Pitney Bowes MapInfo Professional - Manual (Page 358)

If you change an image's display style and choose OK, the new display style is applied immediately. It
will also affect all Map windows in which the image is displayed if you select the Table menu, and point
to Raster and click Adjust Image Styles. You do not need to choose Save to save the changes.
Style Override for Raster Images
MapInfo Professional provides the ability to change the display style for raster and grid images on a
per-layer basis through the Layer Control window. The Style Override option for raster images works
the same way as it does for other map layers. Just choose the Map menu, and click Layer Control, and
select a raster layer in the Layer list. Click the Layer Properties button. The Layer Properties dialog
box displays. On the Layer Display tab, select the Style Override check box and click the Style button.
The Adjust Image Styles dialog box displays. You can change any of the raster image style settings.
Zoom Layering for Raster Images
Zoom layering for raster images controlled from preferences (in the Options menu, point to Preferences
and click Map Windows and select Automatic Raster Zoom Layering). To change the zoom layering
setting for a raster layer that you are currently working with, go to the Layer Properties dialog box (from
the Map menu, select Layer Control, select the layer and click the Layer Properties button) and
to either activate or turn off zoom layering. The setting is turned on by default.
Limitations in Using Raster Images
Many of MapInfo Professional's features cannot be applied to raster image tables. As a general rule,
you cannot use MapInfo Professional to modify a raster image file. Specific limitations of raster tables
include:
• No Data Saved with Raster Images A raster table does not have columns, therefore, you cannot attach
text or numeric data directly to a raster table, and you cannot perform queries, such as Find, on a
raster table. You can, however, overlay a conventional (vector-based) MapInfo Professional table on
top of the raster image, and attach data to the conventional table.
• Map Projections and Reprojections with Raster Images: When a raster image file displays in a Map
window, the file that is opened first determines the projection of the map. If two raster images in a Map
window use different map projections, MapInfo Professional will use the projection of the map that is
opened first. The Map window will redraw slowly when you overlay other map layers on top of a raster
image. The map redraws slowly because MapInfo Professional is re-calculating map coordinates so
that the vector map objects conform to the projection of the raster image.
Adjusting the Contrast or Brightness of a Raster Image
The Adjust Image Styles dialog box lets you control how a raster image appears but does not modify
the raster image file; instead, it changes the way MapInfo Professional displays the raster image file.
Every raster image table consists of two files: a raster image file (for example, PHOTO.GIF), and a table
file (for example, PHOTO.TAB). When you change the image display styles, MapInfo Professional stores
the new style settings by modifying the table file. MapInfo Professional does not modify the raster image
file in any way.
If you change the display options and choose OK, MapInfo Professional stores the new display styles
immediately; you do not need to choose File > Save.
• For instructions, see Adjusting the Contrast or Brightness of a Raster Image in the Help System.
Adjusting the Translucency of a Raster Image
You can adjust the percentage that layers show through raster images. A translucent image allows you
to partially see through the image. Translucent images can be layered on top of other layers so that the
lower layers are partially visible through the image.
• For specific instructions, see Adjusting the Translucency of a Raster Image in the Help System.
MapInfo Professional 12.5 358
Opening a Raster Image