BCC 3 Way Color Grade

Transcription

1 BCC 3 Way Color Grade The 3 Way Color Grade filter enables you to color correct an input image using industry standard Lift- Gamma- Gain controls with an intuitive color sphere and slider interface. The filter includes a built- in keying option for isolating secondary colors from the primaries and power window style masking (with 2 point motion tracking), which allow you to isolate or selectively apply the color correction to specific region of the image. Independent color correction adjustments can be applied to points inside and outside of the key- mask selection within a single instance of the filter. Compare controls, located at the top of the filter, let you compare the input and processed image, or two independent color correction settings applied to the image. All internal processing in this filter is done in 32 bit floating point for maximum precision, thereby eliminating any round- off errors. This allows you to combine extreme settings of the different controls without introducing banding on the image output.

2 Parameter descriptions: Compare Group: This controls the output that is rendered by the filter.

3 Compare Mode pop- up: Controls what is displayed by the Compare Mode. The options are: Off: Shows the output of the filter. Wipe: Enables the user to interactively wipe the effect across the image. The left side of the wipe bar on the image output shows the unfiltered image, while the right side of the wipe bar shows the filtered result. When in Wipe mode, the corresponding Wipe slider becomes available. Side By Side: The left side of the output shows half of the incoming image, and the right side shows the same half of the image as processed by the filter. When in Side- By- Side mode, the corresponding Slide and Right Offset sliders become available. Wipe/Slide: Operates as a Wipe function when Wipe is selected in Compare Mode, and as a Slide function when Side- By- Side is selected in Compare Mode. When in Wipe mode, adjustments to this parameter moves the vertical wipe bar across the image; the region on the left of the wipe bar shows the original unfiltered image, while the region on the right shows the filtered result. When in Slide mode, adjustments to this parameter pans the image in the viewer window, maintaining the spatial relationship in the viewer between the before and after images. Right Offset: Provides a way to adjust the spatial relationship between the unfiltered original image and the filtered result in the viewer window. Adjustments to this parameter will offset the position of the filtered image in the viewer. Opaque Source checkbox - Used to instruct the filter to process or ignore the alpha channel in the input clip. Engaging this function can provide a performance boost. Enabled - The alpha channel is ignored by the filter Disabled - The alpha channel is processed by the filter Saturation Mode pop- up: Used to set the color space or gamut in which the filter will perform changes to the saturation of the input clip, instructing the filter to process particular luma values in one of four separate ways when increasing or decreasing the Saturation of the input. HSV - Hue, Saturation, Luminance HSL - Hue, Saturation, Value HSI - Hue, Saturation, Interpreted HSP - Hue, Saturation, Perceptual Hint: Setting the Saturation Mode to HSP provides the greatest tonal range when generating black and white images.

4 Inside Preset pop- up selector - Used to store and or retrieve color settings that affect the region inside the masked or keyed region of the input. The settings in this group affect the 3 Color Wheel values, as well as the Exposure and Saturation parameter values Inside Lift/Gamma/Gain group - Contains animatable Lift/Gamma/Gain interactive color spheres and luma controls. Note that while each of the three groups to some degree affects the entire image, the Lift controls are best suited for tuning the dark areas of the image, the Gamma controls for the mid- tones, and the Gain controls for the light areas. Located in the top left corner of the group is a switch labeled 11/3. This toggle switch enables you to change the origin or position of the color spheres to match that of a vector scope (where red is at approximately 11 o clock) or that of a graphics application (where red is located at 3 o clock).

