FILM LIGHT Truelight SDI User manual

Truelight SDI
User Guide

Truelight SDI
Document Reference: FL-TL-UG-0460-SDIUserGuide
Document Version: 1.3
Modified: 22/11/2011 11:57
©FilmLight 2011
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Contents
Truelight SDI User Guide
iii
Contents
Chapter 1 - Introduction 1
About this guide · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 1
Guide conventions · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2
Terminology · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 3
Chapter 2 - Installation 5
Unpacking · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·5
Installing the Truelight SDI hardware · · · · · · · · · · · · · · · · · · · · · · · · · 5
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Connecting to a network . . . . . . . . . . . . . . . . . . . . . . 7
Assigning a static IP address . . . . . . . . . . . . . . . . . . . . . 8
Chapter 3 - Configuration 9
Programming the colour cube slots · · · · · · · · · · · · · · · · · · · · · · · · · · 9
Connecting to the Truelight SDI unit . . . . . . . . . . . . . . . . . 9
Downloading cubes to the unit . . . . . . . . . . . . . . . . . . . 11
Removing cubes from the SDI unit . . . . . . . . . . . . . . . . . 11
Creating a gamut alarm cube . . . . . . . . . . . . . . . . . . . . 12
Testing cubes prior to download . . . . . . . . . . . . . . . . . . 12
Setting the hardware modes · · · · · · · · · · · · · · · · · · · · · · · · · · · · 13
Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Legalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Panel Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Using the built-in test patterns · · · · · · · · · · · · · · · · · · · · · · · · · · · 15
Using the cursor . . . . . . . . . . . . . . . . . . . . . . . . . 16

Contents
Truelight SDI User Guide
iv
Chapter 4 - Operation 17
Front panel · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·17
Selecting cubes . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Bypass mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Legalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Information display . . . . . . . . . . . . . . . . . . . . . . . . 19
Remote control · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·19
Connecting to the unit . . . . . . . . . . . . . . . . . . . . . . . 19
Stopping the remote control . . . . . . . . . . . . . . . . . . . . 22
Backing up the cubes · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·23
The Truelight root . . . . . . . . . . . . . . . . . . . . . . . . . 23
Performing a backup . . . . . . . . . . . . . . . . . . . . . . . 23
Editing backed up cubes . . . . . . . . . . . . . . . . . . . . . . 24
Checking the cubes . . . . . . . . . . . . . . . . . . . . . . . . 24
Chapter 5 - Troubleshooting 25
FAQs · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·25
Support contacts · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·26
Support email . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Appendix A - Specifications 27
Truelight SDI unit specifications · · · · · · · · · · · · · · · · · · · · · · · · · · ·27
Index 29

Chapter 1 – Introduction
About this guide
Truelight SDI User Guide
1
1 - Introduction
Truelight is a complete colour management system for pre-visualising film and HD images
on electronic display devices, working equally well with digital projectors and computer
monitors. It provides a full simulation of the entire workflow from digital data to the final
projected image. By carefully measuring and characterising each stage in the workflow,
the closest possible match between preview and final image can be achieved, allowing
artists, colourists, supervisors and directors to check the final look at any point in the
digital post-production process.
About this guide
This guide contains installation, configuration and operation instructions for the Truelight
SDI unit. It also contains a guide to preparing and loading colour cubes onto the unit.
Troubleshooting help can be found in the FAQs section of this guide.

