Pitney Bowes MapInfo Professional - Manual (Page 357)

Modifying Control Points for Raster Images
If you must adjust the coordinates of a control point because the error is unacceptable, highlight the
point in the Image Registration dialog box and choose another location for it in the Map window. To
delete control points, click the point and choose the Delete button.
Raster Image Display Options
You can display more than one raster image in a window at a time. This is limited only by your computer's
memory. However, if you want to digitize from the raster image, it is best to use only one image in a Map
window. This is because two raster images will probably have slightly different rotations.
When using two raster images with different projections, keep in mind that MapInfo Professional will use
the projection of the image that is opened first. This means that the second image is only positioned
approximately.
Color (Raster Image)
Once you have displayed a raster image file in a Map window, you can make adjustments to the colors
in the image. From the Table menu, select to Raster and click Adjust Image Styles to change the
settings for that .tab file. From the Map menu, select Layer Control. Double-click the layer to display
the Layer Properties dialog box. On the Layer Display tab, check the Style Override check box and
click the Style button to adjust the raster style only in this Map window.
The Adjust Image Styles dialog box lets you set the contrast and brightness of the image, set
translucency, display color raster images in shades of gray, and make one color in the image transparent.
Using the Adjust Image Styles dialog box does not modify the raster image file; instead, it changes the
way MapInfo Professional displays the raster image file. If you change an image's display style, MapInfo
Professional records the new display style in the table file (for example PARCELS.TAB) or in the
workspace for per layer styles, but MapInfo Professional does not alter the contents of the raster image
file (PARCELS.GIF) in any way.
357 MapInfo Professional User Guide
Chapter 13: Registering Raster Images