TAG Value

Each mask has a tag value associated with it. You can select this tag value by clicking on the appropriate button before creating the mask, or you can select a mask from the Active Mask List and click on the tag value’s button you want to associate with it. This tool is also described in the "Interface tools" section of the introduction

Create Mask List

Select the shape of the mask you want to create. Clicking on one of the buttons in the list will create the mask in the current image. You can then edit this mask with the mouse.

You have a choice of 5 basic mask shapes:

The “rectangle” shape is defined by its 2 corner points.

The “circle” shape is defined by 2 points on the circumference.

The “polygon” shape is defined by its vertex. You can add a vertex by clicking in an edge of the shape. You can remove a vertex by placing the cursor over it and pressing the “del” key .

The “spline” used is a Catmull-Rom spline. It has the characteristics of going through every one of its control points. You can add control points by clicking on the border of the shape at the location where you want to insert the new point. You can remove a control point by placing the cursor over it and pressing the “del” key .

The “Quadrant” split the image in 4 quadrants. These are defined by a line controlled by 2 points, and another line, perpendicular to the first, passing through a third point. The upper left corner of the image always reside in the first quadrant. In the “filled” mode, the first quadrant will be of the mask’s tag value, the second quadrant of tag+1, etc.

The "Surface" shape has a fixed radius.  The radius can be changed with the command "mask: radius value" where "value" is the new radius.

Active Mask List

All the masks that are active for the current image will be displayed in this list. You can select one of these masks by clicking on its button. A number of operations can be done on the selected mask.

  Delete

Delete the selected mask

 Save

Write the information necessary to re-create the selected mask in a script file.

Top/Up/Down/Bottom

The masks are stacked in the order of their creation. You can change that order with these buttons. The order is important: if you stamp the mask to the TAG images with the Replace option, the mask on top will overwrite all other values.

Outline/Filled

The mask can be either just an outline or a filled shape. An outline shape will be an uninterrupted 1 pixel wide line around the shape.

Local/Global

The mask can be present either only on the image where it was created or on all the images of the group where it was created.

Stamp Mask to TAG

Use the geometrical shape of the masks to “stamp” the tag values. There are 3 sub modes to the stamping:

The tag values are limited to the range 0 to TAG_MAX. The Add and Subtract operation will not cause the tag values to go beyond this range.

Propagate

Copy all local masks from one slice to the next. This operation will not affect global masks, since they are already present on all slices. This tool is also described in the "Interface tools" section of the introduction

$GEOM_MASK_CAPTURE

(F₃₂)

Capture radius (in pixels). If clicking within this distance of mask's anchor point, the point itself is considered clicked.

$GEOM_MASK_GLOBAL

(U₈)

The masks are either local (=0) or global (=1). This variable is used as default value when creating new masks.

$GEOM_MASK_FILL

(U₈)

The masks are either outlines (=0) or filled (=1). This variable is used as default value when creating new masks.

$GEOM_MASK_NB

(U₁₆)

The number of created masks.

$GEOM_MASK_LIST

(A,P)

Array of pointers to the masks.

$GEOM_MASK_ACTIVE

(P)

Pointer to the active mask.