Sometimes auto-masking the images with the default settings results in an unsatisfactory mask. Determining a single threshold for the whole image can require a lot of trial and error. Different thresholds may also be required for different areas of the image.
If you wish to use colour normalisation so that shadows on the coloured backdrop are ignored then make sure the "Shadows" checkbox is selected before initialising interactive masking.
Drag the masking slider to vary the background detection threshold until the desired result is obtained. Move the slider to the right to increase the threshold and create more mask colour or to the left for the opposite effect.
If the mask display updates too slowly as you drag the slider for large images, try changing the mask display mode tomenu item. With the slider selected you can also use the cursor keys to change its value by small steps.
Select or deselect the "Holes" checkbox to allow or disallow holes in the object. If this option is selected then regions that appear similar to the background colour seen inside the object boundary are treated as part of the background mask. Clicking this button will instantly update the mask.
For finer control you can modify the background detection threshold in a rectangular region of the image. Simply click the button. Then select the desired image region by dragging with the left mouse button.
Note: To remove the region selection just click on the image without dragging.
As before the "Holes" checkbox will switch the allow holes option on and off. If you wish to change the colour normalisation setting with the "Shadows" checkbox, you will need to re-initialise the auto-masking using the button.
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(The 3DSOM Pro Settings Window)
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(Using the Magic Highlighter masking tool)