How to convert UIImage to J2K (JPEG2000) in iOS?

Question

I managed to get OpenJPEG to compile in my iOS application, but I don’t know where to start converting UIImage to J2K file or J2K to memory buffer. Suggestions?

Answer 1

Obviously, ImageIO can do this. You need to add the io framework image to your project, and then this code works for me:

#import <ImageIO/ImageIO.h> // or @import ImageIO if modules enabled
#import <MobileCoreServices/MobileCoreServices.h>

// ...    

// quality is 0-1 (0 = smallest file size, 1 = lossless quality)
+ (NSData*) convertToJPEG2000:(UIImage*)image withQuality:(float)quality
{
    NSMutableData* d = [NSMutableData data];
    CGImageDestinationRef destinationRef = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)d, kUTTypeJPEG2000, 1, NULL);
    CGImageDestinationSetProperties(destinationRef, NULL);
    CGImageDestinationAddImage(destinationRef, image.CGImage, (__bridge CFDictionaryRef)@{ (NSString*)kCGImageDestinationLossyCompressionQuality: @(quality) });

    if (!CGImageDestinationFinalize(destinationRef))
    {
        d = nil;
    }
    CFRelease(destinationRef);

    return d;
}