如何将原始图像文件“上传”到iOS模拟器,使其在AssetsLibrary框架中的显示方式与通过摄像头连接工具包从摄像头复制到iPad的原始图像相同?
(我知道如何在iOS模拟器中存储普通的JPEG和PNG图像。这不是问题所在。)
发布于 2011-05-05 18:20:54
只需使用
writeImageDataToSavedPhotosAlbum:metadata:completionBlock:
若要将原始文件的ImageData写入已保存的相册,请执行以下操作。iOS支持许多RAW格式(绝对支持佳能和尼康)。当您将原始文件添加到库中时,AssetLibrary会自动为原始文件创建jpeg和预览。
发布于 2011-04-09 19:03:32
我不太熟悉原始数据,但我能够将PNG图像转换为原始数据,然后再转换回图像。下面是我用来转换为图片的代码:
- (UIImage *) convertBitmapRGBA8ToUIImage:(unsigned char *) buffer
withWidth:(int) width
withHeight:(int) height {
size_t bufferLength = width * height * 4;
CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, buffer, bufferLength, NULL);
size_t bitsPerComponent = 8;
size_t bitsPerPixel = 32;
size_t bytesPerRow = 4 * width;
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
if(colorSpaceRef == NULL) {
NSLog(@"Error allocating color space");
CGDataProviderRelease(provider);
return nil;
}
CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
CGImageRef iref = CGImageCreate(width,
height,
bitsPerComponent,
bitsPerPixel,
bytesPerRow,
colorSpaceRef,
bitmapInfo,
provider, // data provider
NULL, // decode
YES, // should interpolate
renderingIntent);
uint32_t* pixels = (uint32_t*)malloc(bufferLength);
if(pixels == NULL) {
NSLog(@"Error: Memory not allocated for bitmap");
CGDataProviderRelease(provider);
CGColorSpaceRelease(colorSpaceRef);
CGImageRelease(iref);
return nil;
}
CGContextRef context = CGBitmapContextCreate(pixels,
width,
height,
bitsPerComponent,
bytesPerRow,
colorSpaceRef,
kCGImageAlphaPremultipliedLast);
if(context == NULL) {
NSLog(@"Error context not created");
free(pixels);
}
UIImage *image = nil;
if(context) {
CGContextDrawImage(context, CGRectMake(0.0f, 0.0f, width, height), iref);
CGImageRef imageRef = CGBitmapContextCreateImage(context);
// Support both iPad 3.2 and iPhone 4 Retina displays with the correct scale
if([UIImage respondsToSelector:@selector(imageWithCGImage:scale:orientation:)]) {
float scale = [[UIScreen mainScreen] scale];
image = [UIImage imageWithCGImage:imageRef scale:scale orientation:UIImageOrientationUp];
} else {
image = [UIImage imageWithCGImage:imageRef];
}
CGImageRelease(imageRef);
CGContextRelease(context);
}
CGColorSpaceRelease(colorSpaceRef);
CGImageRelease(iref);
CGDataProviderRelease(provider);
if(pixels) {
free(pixels);
}
return image;
}我真的记不住来源了,但它对我很有效。
你能用你的代码加载原始图像吗?如果是,只需将数据传递给上面的函数(您还需要图像的宽度和高度才能正确转换)。
https://stackoverflow.com/questions/5600898
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