daisy21 wrote:
> Does anyone know of any reference software to perform a DCT on an image?
> Does the image have to be in a certain format?

Our FFTW software (www.fftw.org) can compute 2d DCTs of arbitrary size,
given a matrix of floating-point numbers.

You should be aware that there are actually 8 types of DCT, with
slightly different boundary conditions.  The most common type is the
type-II DCT, however, so I'm guessing that this is what you want.

Regards,
Steven G. Johnson

daisy21 wrote:
> Hi,
> Does anyone know of any reference software to perform a DCT on an image?
> Does the image have to be in a certain format?
>
> Thanks!

I am going to venture a guess and say that if you took 5 seconds and
put 'discrete cosine transform' into a search engine, you would find
what you're looking for.

Hi,
Does anyone know of any reference software to perform a DCT on an image? 
Does the image have to be in a certain format?

Thanks!