- (UIImage *)pspdf_preloadedImage {
    CGImageRef image = self.CGImage;

    // make a bitmap context of a suitable size to draw to, forcing decode
    size_t width = CGImageGetWidth(image);
    size_t height = CGImageGetHeight(image);

    CGColorSpaceRef colourSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef imageContext =  CGBitmapContextCreate(NULL, width, height, 8, width*4, colourSpace,
                                                       kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little);
    CGColorSpaceRelease(colourSpace);

    // draw the image to the context, release it
    CGContextDrawImage(imageContext, CGRectMake(0, 0, width, height), image);

    // now get an image ref from the context
    CGImageRef outputImage = CGBitmapContextCreateImage(imageContext);

    UIImage *cachedImage = [UIImage imageWithCGImage:outputImage];

    // clean up
    CGImageRelease(outputImage);
    CGContextRelease(imageContext);

    return cachedImage;
}