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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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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:

Name	Icon	Description
Toggle all channel display	Image Modified	This option toggles the display visibility of all channels on the image; clicking on the icon will hide or show all channels
Auto-fit LUT	Image Modified	This option toggles auto-fitting of the LUT (lookup table) function to the actual dynamic range on the image and updates the range for each frame
Toggle volume shading	Image Modified	This option applies shading to the displayed volume in 3D view when Composite rendering mode is selected

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:

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:

Icon	Display State	Description
Image Modified	Shown	The selected item is visible; click on the icon to hide selected item
Image Modified	Hidden	The selected item is not visible; click on the icon to show selected item

Additionally, you can show or hide all channels by clicking on the Toggle channels visibility icon on the table header.

Change render mode

You can specify the rendering mode for channels in 3D 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 options:

Rendering Mode	Icon	Description
Maximum projection	Image Modified	Sets rendering to Maximum intensity projection mode
Composite volume	Image Modified	Sets rendering to Composite volume mode
Preview surface	Image Modified	Sets rendering to Preview surface mode

Once selected, the displayed image will refresh automatically to reflect the new selection.

A comparison between the three rendering mode displays are shown below:

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 up a color picker menu which allows you to specify a different color. 

The basic color picker (see right) is the default mode where you will be presented a number of standard colors to choose from.

When you click on the Advanced button on the basic color picker, the Advanced 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.

Change display brightness

For channels, you can adjust the brightness of the display using the lookup table (LUT) function built into the channel display settings. The lookup table control is circled in red to the right. It is located in the channel display settings with one 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 Image Modified 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 Image Modified 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

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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

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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.