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MicroStation Wiki Basic Raster Editing
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    Basic Raster Editing

      Product: MicroStation
      Version: V8, XM, V8i
      Environment: N\A
      Area: Raster
      Subarea: N\A

    Raster Manager supports some basic raster editing, however only Bentley Descartes provides advanced raster editing. All editing operations that change the pixel values are not persistent - meaning that the original pixel values are not modified.  To permanently modify the pixels, Bentley Descartes would be required. 

    Transform

    Raster Manager provides these basic functions for positioning an image:

    • Move
    • Scale
    • Rotate
    • Warp
    • Mirror

    Most of these functions are similar to those found in Bentley Descartes except that Descartes provides a few additional options.  Most notably is the Helmert method for the Warp transformation and added flexibility regarding the axis selection for the Mirror transformation.  For more information, please see Bentley Descartes - Raster Transformation.
     

    Clipping

    With Raster Manager it is possible to clip an image so that only the area inside, or outside, the specified clip region is visible.

    Raster Manager - Clip Option Dialog

    • Method: Defines the method used to clip the area and can be Block, Element or Fence.  
    • Mode: Specifies if the pixels that are inside or outside the clip area should be visible.  The values are Clip Mask to display only those pixels outside the clipped area, or  Clip Boundary to display only those pixels inside the clip boundary. 

      

    Example  

    The following describes how clipping can be used to control the display of those pixels that represent a body of water. The first exercise is to define the clipping area.  This can be done by drawing a shape around the water  as shown. 

    Raster Manager - Clipping Example - Original Image

     

    Once the clipping area has been defined, the desired clipping mode must be selected in the Tool Settings dialog. For example, to only display those pixels inside the shape drawn in the previous step, set the mode to Clip Boundary.

    Raster Manager - Clip Boundary Example 

     

    On the contrary, if the pixels inside the boundary should be hidden, then the Clip Mask clipping mode should be used.  

    Raster Manager - Clip Mask Example 

      

    Appearance Modification  

    Raster Manager provides several controls for modifying the appearance of attached images.

     

    Contrast / Brightness

    Where images appear dull, or lack in contrast, you can change their contrast and brightness display settings. Additionally, you can change the Display Gamma setting. Changing any of these settings does not alter the original image. Display settings may be different for individual images and they are saved with the DGN file. Changing the Contrast and Brightness may only be carried out on one image file at a time, while the Display Gamma setting can be applied to a number of selected image files simultaneously. 

     

     

     

    Tint Adjustment

    When working with multiple, overlapping or otherwise complex designs, a tint can be applied to coloured images.  The feature can be used to assist with visualization.

     

     

    Transparency 

    For colored images, the Transparency setting is used to set a transparent color for the raster reference. The selected color in the raster image then becomes transparent, when the Transparent setting is enabled.

    For monochrome images, the Background Color setting is used to set the background color of the raster file.

    The chosen transparency color also is used as a fill color when clipping raster images.

     

    See also

    Other language sources

      Original Author: Bentley Technical Support Group
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    • Tim Hickman Created by Tim Hickman
    • When: Fri, Sep 6 2013 1:18 PM
    • Andrew Bell Last revision by Bentley Colleague Andrew Bell
    • When: Tue, Feb 21 2017 1:00 AM
    • Revisions: 5
    • Comments: 1
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