Used to select the color mask . The drop-down list shows the existing mask that can be chosen.

If on, the raster in the selected extent will be erased.

Used to determine the maximum width of raster lines. All lines, or parts of lines, or any raster object wider than this value will not be considered as a raster line. This value is given in pixels. Use the Measure tool to measure the width of the larger lines you want to convert.

Use to set the Maximum Gap Length and the Searching Angle. Use the MicroStation Measure Distance tool to estimate the gap length. Line breaks will automatically be bridged according to the settings you specified. If a line is located within the specified distance and angle, the gap jumping procedure will continue. If no line is found, the procedure is stopped.

If on, this feature tries to recognize arcs along the line strings generated with the convert function.

If on, when a vector line is generated by automatic line conversion, it is passed through a generalization process. This process removes points from the original result to keep only those considered as necessary to characterize the original pathway of the vector line. The following options are available:

• Stream Parameters — This method uses the same parameters to simplify the polyline as the MicroStation Place Stream tool.

• Douglas-Peucker — This is perhaps the most popular method to reduce points from a polyline. It excludes points that deviate more than the set tolerance from the baseline connecting 2 neighboring points. With a polyline composed of points A, B and C. If the distance of point B from the Segment A to C is greater than the tolerance, point B will be removed from the polyline.

• Straighten Lines — This method uses the angle between points. If the angle is smaller than the tolerance, the point will be removed.

Use to enter the tolerance factor:

• For the Stream Parameters type, set the tolerance in :

  Stream Delta — Sets the minimum distance, in working units, between points of the polyline.

  Stream Tolerance — Sets the maximum distance, in working units, between points

  Stream Angle — Sets the angle in degrees.

  Stream Area — Sets the area that, when exceeded, causes a sampled point to be kept. The pertinent area is the triangle formed by extending a line between each of the last two recorded data points and the sampled point. Units are square master units, and the value must be specified as a floating point number (for example, 110.0 or 1.1E2).

• For the Douglas-Peucker type, set the tolerance in working units, maximum distance.

• For the Straighten Lines type, set the tolerance in angle between points and set a noise for the Outline Entity.