Pitney Bowes MapInfo Professional - Manual (Page 113)

To see the results of this setting, refer to Reprojecting a Raster based on a Vector Map in the Help
System.
To set the raster reprojection options for all registered raster files:
1. On the Options menu, point to Preferences and click Image Processing to open the Image
Processing dialog box.
You can also open the Image Processing dialog box by clicking Image Processing in the Map
Options dialog box.
2. Choose a reprojection:
• Never - Prevents raster reprojection. This is the default setting which preserves the pre-version
8.5 MapInfo Professional behavior.
• Always - Ensures that reprojection is always performed, that is, MapInfo Professional calculates
the image's coordinates based on a precise formula and then the pixels are resampled using Cubic
Convolution or Nearest Neighbor options.
• Optimized - Determines the reprojection of a raster image based on the look of the destination
rectangle (a selection of the image) after transformation into the source image space. If it looks as
a rigorous rectangle (two sides are parallel to x-axis and two sides parallel to y-axis), then the
standard Windows functions stretch the source image in both directions, as it was in pre-version
8.5 MapInfo Professional. If the image fails the rigorous rectangle test, the reprojection is performed
using the resampling options.
The Resampling Method options enable when you select Always or Optimized. Never is the default
reprojection option and reflects the vector reprojection only behavior.
3. If you chose Always or Optimized, then you can decide how best to resample the image by choosing:
• Cubic Convolution provides the best restoration of pixel values because of their separateness.
Using this option, a pixel in the destination image is calculated based on the pixel values in a 4x4
pixel window centered at the original pixel in the source image. The coordinates of the original
pixel are calculated for every pixel of the destination image based on a special optimized procedure.
Pixels are then weighted based on the basic pixel coordinates. In general, we recommend you use
the Cubic Convolution resampling method for aerial images and satellite raster images to get a
better image quality. The Cubic Convolution algorithm used in MapInfo Professional is based on
the work of S.K. Park and R.A. Schowengerdt, Computervision, Graphics and Image Processing
(1983, Volume 23. Pages 258-272).
• Nearest Neighbor replaces the pixel value in the reprojected image with the original pixel value
from the source image. This resampling method takes less time to render than the Cubic Convolution
method, but may be less precise. In general we recommend you use Nearest Neighbor resampling
for raster maps, grids, and scanned maps to get faster results.
When you are reprojecting 8-bit palette raster images, such as color .TIFF or .BMP images,
MapInfo Professional uses the Nearest Neighbor resampling option without regard to the
resampling method you choose. Note:
4. Click OK to close the dialogs and save your settings.
When you choose the Always or Optimized reprojection, the reprojection process runs in the background
and there is nothing to see. However, you can see the differences that Cubic Convolution or Nearest
Neighbor resampling make in the way that the raster displays.
Setting Your Notification Preferences
MapInfo Professional updates you when there is a new maintenance patch available for download and
news about the product. You can set the frequency of these updates, or turn them off, as a software
preference.
On the Help menu, point to Check for News Feed to link to the MapInfo Professional product
notifications site where you can see the latest product news and information. Note:
113 MapInfo Professional User Guide
Chapter 4: Configuring MapInfo Professional Preferences