Chapter 1 – Introduction
Guide conventions
Truelight SDI User Guide
2
Guide conventions
Within this guide, references to user interface items such as menus, on-screen buttons and
keyboard shortcuts are shown in the following way:
Convention Description
Bold Menu selections and UI buttons are shown in bold text:
Scene > Close indicates the ‘Close’ option under the ‘Scene’ menu. Open means the
‘Open’ button.
Keyboard keystrokes are shown in bold within angle brackets:
<F2> means press the ‘F2’ key on the keyboard.
The function of some keystrokes can be modified using a modifier key:
<Ctrl><A> means hold down the ‘Ctrl’ key and press ‘A’.
The other modifier keys are <Shift> and <Alt>. Modifier keys may also be used in
combination:
<Ctrl><Shift><A> means hold down both ‘Ctrl’ and ‘Shift’ and press ‘A’.
Italics Cross-references, directory paths, filenames and application names are shown in italics.
Fixed width Text that appears on the command line or in a shell, or that you need to type, appears in
a fixed width font:
‘Run the command ls <Enter>’ means type ls on the command line and press the
<Enter> key on the keyboard.
Blue text Hyperlinks and email addresses are shown in blue.
1, 2, 3... Operational steps are numbered sequentially (1, 2, 3...) to guide you through the process.
Lines that start with an arrow () describe any notable outcomes of the preceding step.
Indicates a warning or an important note.
Indicates useful information.



Chapter 1 – Introduction
Terminology
Truelight SDI User Guide
3
Terminology
The following is a brief explanation of some key terms used in this guide.
Term Description
LUT Look-up table.
The look-up table is used for mathematical transforms where the range of values that
need to be operated on is limited. In these cases, you can precompute the transform for
all possible input values and store the solutions in a table, where they can be accessed
quickly when the transform is required. You can also use a LUT for transforms that
cannot be easily described or modelled by a formula—in this case the table may be the
data itself, or the data resampled in some way.
When the number of possible input values is too large to store the solution for every
input, the table may contain the solutions to a subsampled input space. In this case, the
solution for a value that is not included in the table is approximated by interpolating
between nearby values.
When a solution depends on only one input value, the transform or function is referred
to as one-dimensional, and the LUT is called a 1D LUT. In digital colour management,
transforms generally depend on all three primary colours, so a 3D LUT is often used.
Since extra dimensions increase the total number of input value combinations
substantially, practical 3D LUTS always subsample the input space, often on a regular
cubic lattice. In colour management, 3D LUTs are sometimes referred to as cubes.

Chapter 1 – Introduction
Terminology
Truelight SDI User Guide
4
Truelight cube When Truelight applies a transform to an input colour (three values), it can apply a 1D
LUT (one for each input channel) followed by a 3D LUT, both regularly sampled. This two-
step rendering process allows for accurate interpolation without needing excessive
sample points in the 3D LUT. The number of samples for both the 1D and 3D LUTs is
specified within the Truelight profile (see below) from which it was generated, though
some Truelight rendering systems (like the Truelight SDI unit) may impose their own
restrictions. You can omit either of the 1D or 3D LUTs.
This combination of LUTs is referred to as a Truelight cube. It is usually generated from a
Truelight profile when required and so there is generally no need for a corresponding file
format. However, third parties that want to make use of the Truelight rendering engine
can use the Truelight text file format specification to input the LUT values directly (as
described in the Truelight Cube Format document). Also, when a profile is selected for
loading onto Truelight hardware (like the Truelight SDI unit) it is communicated to and
stored on the unit as a cube.
Since the Truelight cube is more general than most other colour transform LUT formats
(the majority of which are just 3D LUTs) Truelight can reinterpret third-party LUT files
into Truelight cubes for direct use in the rendering engine.
Truelight profile A Truelight profile is a collection of special instructions and, usually, empirical data which
gets ‘compiled’ into a Truelight cube at the time it is used.
A typical example of a Truelight profile is a description of how to emulate a film output
process and projection on a particular digital projector—raw measurements of the film
processes and the projector are included in the profile file together with other
parameters such as those relating to the viewing environment (like flare).
This file is widely used as means of communicating the viewing intention of certain
images from one FilmLight system to another. By sending the profile, rather than the
cube generated from it, the end viewer can easily replace the data relating to the
projector with a calibration of their own display system, thereby ensuring that the view
of the images is the same despite using a different display system.
Term Description

