Rodney V. Smith
DVXFest Promo Guru
from wikipedia:
Masks, Mattes, Power Windows
The evolution of digital color correction tools advanced to the point where the colorist could use geometric shapes (like mattes or masks in photo software such as Photoshop) to isolate color adjustments to specific areas of an image. Called Power Windows by da Vinci Systems, these tools can highlight a wall in the background and color only that wall — leaving the rest of the frame alone — or color everything but that wall. Subsequent color correctors (typically software-based) have the ability to use spline-based shapes for even greater control over isolating color adjustments. Color keying is also used for isolating areas to adjust.
Inside and outside of area-based isolations, digital filtration can be applied to soften, sharpen or mimic the effects of traditional glass photographic filters in nearly infinite degrees.
Motion Tracking
When trying to isolate a color adjustment on a moving subject, the colorist traditionally would have needed to manually move the mask to follow the subject. In its most simple form, motion tracking automates this time-consuming process using algorithms to evaluate the motion of a group of pixels. These techniques are generally derived from match moving techniques used in special effects and compositing work.
Also here's a good description:
Motion tracking can be combined with other techniques to add light to a subject's eyes or achieve the final look wanted for a scene, this not only saves time on the set (and money) but, when done in close collaboration with the cinematographer, allows greater flexibility in adjusting the overall feeling of the scene.
Masks, Mattes, Power Windows
The evolution of digital color correction tools advanced to the point where the colorist could use geometric shapes (like mattes or masks in photo software such as Photoshop) to isolate color adjustments to specific areas of an image. Called Power Windows by da Vinci Systems, these tools can highlight a wall in the background and color only that wall — leaving the rest of the frame alone — or color everything but that wall. Subsequent color correctors (typically software-based) have the ability to use spline-based shapes for even greater control over isolating color adjustments. Color keying is also used for isolating areas to adjust.
Inside and outside of area-based isolations, digital filtration can be applied to soften, sharpen or mimic the effects of traditional glass photographic filters in nearly infinite degrees.
Motion Tracking
When trying to isolate a color adjustment on a moving subject, the colorist traditionally would have needed to manually move the mask to follow the subject. In its most simple form, motion tracking automates this time-consuming process using algorithms to evaluate the motion of a group of pixels. These techniques are generally derived from match moving techniques used in special effects and compositing work.
Also here's a good description:
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Color correction, (also known as color grading) is much more than fixing problems with a film or video. It's a great way to enhance the style, look & mood of a film or video, and can make an already well shot & good looking film look even better.
Motion tracking can be combined with other techniques to add light to a subject's eyes or achieve the final look wanted for a scene, this not only saves time on the set (and money) but, when done in close collaboration with the cinematographer, allows greater flexibility in adjusting the overall feeling of the scene.
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