Matrox MXO2 PCIe Host Adapter - Manual (Page 168)

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Chapter 9, Setting Up Matrox Effects with Adobe Premiere Pro
Using the Matrox chroma clamper effect
You can use the Matrox chroma clamper effect to ensure that when you’ve
applied effects that perform color space conversion on part of a clip, the clip’s
colors remain constant throughout. Some Adobe Premiere Pro native effects
perform color space conversions (YUV to RGB) that will clip RGB values to the
acceptable range of 0-255 per color component. The clipping, however, is usually
only required on clips that have very bright or highly saturated colors.
For example, if you split a clip that contains very bright or highly saturated colors
and apply an Adobe basic 3D effect to one portion of the clip, you may notice
minor color differences between the two halves on your video monitor. Applying
the Matrox chroma clamper effect to the portion of the clip that does not have the
Adobe effect ensures that colors remain constant throughout the clip.