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=== Quantization matrices ===
A quantization matrix is used in combination with a DCT coefficient matrix to carry out the previously mentioned transformation. Quantization matrices are often specifically designed to keep certain frequencies in the source to avoid losing image quality. Many video encoders, such as [[MPEG-2]], [[DivX]], [[Xvid]], [[3ivx]] and [[H.264/AVC]] allow custom matrices to be used.
This is an example of DCT coefficient matrix: <!--NOTE: this matrix was generated using random numbers and the other two matricies. It may not actually work well with an iDCT. -->
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