Apple MA434Z/A User Manual - Page 611

Color Correction 23 23 Shake's color-correction and pixel-analyzer functions provide many ways of analyzing and manipulating the color values of your images. Bit Depth, Color Space, and Color Correction By default, Shake works with a color range of 0 to 1 in RGB linear space. Shake allows you to work at different bit depths, so 0 is considered black and 1 is considered white. Ordinarily, values above 1 and below 0 are clamped (constrained to a value between 1 and 0) as they're passed from node to node down the tree of image-processing functions. This can have a profound effect on the resulting image processing in your script, with the following caveats: • Nodes that concatenate are not subject to this clamping. • Clamping does not occur when you work in float bit depth, because 32-bit (float) computations preserve values above 1 and below 0. Working in Different Color Spaces When working with logarithmic Cineon plates, apply a LogLin node to avoid unpredictable results. The LogLin node allows you to jump from logarithmic to linear space, or linear to logarithmic space. For more information, see "The Logarithmic Cineon File" on page 437. To apply an effect such as a Blur node in a different color space (for example, to blur the color difference channels in a YUV image, but not the luminance), apply a ColorSpace node to the image to convert it to the different color space. Then, add the effect node-in this example, the Blur node. To return to your original color space, add another ColorSpace node. 611