Chapter 2 – Installation
Unpacking
Truelight SDI User Guide
5
2 - Installation
Unpacking
Take care when handling fragile items such as the Truelight SDI hardware unit. Any
shipping damage should be immediately notified to your FilmLight representative. Check
that you have been supplied with the following items, and notify your supplier
immediately of any omissions.
Before installing the system, make a note of the Truelight unit's MAC address and the
current version of installed firmware and operating system—these can be found on a label
attached to the unit or on the accompanying paperwork. If you cannot find these details
then you can get them from the unit using a utility program (see page 25 for details).
If you want to load colour cubes onto the unit, you will also need an Intel Mac or Linux
computer with the Truelight application installed on it; this machine is not supplied.
Installing the Truelight SDI hardware
The Truelight SDI hardware consists of a 1U rack-mountable unit. It should be bolted into
a standard 19” rack using appropriate screws and allowing sufficient space above to
provide adequate ventilation.
Power is supplied from the included 5V power supply and its lead via a standard 2.1mm
power connector. Note that the polarity of this connector is centre pin positive.
Item Description
Truelight SDI Unit 1U 19” rackmount
Power supply 100-240V input (via IEC cable), 5V DC output
Mains cable IEC mains cable
Documentation Printed version of this guide
Note that to create or load custom cubes, you will also need an appropriate Truelight
license installed on this system. Contact Truelight Support for assistance
([email protected]).

The power supply must be connected to the mains via a standard IEC lead. Check the
rated input of the power supply before connecting it to your mains power. Note that
the Truelight SDI unit and power supply are designed for continuous operation,
therefore a power switch is not included in the design.
Do not use any other power supply with the Truelight SDI unit.


Chapter 2 – Installation
Installing the Truelight SDI hardware
Truelight SDI User Guide
6
Connectors Cables are connected to the unit according to the diagram below:
Note that certain functions, such as cube selection, can also be performed locally using the
buttons on the front of the unit; the remote control connection is only required for full
operation of the unit—see Remote control on page 19.
Figure 2-1: Truelight SDI cable connections
– Input (SDI)
The SDI connections support both standard (single-link) SDI and dual-link SDI
signals. For single-link input, use either the IN A or the IN B connector. Use both
the IN A and IN B connectors for dual-link input.
Connect these ports to the SDI OUT ports on your video device.
– Monitoring outputs (SDI)
The SDI connections support both standard (single-link) SDI and dual-link SDI
signals. For single-link output, use either the OUT A or the OUT B connector. Use
both the OUT A and OUT B connectors for dual-link input.
Connect these ports to the SDI IN ports on your display device.
– Ethernet connection
The ethernet port allows Truelight SDI to be controlled over a standard
10/100BaseT network. This connection provides full control over the unit. It
should be connected directly to the software host, or to an appropriate hub or
switch within your network.
– Truelight software host (optional)
The SERIAL 2 connector can be used to connect to the Mac or Linux system on
which the Truelight software is installed. Note that this system is usually accessed
over the ethernet connection.
– Power connector.
Note that the USB and Serial 1 connectors are reserved for factory setup. These
connections are not required for normal operation.


Chapter 2 – Installation
Installing the Truelight SDI hardware
Truelight SDI User Guide
7
Connecting to a
network
An ethernet connection is provided to connect the Truelight SDI unit to a network. In a
typical setup the connection would be made via a switch or hub, but it is also possible to
make a direct connection to the Truelight software host. During its bootup phase the SDI
unit normally tries to obtain an IP address from a DHCP server on the network—you should
ensure that the unit can access a DHCP server over the network the first time that the unit
boots up. Once the unit has booted with a DHCP-assigned IP address, it is then possible to
assign a static IP to it if nessary—see the section on Assigning a static IP address below.
When the unit boots up, it displays its IP address on the LCD for a few seconds. However,
if it is set to obtain an IP address via DHCP, the first time the unit is powered up on a
network it does not initially have an IP address. This this should be obtained automatically
after a few seconds from the DHCP server. As long as the network connection stays intact
(that is, the unit is connected via a hub or switch, and the network cables are not
unplugged) then it normally retains this IP address—most DHCP servers supply the same
IP address for a specific client within a certain time window. It should be possible,
therefore, to reboot the unit once it has an IP address. This can be done by removing the
5V power supply plug from the back of the unit and then plugging it in again. Once the
reboot is complete, the IP address should appear in the LCD for a few seconds. Note that
if the DHCP server is restarted for any reason, then the assigned IP address may change.
If the unit has been set up with a static IP address, this should always be displayed in the
LCD for a few seconds after it has booted.

