Combine Image Tool in Descartes


 Product(s):Bentley Descartes for MicroStation
 Version(s):08.11.09.601
 Environment:N\A
 Area:Tools
 Subarea:N\A

Exercise displaying output raster image usimg Combine Image Tool

Background

Found in the Raster Manager Edit menu, Combine Images is used to perform a logical operation on a selected area of two specified rasters and places the resulting data on a destination raster.
 
 

Steps to Accomplish

 

The logical operations are:

 

 

·         And - The destination file contains only the overlapping regions of the two source images.

 

·         Or - The destination file will contain all of the raster data from both source files.

 

  

·         Xor - The destination file contains only those regions that do not overlap one another.

 

·         Compare - The destination file contains only those regions of the first source file that are not overlapped by the second source file.

 

 

In the following set of exercises, the logical operations will be explored.

 

è Exercise: AND Operation

1    Open COMBINE_IMAGES.DGN and explore the contents of view 1. SOURCE_A.iTIFF is displayed and contains a single area of raster data.

SOURCE_B.iTIFF is turned off in view 1 and also contains a single area of raster data.

DESTINATION_A.iTIFF is turned off in view 1 and is an empty raster file.

 

                 

Source A                       Source B                    Source A and B

 

 

2         Enable the display of the three images in View 1.

3         From the Raster Manager Edit menu, select Combine Images with the following settings:

Logical Operation: And

Area: Block

Source 1: SOURCE_A.iTIFF

Source 2: SOURCE_B.iTIFF

Destination: DESTINATION_A.iTIFF

Work in Image Plane: Off

 

4         Follow the prompts and define a block to surround the raster data.

5         Turn off the display of the source files to view the results.

 

•        Undo the operation.

 

è Exercise: OR, Xor, and Combine operations

1    Results when repeating the previous exercise using the OR, XOR and Combine operators.

 

 

                                     

OR                                       Xor                              Combine

 

 

 Original Author:Frank McAllister