Channel display is one of the four sections in Display settings. This section lets you adjust the appearance of each channel on the currently-displayed image. The adjustments applied here only changes how the image is shown in the image panel and will not change the underlying data on the image.
Interface
The channel display settings is found in the Display settings panel in Aivia at the very top. The table header contains controls that applies to the whole image whereas each table row contains controls that applies to just that channel. An example of the channel display settings is shown below:
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On this page:
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Table header
The table header contains descriptions for each column on the display table as well as global display options on the image. The three buttons are:
Table row
Each table row in the channel display settings represents a single channel on the displayed image. The background color of each row corresponds to the specified channel color on the Color column of the table. Each row can be controlled independently to adjust the display settings of each channel. There are five controls:
This option allows you to specify the display dynamic range of the selected channel; there are two sliders, which can be dragged along the entire table row:
- Left slider controls the minimum intensity value; pixels with intensity less than this specified value are treated as minimum brightness
- Right slider controls the maximum intensity value; pixels with intensity greater than this specified value are treated as maximum brightness
Using the channel display settings
The Channel display settings will be active whenever you have an image loaded and displayed in Aivia. The software automatically populates the table based on the number of channels that are on the image and the channel color.
Set display visibility
Each channel can be set to show or hide separately by clicking on the Toggle Visibility icon to the left of its name. The icon has two states:
Interface
The Channel Settings panel is at the top of the column to the right of the Image Viewer by default. The Channel Settings table header contains controls that apply to the whole image, and each table row contains controls that apply to just the corresponding channel. An example of the Channel Settings table is shown below.
Table header
The table header contains labels for each column as well as global display options for the image. The three (3) buttons in the table header are the following:
| Name | Icon | Description |
|---|---|---|
| Show/Hide All Channels |
| Toggles the visibility of all channels on the image |
| Apply Channel Display Color |
| Sets the color display for each channel from a list of pre-defined color maps |
| Auto-fit LUT |
| Toggles auto-fitting of the lookup table (LUT) function to the actual dynamic range of the image and updates the range for each frame |
| Toggle Volume Shading |
| Applies shading to the displayed volume in 3D View when Composite Volume mode is selected |
Table row
Each table row in the Channel Settings table represents a single channel on the displayed image. The background color of each row corresponds to the specified channel color in the Color column of the table. Each row can be controlled independently to adjust the display settings of each channel. There are five (5) controls:
| Name | Icon | Description |
|---|---|---|
| Show Expanded LUT |
| Expands the LUT display of the selected channel |
| Show/Hide Channel |
| Allows you to show or hide the selected channel from view |
| LUT Adjustment Controls |
| Allows you to specify the displayed dynamic range of the selected channel; there are two sliders that can be dragged along the entire table row:
|
| Color Picker |
| Opens a color picker that lets you select a desired display color for the selected channel |
| Render Mode Selector |
| Lets you specify the rendering mode of the selected channel in 3D View |
Using the Channel Settings panel
The Channel Settings are active whenever you have an image loaded and displayed in Aivia. The software automatically populates the table based on the number of channels that are on the image and the channel color(s).
Apply Channel Display Color
This function sets the display color of each channel to a color that is based on a color map selected by the user. The color maps are predefined such that when applied, each channel's display color is different from its neighboring channel(s).
There are two types of color maps available: Discrete and Gradient.
- Discrete color maps assign a color to each channel that is distinctly different from its neighbors' color. This type of color maps helps to differentiate adjacent channels more easily.
- Gradient color maps assign a color to each channel such that each color is a gradual change from one end of the color spectrum to the other. This type helps to identify the channel names by color shown in the image viewer.
To apply a color map, click on the
icon to display the list of available color maps. Click to select the desired color map, and the channels colors will be updated accordingly.
Additionally, there is an option to reverse the order of the colors assigned to each channel. Click on the icon to display the list of available color maps, the click Reverse Channel Colors. The colors assigned from the first to the last channel will then be applied from the last to the first channel, thus reversing the order of assignments.
Set channel visibility
Channels can be shown and hidden individually with the Show/Hide Channel icons to the left of their names. The Show/Hide Channel icon has two states:
| Display State | Icon | Description |
|---|---|---|
| Shown |
| The selected item is visible; click on the icon to hide selected hide the selected item. |
| Hidden | Hidden
| The selected item is not visible; click on the icon to show selected show the selected item. |
Additionally, you can show or /hide all channels by clicking on the Toggle channels visibility icon on Show/Hide All Channels icon in the table header.
