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The Basics, Part 11About this TutorialThis tutorial is designed to give you a general overview of how Chalice works. You willbe introduced to the workspace, nodes, and other basic elements of the interface.You will learn how to view images and how to connect nodes into a dataflow networkto create a shot.Specifically, you will learn how to load images into Chalice, increase the brightness ofan image, and save the image out to disk.You will need the following image file for this tutorial: “stars.rgb.” If you do not havethis image, refer to “Where to find the tutorial files” in the Introduction.ObjectivesLoad an image into ChaliceView and brighten the imageRender the imageNodes UsedDisk InputBrightnessDisk OutputExecStep A: Become Familiar with the Chalice InterfaceThe first thing you will see when you launch Chalice is the Chalice Screen Layout. It iscomposed of several main parts:No.1: The Basics, Pt.1T1.1Chalice TutorialsThe Chalice menu bars run across the top of the screen. MThe ain Menu bar featuresfairly typical menus such as File, Edit, and Preferences, which provide commands andoptions for working with grail files (Chalice work files). The Node Menu bar is usedto select nodes, which represent the operations performed on the imagery.The Workspace is the large area where you build your dataflow network. Once you se lect the type of node you desire from the Node Menu, you place it in the workspaceand connect it to other nodes to form a ...
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Chalice Tutorials
T1.1
No.1: The Basics, Pt.1
The Basics, Part 1
1
About this Tutorial
This tutorial is designed to give you a general overview of how Chalice works. You will
be introduced to the workspace, nodes, and other basic elements of the interface.
You will learn how to view images and how to connect nodes into a dataflow network
to create a shot.
Specifically, you will learn how to load images into Chalice, increase the brightness of
an image, and save the image out to disk.
You will need the following image file for this tutorial: “stars.rgb.” If you do not have
this image, refer to “Where to find the tutorial files” in the Introduction.
Objectives
Load an image into Chalice
View and brighten the image
Render the image
Nodes Used
Disk Input
Brightness
Disk Output
Exec
Step A: Become Familiar with the Chalice Interface
The first thing you will see when you launch Chalice is the Chalice Screen Layout. It is
composed of several main parts:
No.1: The Basics, Pt.1
T1.2
Chalice Tutorials
The Chalice menu bars run across the top of the screen. The
Main Menu bar
features
fairly typical menus such as File, Edit, and Preferences, which provide commands and
options for working with grail files (Chalice work files). The
Node Menu bar
is used
to select nodes, which represent the operations performed on the imagery.
The
Workspace
is the large area where you build your dataflow network. Once you se-
lect the type of node you desire from the Node Menu, you place it in the workspace
and connect it to other nodes to form a network.
The workspace contains all nodes currently in the network; however, for a com-
plex shot the dataflow may be too large to display in its entirety without scrolling.
Click and drag the workspace, use the scroll bars, or click and drag the Radar Map to
navigate through large node networks.
The
Node Panel
area is located at the left side of the Chalice screen and displays pa-
rameter options for whichever node is currently selected. (The node panel area will be
blank until the first node is placed in the workspace.)
The
Local Frame Control Panel
is a frame navigator for the currently active node. It
controls the frame for both the node parameter data and the node monitor display.
The
Radar Map
provides a macroscopic view of the entire grail network. When your
network is larger than the visible workspace, a bounding rectangle appears in the
Radar Map to designate the portion currently visible in the workspace. You can click
and drag this rectangle to center any part of the network in the workspace.
The Radar Map also provides system activity information: the node icons in the map
flash yellow and green to indicate that data is being sent, received, or processed, and a
red node icon indicates an error.
Step B: Create a Disk Input Node and Load an Image
The
Disk Input
node
enables you to load source imagery from your hard disk or from
a remote directory on a shared volume. The Disk Input node is accessed from the
I/O
node menu,
which contains nodes used for input and output operations.
1. Select a Disk Input node from the
I/O
menu and place it in the workspace:
• Pull down the I/O menu and select “Disk Input” from the list of nodes.
• Release the mouse button and then move the mouse into the Workspace.
(A white outline of a box will appear under the cursor.)
• Click anywhere in the Workspace and the Disk Input node will appear.
No.1: The Basics, Pt.1
T1.3
Chalice Tutorials
2. Note that the Disk Input node parameters are now displayed in the Node Panel
area of the interface.
Each node includes a set of parameters. The parameters for the currently selected node
appear on one or more tabbed panels (like a set of file folders) in the Node Panel.
