gistfile1.m

+(UIImage *)thumbnailForImage:(UIImage *)image withSize:(CGSize)size{
        CGImageRef sourceImage = [image CGImage];
        const char *byteData = malloc(CGImageGetBytesPerRow(sourceImage) * 75);
        if(malloc == NULL) return nil;

        CGBitmapInfo info = CGImageGetBitmapInfo(sourceImage);
        CGContextRef context = CGBitmapContextCreate(byteData, 75, 75,CGImageGetBitsPerComponent(sourceImage), CGImageGetBytesPerRow(sourceImage), CGImageGetColorSpace(sourceImage), info);
        CGContextDrawImage(context, CGRectMake(0,0,size.width, size.height), sourceImage);
        CGImageRef destImage = CGBitmapContextCreateImage(context);

        UIImage *img = [[UIImage alloc] initWithCGImage:destImage];

        CGImageRelease(destImage);
        CGContextRelease(context);
        free(byteData);

        return [img autorelease];
}