如何在iOS中将UIImage转换为J2K（JPEG2000）？ [英] How do I convert UIImage to J2K (JPEG2000) in iOS?

问题描述

我已经设法让OpenJPEG在我的iOS应用程序中编译，但我不知道从哪里开始尝试将UIImage转换为J2K文件或J2K在内存缓冲区中。建议？

I have managed to get OpenJPEG to compile in my iOS app, but I have no clue where to begin trying to convert a UIImage to a J2K file or J2K in memory buffer. Suggestions?

推荐答案

显然ImageIO可以做到这一点。你需要在你的项目中添加image io框架，然后这段代码对我有用：

Apparently ImageIO can do this. You'll need to add image io framework to your project and then this code is working 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;
}

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