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# Viewing the Pixel Values

If you are viewing an image render in the Monitor tab and you want to identify geometry, you can use the pixel probe to do this:

| 1. | In the Monitor tab, turn on the pixel probe by selecting . The pixel probe toolbar displays.

| 2. | To change the colorspace for the displayed pixel values, select from the top dropdown in the pixel probe toolbar.

To change what type of pixel value you want displayed, click the lower dropdown in the pixel probe toolbar and select:

> • ave - the mean average of the area selected.

> • min - the lowest value for each channel from the area selected.

> • max - the highest value for each channel from the area selected.

> • stdDev - the standard deviation of the area selected.

| 3. | Pick a pixel on the object in the Monitor.

To change where the pixel probe samples:

> • Ctrl+click to change the sample center point.

> • Click and drag the center point.

> • Click and drag the vertical bar to move the sample’s center left and right.

> • Click and drag the horizontal bar to move the sample’s center up and down.

> • When sampling an area, click and drag the bounding border lines to change the area’s bounding rectangle.

Katana's internal 'id' channel mapping identifies the geometry that this color originates from.

| 4. | Click on the scene graph locations widget that appears next to the geometry name in the pixel probe toolbar, and click Select in Scene Graph from the dropdown menu.

The scene graph location is highlighted in the Scene Graph tab.

| 5. | To turn off the pixel probe, click or press . (period). The pixel probe toolbar is hidden.

Note: For more information on the Monitor tab, refer to Using the Monitor Tab.