Change render mode
You can specify the rendering mode for channels in 3D view View by clicking on the icon associated with the selected item in the View column. Clicking on the icon will bring up a list of render mode options that are available for the selected item. There are three (3) options:
| Rendering Mode | Icon | Description |
|---|---|---|
| Maximum projectionProjection |
| Sets rendering to Maximum intensity projection Intensity Projection mode |
| Composite volumeVolume | | Sets rendering to Composite volume Volume mode |
| Preview surfaceSurface |
| Sets rendering to Preview surface Surface mode |
Once a new rendering mode is selected, the displayed image will refresh refreshes automatically to reflect the new selection.
| Info |
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Depending on your hardware, the size of the image and the rendering mode chosen, it may take Aivia up to several minutes to fully render the display image with the specified settings. |
A comparison between the three rendering mode displays are (3) rendering modes is shown below:.
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| Maximum |
| Projection | Composite |
| Volume | Preview |
| Surface |
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| Render mode options |
Change channel color
You can change the channel color display by clicking on the icon (or colored rectangle) associated with the selected channel in the Color column. Clicking on the icon will bring brings up a color picker menu, which allows you to specify a different color.
The basic color picker Basic Color Picker (see right) is the default mode where you will be presented color picker, which presents a number of standard colors to choose from.
When you click on the Advanced button on the basic color pickerBasic Color Picker, the Advanced color picker Color Picker will be shown (see right). Click or drag the slider on the right to specify the desired hue (color) and click anywhere on the main display to specify the saturation and brightness desired. Alternately, you can also specify a color by entering the hexadecimal color code in the textbox below the main display.Additionally, you can apply a preset pseudo-color palette on the displayed image channel through the expanded Lookup table (LUT) controls. Information on how to apply pseudo-color palettes to the image can be found in the LUT page
Additional LUT mapping and color options are available in the Advanced Coloring menu, which is found in the right-click menu of each channel-name cell in the Channel Settings table. The Advanced Coloring > LUT Mappings menu contains a variety of LUT mappings that you may choose from.
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| Basic channel color pickerColor Picker |
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| Advanced channel color pickerColor Picker |
Change display brightness
For channels, you You can adjust the displayed brightness of the display channels using the lookup table (LUT) function built into the channel display settings. The lookup table Channel Settings. An LUT control is circled in red to the right. It is located in the channel display settings with one There is one (1) pair of controls for each channel. When you hover over the control, the cursor changes and you can click and drag the cursor to the left or right to modify the displayed dynamic range. This action will not alter the pixel values on the images, merely the brightness of the displayed image.
You can also set the LUT to update automatically by clicking on the Auto-fit LUT icon. When toggled on, the brightness of the displayed image will be determined by the dynamic range (minimum pixel intensity to maximum pixel intensity) at the current frame.
Show expanded LUT
You can open the advanced controls by clicking on the Expand 
icon on the far left side of each table row to show the additional settings that are available for the selected channel. When expanded, you will see one of the two following options depending on the rendering mode selected:
Expanded LUT
You will see the expanded LUT if you have either the Maximum projection or Composite volume rendering mode selected. An intensity histogram is shown indicating the frequency of a given intensity occurring.
The expanded LUT mode gives you more control to specify the minimum and maximum dynamic range value as well as the option to apply a pseudo-color palette to the displayed channel.
ISO level
The ISO level display is shown when you have Preview surface rendering mode selected. The ISO Level slider and textbox lets you specify the minimum and maximum intensity levels respectively for mesh generation. This is the main control for adjusting the display when Preview surface is active.a control, the cursor changes into a left-right arrow, and you can click and drag the control to the left or right to modify the displayed dynamic range. This action does not alter the pixel/voxel values on the image, merely the brightness of the displayed image.
You can also set the LUT to update automatically by clicking on the Auto-fit LUT icon 
. When toggled on, the brightness of the displayed image is determined by the dynamic range (minimum pixel intensity to maximum pixel intensity) of the current frame.
|
| Lookup table control |
Show expanded LUT
You can click on the Expand icon on the far left side of a table row to show the expanded LUT or ISO level, depending on the selected rendering mode.
Expanded LUT
You will see the expanded LUT if you have either the Maximum Projection or Composite Volume rendering mode selected. An intensity histogram is shown indicating the frequency of each intensity level.
The expanded LUT mode gives you finer control over the minimum and maximum dynamic range values. You can double-click on the dotted line to add another LUT Adjustment Point, which can be clicked and dragged for tuning of the LUT.
ISO level
The ISO level display is shown when you have the Preview Surface rendering mode selected. The ISO Level sliders and textboxes let you specify the minimum and maximum intensity levels for mesh generation. This is the main control for adjusting the display in Preview Surface mode.
Channel Groups
Channel groups can be utilized to manage multiple channels simultaneously, offering a streamlined approach to handling numerous channels effectively. This can help keep work organized by logically grouping related channels, which is particularly useful in complex workflows.
Channel groups can be created and managed at the top of the panel: 
. The plus icon creates a new, empty channel group. The reset icon loads channel groups created within LASX if they are available with the saved image.
Channel group names can be changed by clicking on the name. Channels can be added or deleted from a group, by de/selecting them from a drop-down menu. The visibility of all channels in a group can be switched by clicking on the "eye" icon. The channel group can be deleted by the "trash" icon.
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