Chapter 2 – Installation
Installing the Truelight SDI hardware
Truelight SDI User Guide
8
Assigning a static
IP address
From firmware version 2.9 onwards it is possible to configure the unit with a static IP
address (earlier versions of firmware only support dynamic IP addresses via DHCP).
To assign a static IP address:
1Connect to the unit with telnet (to the current, DHCP-allocated IP address) via
ethernet.
Note that you need to log in with the username root and the password tini.
2Assuming the release version is 2.9 or greater then you can set a fixed IP address
using the ipconfig command as follows:
ipconfig -r -a 192.168.1.123 -m 255.255.255.0 <Enter>
where -r first releases the DHCP assigned address, -a then sets the IP address and -m
sets the netmask.
You will then see a message similar to the following:
Warning: This will disconnect any connected network users
and reset all network servers.
OK to proceed? (Y/N): y
Type yto continue:
Message from System: DHCP IP lost.
3Check the IP settings by connecting to the new address with telnet. The assigned
address should now be static and should be retained after a reboot or power cycle.
Check this by removing and restoring power to the unit—the IP address should
appear briefly on the LCD.
In order to assign a static IP address to the unit, it must have been assigned an address
via a DHCP server the first time that it booted up.
Note that the current IP address can also be obtained by connecting the unit to the
Truelight software host via serial port 2 and running the Truelight application. Once
connected, the IP address is read via the serial link and automatically displayed in the
Hardware panel in the Truelight application (see Connecting to the Truelight SDI unit on
page 9 for details).



Chapter 3 – Configuration
Programming the colour cube slots
Truelight SDI User Guide
9
3 - Configuration
Before the Truelight SDI unit can be used to emulate specific film-outs, it must be loaded
with an appropriate set of colour cubes for your workflow(s). Cubes can be loaded onto
the unit from the Truelight software host either via an ethernet link or a direct serial
connection to the box.
Programming the colour cube slots
The following procedures assume that you have already calibrated your display device and
have created the required Truelight profiles. Full details of display calibration can be found
in the guide, Calibrating your display with Truelight.
The Truelight SDI box contains 15 cube slots that must be programmed from a Mac or Linux
system running the Truelight software. Note that in order to create custom cubes using
Truelight, or load custom cubes created in another system to the Truelight SDI unit, an
appropriate license must be installed on this machine.
Connecting to the
Truelight SDI unit
To connect to the Truelight SDI unit:
1The Truelight SDI unit can be connected to the Truelight software host either via an
ethernet connection or by connecting a serial cable to the Serial 2 connection on the
Truelight SDI unit.
If you are using the ethernet connection then both the Truelight software host and
Truelight SDI unit must be on the same network. See Connecting to a network on
page 7 for details.
2Run the Truelight application:
•Mac: Go to Applications > Truelight > Current and double-click truelight.
•Linux: Double-click the Truelight icon on the desktop:
Note that if this icon is missing, then you can run the application from a terminal
window. Type the following command on the command line:
truelight <Enter>
If your machine does not have a serial port then it is possible to connect to the Truelight
SDI unit serial input via a USB-to-serial adapter. Contact Truelight Support for details of
suitable adapters.


Chapter 3 – Configuration
Programming the colour cube slots
Truelight SDI User Guide
10
3Select the Hardware panel.
This provides various controls for the hardware and details about its current
settings. If this panel is not displayed, select Layout > Hardware from the main
menu or press <Ctrl><I> on the keyboard.
4In the Connect section, select an option from the Hardware port list: either
ethernet, or the serial port or USB port that the Truelight software host is connected
to. Note that if you want to connect via USB, you must use a serial-to-USB adapter.
If you select the serial or USB connection and the unit also has a valid ethernet
connection, then the current IP address is automatically entered in the Name or IP
address field—this is a useful way to find out the current IP address of the unit.
Once the port has been selected the application attempts to connect to the Truelight
SDI unit.
If you select Ethernet, then the correct IP address must be entered into the Name or
IP address field (this may have been automatically filled in with data read over a
serial connection—see above). Press <Enter>.
If it fails to connect, check that the cables are plugged in correctly. If you are using
the ethernet connection, check that you can 'ping' the box—see Section 5 -
Troubleshooting for help.
5The current box settings and all cube names are automatically read and displayed in
the Hardware panel.
Figure 3-1: Connect options