5 Each color sphere has a control point that is used to adjust hue and saturation. The control point can be moved by interactively dragging it across the color sphere or by moving the cursor over the desired position on the sphere and clicking with the mouse / pen. Beneath each color sphere is a pair of sliders that are used to adjust Luma values. The upper slider is used to make large adjustments to luma values, while the lower (dashed) slider is used to fine- tune the amount of Luma adjustment. To enable animation for the controls in this group, click on the stopwatch function beside the group name. Once a keyframe has been added, you can add another by moving the CTI to another location on the timeline and changing any ball or slider setting. Each of the color control spheres and the luma control sliders has an on/off switch and a reset switch. The on/off switch behaves like a checkbox toggle control the reset switch resets the color sphere or luma sliders to their default neutral position. Lift / Gamma / Gain Color Spheres - Used to adjust the hue and saturation values of the input clip. Lift / Gamma / Gain Luma Sliders - Used to adjust the luma values of the input clip. On Switches Used to enable or disable the color (hue and saturation) or luma adjustment individually for Lift, Gamma and Gain. R Switches Used to reset the color sphere or luma sliders individually for Lift, Gamma or Gain to the default neutral position. The image below shows the color spheres in the filters user interface as you can see, the position of the color spheres can be set to match that of a vector scope or that of a typical graphics / compositing application. Exposure slider - Lightens or darkens the image by the number of f- stops set in the slider. You can use this control to globally lighten or darken an image. The internal floating point image processing allows you to do this without introducing banding in the image result. Saturation slider - Allows you to boost or cut the saturation of the image, with positive values increasing the saturation of the image input and negative values decreasing the saturation. A value of will produce a pure black and white

6 result. The precise effect of the saturation adjustment is determined by the Saturation Mode pop- up setting. Hint: Setting the Saturation Mode to HSP provides the greatest tonal range when generating black and white images. Render mode pop- up - This popup interacts with the Mask and Key controls and determines the rendered output of the filter. The Mask and Key controls can be used to create a matte that separates the image into Inside and Outside pixels.. The following options are available in this pop- up: Render with Matte - Uses the inside settings to render pixels inside the matte (pixels that are both inside the mask and keyed in), and the outside settings to render pixels that are outside the matte. Render Inside Matte Only - Uses the inside settings to render pixels inside the matte, and leaves pixels outside the matte unchanged. Render Outside Matte Only - Uses the outside settings to render pixels outside the matte, and leaves pixels inside the matte unchanged. Use Inside Correction - The matte is ignored, and the inside correction is applied to the entire image. Use Outside Correction - The matte is ignored, and the outside correction is applied to the entire image. View Matte - The Matte is rendered as a black and white image. Mask Inside Pixels - The source is rendered with a ruby mask over the pixels that are inside the matte. Mask Outside Pixels - The source is rendered with a ruby mask over the pixels that are outside the matte. Make Alpha from Matte - Makes an alpha channel from the matte. This is composited with the image's original alpha channel. Make Alpha from Inverse Matte - Makes an alpha channel from the inverted matte. This is composited with the image's original alpha channel. Show Source - Displays the unfiltered and unmasked original input clip. Matte Preview Color picker Used to set the color of the mask overlay Mask Shape pop- up Used to select the shape of the mask that is used to contain the inside and outside color correction. On- screen control widgets have been provided for the Rectangle, Rounded Rectangle and Egg Shape masks. The available on- screen controls for these mask shapes enable you to modify the position and scale of the mask as well as the feather amount, and feather bias. For the Egg Shape mask, an additional on- screen widget enables you to control the egg shape without taking your eyes off the image. Off No mask is used and only the Inside Color Correction parameters will affect the image result. Rectangle Generates a rectangular mask Rounded Rectangle - Generates a rectangular mask Egg Shape - Generates an egg shape mask (good for human faces) Host Layer Uses luma values from the host layer Host Mask Uses AE native mask shape

7 Note: If you select Host Layer or Host Mask, you must then proceed to the Mask Group to select a layer from the timeline or any single closed- spline AE mask shape. You will also need to go to the Mask group to modify any of the internally generated mask shape parameters. Mask group Contains parameters pertaining to the mask that is used to separate the inside and outside color grade. Host Layer pop-up Displays a list all of the available layers in the host timeline. Host Channel pop-up used to select the host layer luma or alpha channel or their inverts. Luma Uses the selected host layer Luma channel. Alpha - Uses the selected host layer Alpha channel. Luma Inv - Uses the selected host layer Inverted Luma channel. Alpha Inv - Uses the selected host layer Inverted Alpha channel. Host Mask pop-up Displays a list of available host generated closed spline mask shapes. Host Mask Offset Used to offset the position of the selected host mask shape. Point 1 Used to control the position of the top of the mask shape. Point 2 Used to control the position of the bottom of the mask shape. Width Used to control the width of the mask shape. Scale Used to transform scale the mask shape. Egg Shape Used to control the mask egg shape. Negative values produce a downward pointing egg shape, positive values produce an upward pointing egg shape. Feather Used to control the softness (feather) of the mask edge. Feather Bias Used to position the feather inside or outside of the mask shape bounds. Mask Gamma - Used to adjust the falloff of the mask feathering. Invert - Used to invert the mask.

