MOTU HDX-SDI User's Guide download pdf (Page 39)

MOTU VIDEO SETUP

Color lookup table (CLUT)

In the Color Lookup Table (CLUT) section

(Figure 6-8), there are ten parameters which deﬁne

a color transfer function, as deﬁned by the

American Society of Cinematographers Color

Decision List (ASC CDL) speciﬁcation.

The CLUT controls in the Playback tab

(Figure 6-8) deﬁne a transfer function which

applies to the output on playback. The controls in

the Preview pane (Figure 6-10) deﬁne a transfer

function which applies to the input on capture. In

this case, it affects pass through as well as capture.

The power switch icon (Figure 6-9) is an enable/

bypass control. Click it to turn the CLUT on or off.

Figure 6-9: Color lookup table controls.

The Reset button resets the transfer function to its

default, which passes through each pixel

unchanged, and also switches to bypass mode.

Changing any control automatically enables the

transfer function, but you can also toggle between

Enabled and Bypassed by clicking on the enable/

bypass control.

The Sat parameter is ASC CDL Saturation. A value

of 1.0 passes each pixel through unchanged. Values

below 1.0 will desaturate, with 0.0 resulting in a

monochrome image. Values greater than 1.0

increases saturation. The maximum legal value is

10.0, which produces extreme results.

The Slope, Offset, and Power parameters for each

component deﬁne a transfer function for that

component, as per the ASC CDL speciﬁcation.

Offset ranges from -1 to +1, with a default of 0.

Power and Slope range from 0.10 to 10.00, with a

default of 1.0.

Each of the numeric controls may be modiﬁed in

three ways:

■ If the console window is in front, click on a

control to select it, and type a new value

■ Click and drag up or down

■ Use the mouse wheel

The latter two methods will work even if the

window is not in front (which is useful for

adjusting playback controls, because it can be done

while another application such as Final Cut

remains the front-most application).

The capture color correction controls (in the

Preview tab) only appear over the preview when

the mouse is over the preview. The panel holding

the capture color correction controls can be

dragged around within the preview pane, allowing

you to see any part of the preview while adjusting

the controls. To drag it, click on any part of the

panel other than one of the buttons or numeric

controls.

Enable/disable CLUT

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MOTU HDX-SDI User's Guide Page 39

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