8 *data=(UInt8 *)CFDataGetBytePtr(dataref);
//getting length
int length=CFDataGetLength(dataref);
// Perform operation on pixels
for(int index=0;index<length;index += 1)
{
// Go For BRIGHTNESS
for(int i=0;i<3;i++)
{
//printf("This pixel is:%d",data[index + i]);
if(data[index+i]+level<0)
{
data[index+i]=0;
}
else
{
if(data[index+i]+level>255)
{
data[index+i]=255;
}
else
{
data[index+i]+=level;
}
}
}
}
// .. Take image attributes
size_t width=CGImageGetWidth(img);
size_t height=CGImageGetHeight(img);
size_t bitsPerComponent=CGImageGetBitsPerComponent(img);
size_t bitsPerPixel=CGImageGetBitsPerPixel(img);
size_t bytesPerRow=CGImageGetBytesPerRow(img);
// .. Do the pixel manupulation
CGColorSpaceRef colorspace=CGImageGetColorSpace(img);
CGBitmapInfo bitmapInfo=CGImageGetBitmapInfo(img);
CFDataRef newData=CFDataCreate(NULL,data,length);
CGDataProviderRef provider=CGDataProviderCreateWithCFData(newData);
// .. Get the Image out of this raw data
CGImageRef newImg=CGImageCreate(width,height,bitsPerComponent,bitsPerPixel,bytesPerRow,colorspace,bitmapInfo,provider,NULL,true,kCGRenderingIntentDefault);
// .. Prepare the image from raw data
NSImage* newImage = [[NSImage alloc] initWithSize:size];
//To make the drawing appear on the image instead of on the screen
[newImage lockFocus];
//Draws an image into a graphics context.
CGContextDrawImage([[NSGraphicsContext currentContext] graphicsPort],*(CGRect*)&rect, newImg);
[newImage unlockFocus];
// .. done with all,so release the references
CFRelease(source);
CFRelease(img);
CFRelease(dataref);
CFRelease(colorspace);
CFRelease(newData);
CFRelease(provider);
return [newImage autorelease];
}

Answer 1

You’ve forgotten to release newImg, which you’ve obtained via a Create function. Also, you shouldn’t release colorSpace since you haven’t obtained it via a Create or Copy function and you haven’t retained it.

Answer 2

Replace the following code lines:
NSImage* newImage = [[NSImage alloc] initWithSize:size];
with
NSImage* newImage = [[[NSImage alloc] initWithSize:size] autorelease];
and this one: return [newImage autorelease]; with return newImage;
I'm not 100% sure about this but give it a try, hope it might help.
:)