8 Enable Overlays checkbox - Used to enable or disable the drawing of the on- screen control widgets. Key Mode pop- up Controls the state of the key matte function. Off Key matte function is disabled. On Enables the key matte function. Invert inverts the generated key matte. Mask Key Combine pop- up contains options for combining the mask shape and the key matte. Multiply Multiplies the key matte with the mask shape (removes pixels from the mask). Screen Screens the key matte over the mask shape (adds pixels to the mask). Key Group Contains parameters that are used in the generation of key mattes to isolate secondary colors for color adjustment. Base Key On pop- up Used to set the color space in which the keying is done. HSV - Hue, Saturation, Luminance. HSL - Hue, Saturation, Value. HSI - Hue, Saturation, Interpreted. HSP - Hue, Saturation, Perceptual. Hint: Setting the Base Key On pop- up to HSP provides the greatest tonal range of all the available options but it less bright than the HSL default.

9 key. Key Softness pop-up Controls how the softness controls interact with the Expand Key Increasing the softness controls expand the key when this is selected. Contract Key Increasing the softness controls contract the key when this is selected Soften Key Increasing the softness controls softens the key when this is selected. Key Color swatch and eyedropper Used to select a color from the image that will be matched in the selected color space. Note: If you choose a pure grey no hue matching will be done. Hue Threshold Used to control how close each pixels hue value needs to be to the selected Key Color to be treated as within the key. Hue Softness Used to soften the key in the hue channel. Sat. Threshold - Used to control how close each pixels saturation value needs to be to the selected Key Color to be treated as within the key. Sat. Softness - Used to soften the key in the saturation channel. Lightness Threshold - Used to control how close each pixels lightness value needs to be to the selected Key Color to be treated as within the key. Lightness Softness - Used to soften the key in the lightness channel. Blur Key Used to apply a blur to the key. Note: Use the Blur Key function with caution it adds about 50 percent to the render time. Outside Correction group This group contains a second set of color correction controls which are identical to the Inside Lift/Gamma/Gain and Exposure / Saturation functions at the top of the filter. This group of controls only effects regions that are outside of the key and / or mask and is disabled unless a live key or mask is present and seen by the filter. The parameters in this group are explained in the Left/Gamma/Gain group at the top of this document. Note: Presets can be shared between the inside and the outside color correction groups. Mix with Original - Mixes back the original image with the filtered result as in other BCC filters. Motion Tracker This filter has two motion trackers, one each for controlling the two points that determine the shape of the mask. For detailed notes on use of the BCC Motion Tracker, please click on the help button at the top of the motion tracker parameter group. The trackers in this filter have some additional controls: Apply has three choices.

10 Off ignores the tracker data Mask Points applies each tracker to the corresponding mask points Host Mask Offset applies data from Tracker 1 to the host mask. Lock Tracker 1 and 2 lock each tracker. If you have successfully tracked one point, and are still working on the other, you can lock the completed tracker to save time and avoid changing its data. Each tracker has a group for controls that can be set independently for the trackers. You would normally set tracker 1 to the point at the start of your clip where you want Point 1 of the mask to be, and tracker 2 where you want Point 2. You would then track and set Apply to Mask Points There will be times when the points that you are able to track do not correspond to the end points of the desired mask. There are two ways that you can deal with this. You can attempt to adjust the mask controls (e.g. Feather, Feather Bias, and Scale) to find settings that produce the desired result, or you can edit the Offset X and Offset Y controls for each point to offset the Mask Points from the tracked result. These offset controls can be animated if needed.