You can display any parameter tab by clicking on a tab icon. The Disk Input node
features parameter tabs named
Disk
,
Swap
,
Dpx
,
Fido
,
YUV
, and
Info
, which
contain parameter controls and information related to the node.
For this tutorial, only the “
Disk
” tab will be used.
3. Go to the Node Panel and click on the
Source (+)
button in the Disk tab.
This will bring up a
Choose File
dialog box,
which will enable you to select an
image file for input.
4. Use one of the navigation options in the dialog box to go to the location where
the tutorial images have been stored.
You can type in the name of the directory you wish to access or click on the direc-
tory entries (
Jump
and
Up
) to navigate through your file system.
If you need more information about using the Choose File dialog, refer to “Im-
porting Image Files” in the Disk Input node description in chapter 9 of the
Chalice User Guide (p. 9.5).
Note:
If you do not have the images provided with these tutorials, refer
to the “Introduction to the Chalice Tutorials” to find out how to
get them.
5. Select the file “
stars.rgb.
”
You can click on the
Accept
button at the bottom of the Choose File dialog, or
simply double-click on the filename. The dialog box will close and the path and
filename of the image will appear in the Source text box of the node panel.
6. Click in the
Frame View
(center) of the Disk Input node to view the icon image
of “stars.rgb.” In a few seconds the image will appear.
No.1: The Basics, Pt.1
T1.4
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Step C: Use a Monitor to View the Image
To view imagery in Chalice, Monitors are used. A
Monitor
is a window that you open
at various sizes to display the imagery, one frame at a time, at its current stage of pro-
cessing. You can bring up a monitor from almost every node in a Chalice network to
view the imagery as it appears at that point in the shot you are building.
1. Click and hold the
Local Node Menu button
on the Disk Input node to display a
list of options.
The menu can be used to display the image in various resolutions, along with
other node options that are not used in this tutorial. For more information about
these other menu options, refer to “Overview of the Node Layout” in chapter 5 of
the Chalice User Guide (p. 5.9).
2. Select
Monitor Full
from the Local Node menu to view the source image at
full resolution.
3. Review some of the viewing options available in the
Monitor Toolbar
:
• Try using the
Zoom
arrows to zoom in and out of the image (the Up arrow
zooms in, the Down arrow zooms back out).
• You can move the image around by holding down the middle mouse but-
ton on the image (the cursor will turn into a hand) and “dragging” the
image in the monitor.
• Also, note the location of the
“Cook” button
(the eye icon), which you will
be using in another monitor later in this tutorial.
N
o
t
e
:
Any changes to these toolbar options affect the current view of the
monitor image only. They do not alter the actual image data that is
output from the node in any way.
4. Close the monitor by double-clicking in the upper left corner of the monitor window.
No.1: The Basics, Pt.1
T1.5
Chalice Tutorials
Step D: Adjust the Brightness of the Image
Altering an image requires networking the Disk Input through a series of nodes de-
signed to carry out specific changes. In this example, you will use the Brightness node
to increase the brightness of the source image.
1. Pull down the
Filter
node menu
and Select a
Brightness
node
.
Be sure to let go of the mouse button as you slide the mouse over to the
workspace. Then click in the workspace to the right of the Disk Input node and
the Brightness node will appear.
2. Connect the two nodes together:
• Click on the
Output Connector
of the Disk Input node and let go of the
mouse button.
• As you slide the mouse toward the Brightness node, a white connector line
will appear, attached to the cursor.
• Click on the top
Input Connector
of the
Brightness
node to connect
the nodes.
You may have noticed that the Disk Input node does not have an input connector.
This is because you cannot feed data from other nodes into a Disk Input node,
which is used to access source imagery to be processed in Chalice.
Note:
To disconnect the nodes, you would click on the input connector of
the Brightness node, then click anywhere in the workspace.
Try this a few times to get used to the feel, being sure to connect the
two nodes before continuing the tutorial.
3. Click on the Frame View in the center of the Brightness node to view the
icon image.
4. Bring up a full-size monitor using the
Local Node menu
of the
Brightness
node.
Notice that the level of brightness has not yet changed. You must specify the ex-
tent of the changes in the
Brightness Node Panel
.
5. Select the Brightness node, if it is not already selected, by clicking the
node titlebar.
The titlebar of the currently selected node is always highlighted in blue. The
Brightness node must be the active node in order to see its parameter tabs.
No.1: The Basics, Pt.1
T1.6
Chalice Tutorials
The default value of the brightness is 1, signifying no change. Values of less than
one will darken the image, while values greater than one will brighten it.