Chapter 3 – Configuration
Programming the colour cube slots
Truelight SDI User Guide
11
Downloading
cubes to the unit
The Truelight SDI unit can be loaded with pre-built cubes, or you can use Truelight profiles
to generate cubes. Truelight converts a profile into a cube when you load it into the
selected slot in the hardware unit.
To generate and download cubes:
1Open the first profile you want to load into the Truelight SDI unit by selecting
Profile > Open Profile or Cube or pressing <Ctrl><P> on the keyboard.
At this stage, adjustments can be made to the profile if necessary.
2On the Hardware panel, select the appropriate hardware cube slot from the list in
the Cube Transform section:
Note that the Current display option is not actually a slot in the Truelight SDI unit—
it copies the cube directly into the 'live cube' memory within the unit. The output of
the unit therefore shows the effect of the downloaded cube without it having been
written to a slot. This is useful when making repetitive adjustments; however,
remember to commit the cube to a slot once it has been finalised.
3To download the cube to the selected slot, click Load [profile] cube, where profile is
the name of the currently selected profile in the Truelight application. If the slot is
not empty you are asked if you want to overwrite the cube in that slot.
The binary data for the cube is then transferred to the Truelight SDI unit.
4Repeat this procedure for each of the slots that you want to (re)program.
Removing cubes
from the SDI unit
If you want to delete any of the cubes from the Truelight SDI unit, select the appropriate
slot from the list in the Cube Transform section, and then click Delete cube.
If you want to check that you are loading the correct profiles, you can open a test
image—from the main menu, select Image > Open (or press <Ctrl><O>) and then find
an appropriate image to open.
Figure 3-2: Cube Transform options
If you are using a profile to generate a cube, the current profile is loaded onto the unit
even if it has unsaved changes. To make sure that your local copy of the profile matches
the copy on the unit, you should save the profile before downloading it.



Chapter 3 – Configuration
Programming the colour cube slots
Truelight SDI User Guide
12
Creating a gamut
alarm cube
The cubes in the Truelight SDI unit are arranged in pairs—the second cube in a pair is often
a gamut alarm version of the first (see Selecting cubes on page 17). Gamut alarm cubes are
generated from a profile just like other cubes in the SDI unit.
To create a gamut alarm version of a cube:
1First load the profile for the normal cube into the Truelight application by selecting
Profile > Open > [profile].
2Select the View tab.
3From the Gamut Alarm list, select the type of gamut alarm that you would like to
create. The options are:
•Classic: Shows the colours in the original image that cannot be reproduced on the
display. All other colours are shown as greys.
•Map: Highlights the colours in the original image that cannot be reproduced on the
display. Colours that underflow are marked as red; colours that overflow are marked
as green; colours that underflow in one channel but overflow in another are marked
as blue. All other colours are shown as greys. The Map option is better than Classic
at showing up problems in blacks and whites.
Make sure that you do not touch any of the other controls.
4Save the profile (Profile > Save As...) and edit the name so that it includes the word
'gamut' or 'alarm' (for example).
5Click OK.
6Download the cube to the Truelight SDI unit following the instructions on page 9.
Testing cubes prior
to download
Before committing a cube into one of the slots in the SDI unit, it is possible to preview it.
To do this:
1Select the Current display option from the top of the Cube Transform list in the
Hardware panel.
2Click on Load [profile] cube.
This updates the output of the SDI unit directly without overwriting any of the slots.
It is therefore possible to experiment with different profile settings (for example, to
interactively match a test image on the monitor to a reference image) before
committing the cube to the box.

