Library for image downsizing

[Fe++]

I have to implement a program that perform downsizing resolution of YCrCb (YUV420) image. I need the better performance as possible. What library are optimal for this objective?
Thanks in advance.
Best regards

[LoRd_MuldeR]

I'd say: Look at "libswscale" from the FFmpeg/MPlayer project or at Avisynth' resizers. Probably even ImageMagick has suitable code...

[Fe++]

I see for ffmpeg swscale and for imagemagick, both perform the operation of image resize, but imagemagick seems more complete for image editing. For evaluate performance I have to do some test. thanks