6. Increase the brightness value to 1.75.
You can type the number into the text field of the
Brightness parameter,
or you
can use the mouse to drag the dial next to the text field.
This type of parameter control (the combination of a data entry field and dial) is
referred to as a “
tuner.
” For more information, refer to “Setting Tuners” in chap-
ter 5 of the Chalice User Guide (p. 5.25).
7. Update the image by clicking on the “
Cook
” button (eye icon) in the
Monitor Toolbar
.
Also notice that the icon image in the Brightness node has not updated to reflect
the new brightness value, but now there is a red outline around the icon image.
This indicates that a process has taken place and the image needs to be updated.
(Simply click on the icon image if you want to update it.)
8. After viewing the brightened image, close the monitor.
9. Save your work by selecting “
Save
” from the
File menu
on the Main Menu bar.
Remember, save and save often!
No.1: The Basics, Pt.1
T1.7
Chalice Tutorials
Since this is a new, untitled grail file, the Save command will bring up a
“Save to”
dialog box
very similar to the Choose File dialog. For more information about
saving, naming, and opening grail files, read the section “Working with Grail
Files” in chapter 5 of the Chalice User Guide (p. 5.5).
Step E: Create a Disk Output Node and Set Image Output Parameters
The
Disk Output
node allows you to specify how your final imagery should be writ-
ten to disk or other storage device, including the file name, location, format, and
compression options.
1. From the
I/O
node menu, select a
Disk Output
node.
Place the Disk Output to the right of the Brightness node.
2. Connect the output connector of the Brightness node to the input connector of
the Disk Output node.
3. Be sure that the Disk Output node is selected (titlebar highlighted blue) so that
the Disk Output node panel is displayed.
Disk Output features a number of parameter tabs for specifying options relating
to different file formats. (Some of these options vary according to the operating
system on which Chalice is running, because not all of the same file export
options are supported on IRIX and NT.)
For now, you only need to use the
Output tab
, which should be displayed by de-
fault.
N
o
t
e
:
There are more tabs in the Disk Output node than can be displayed at
one time. To access a tab not currently displayed, click the
Tabs popup
menu
, which lists every parameter tab available. Select a tab from the
menu list and release the mouse button.
No.1: The Basics, Pt.1
T1.8
Chalice Tutorials
4. Locate the
“File”
field in the Output tab to set the directory path and name the
file for output.
You can either type the complete pathname into the
File
text field, or click the (
+
)
button to the right of the text field to open a Choose File dialog box.
5. Click on the (
+
) button to bring up the Choose File dialog.
Make sure the “Directory:” path is set to the location in which you want the
file saved.
6. Type the name “
tutorial1.tiff
” in the
File field
at the bottom of the dialog box,
and then click the
Accept button
.
The other Disk Output parameters can be left at their defaults for this exercise.
Note:
By default, Disk Output specifies the directory path as “$JOB/$OP/”
and the filename as “$F4.tiff.” For a definition of these variables, refer
to the “Disk Output Node” description (p. 9.13) in chapter 9 of the
Chalice User Guide.
Step F: Execute the Network to Write Image to Disk
1. Pull down the
Tool
node menu and select the
Exec
node.
The
Exec
node is the main process control function for the Chalice system. It
instructs the system to begin processing a Chalice network and specifies which
frames to process and the order in which to process them. In other words, the
Exec node “executes” a Chalice network.
2. Connect the output connector of the Disk Output node to the input connector
of the Exec node. (Be sure the Exec node is selected in order to view the Exec
node panel.)
No.1: The Basics, Pt.1
T1.9
Chalice Tutorials
Each time you connect an input to an Exec node, Chalice creates an entry in the
Exec parameter tab that enables you to specify the sequence of execution for the
frames referenced by the network.
3. Specify the starting and ending frames and an increment value in the Exec node
panel entry.
For this tutorial the output image is only a single frame, so the start, end, and in-
crement values should all be set to 1.
4. Press the
Validate
button
on the Exec parameter tab.
The Validate button allows you to verify that all files referenced by the nodes in a
Chalice network are present and accessible to the system. During the validation
operation, no data will be calculated or processed.
5. After the validation is complete, press the
Execute
button
on the Exec pa-
rameter tab.
This will execute the command to process the image data in the network con-
nected to the Exec node and write the image file(s) to disk as specified in the Disk
Output node.
This is what your grail network should look like:
END OF TUTORIAL 1