Chapter 3 – Configuration
Setting the hardware modes
Truelight SDI User Guide
13
Setting the hardware modes
The Hardware modes section on the Hardware panel sets up the input and output video
modes and provides control over other functions of the unit.
Select the Input list to set the input mode:
Select the Output list to set the output mode:
Note that these settings apply globally to all cubes. Therefore, to correctly configure the
unit it is necessary to know the creation mode of the cube (RGB/YCrCb) and whether it was
generated with scaling enabled or disabled. If you have cubes installed that were created
in different modes then it is recommended to include an appropriate reference (for
example ‘RGB-Scaled’ or ‘YCrCb-Unscaled’) as part of the file name for the profile used to
generate the cube.
Figure 3-3: Hardware modes
Mode Description
422A The input mode is set to 4:2:2 (YCrCb) and the signal is taken from the IN A connector.
422B The input mode is set to 4:2:2 (YCrCb) and the signal is taken from the IN B connector.
444 YUV The input mode is set to 4:4:4 YCrCb (this requires a dual-link input to both IN A and IN B
connectors).
444 RGB The input mode is set to 4:4:4 RGB (this requires a dual-link input to both IN A and IN B
connectors).
Mode Description
422 The output mode is set to 4:2:2 (YCrCb) and the same signal is available on both the OUT
A and OUT B connectors.
444 YUV The output mode is set to 4:4:4 YCrCb (this feeds a dual-link output via the OUT A and
OUT B connectors).
444 RGB The output mode is set to 4:4:4 RGB (this feeds a dual-link output via the OUT A and OUT
B connectors).

Chapter 3 – Configuration
Setting the hardware modes
Truelight SDI User Guide
14
Bypass This toggle button puts the unit into bypass mode. This function can also be controlled
from the front panel or via the Java remote control—see Bypass mode on page 18.
Legalizer This toggle button controls the video legalizer. This function can also be controlled from
the front panel or via the Java remote control—see Legalizer on page 18.
Scaling This toggle button turns the scaling function on or off. This function can also be controlled
via the Java remote control—see Remote control on page 19.
Panel Lock This toggle button locks the front panel buttons preventing local operation. This function
can also be controlled via the Java remote control.

Chapter 3 – Configuration
Using the built-in test patterns
Truelight SDI User Guide
15
Using the built-in test patterns
The Test patterns list allows you to enable the test signal generator. When test signals are
enabled, they replace the input to the unit but retain the same sync. As the test signal
generator operates upstream of the colour cube processor, all test signals are displayed
through the currently selected cube.
The following signals can be generated by selecting the appropriate item from the list:
* The colour generated is defined by the values entered into the Red, Green,
and Blue data entry fields on the Test patterns panel.
Figure 3-4: Test patterns
Signal Description
Red ramp Full amplitude ramp in the red channel only.
Green ramp Full amplitude ramp in the green channel only.
Blue ramp Full amplitude ramp in the blue channel only.
White ramp Full amplitude ramp in the red, green and blue channels.
Colours Full field, full gamut colour pattern.
Full field colour* Full field of the colour defined by the values in the Red, Green and Blue boxes in the test
signals panel.
Colour bars Colour bars across the screen.
Pluge Pluge pattern used to set up the monitor black level control.
8 step grey Linear grey steps across the screen.
21 step grey Linear grey steps across the screen.
White crosshair on black A single-pixel wide horizontal and vertical white line on a black background.
Black crosshair on white A single-pixel wide horizontal and vertical black line on a white background.
Colour stripe* A stripe across the middle of the screen is filled with the colour defined by the values in
the Red, Green and Blue boxes in the test signals panel. The other half is black.

Chapter 3 – Configuration
Using the built-in test patterns
Truelight SDI User Guide
16
Using the cursor As a diagnostic aid, a cross-hair cursor can be superimposed over the output image from
the unit.
The cursor can be switched on using the Enable button. When enabled, the RGB values for
the pixel at the centre of the cursor are displayed for both the input to the cube and its
output—that is, the pre- and post-transform values are both shown.
Note that these values are 10-bit numbers (reported to 8-bit precision) read after any
input scaling and before any output video scaling.
By adjusting the Xand Ysliders, any pixel within the active picture area can be selected.
Figure 3-5: Cursor options