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How to set the image processing preferences in MapInfo Professional

UPDATED: April 20, 2017


The reprojection options of maps containing rasters can be controlled using the Image Reprocessing Preference.
 
1. Set the INDIVIDUAL MAP Options (on a per map window basis - not globally for every map) go to Map>Options>Image Processing button in the Map Options dialog box.
User-added image
To set the raster reprojection options Globally for all registered raster files in every map window opened:
From the Options menu, choose Preferences and Image Processing to display the Image Processing dialog box. 
**Setting Image Processing options here will be applied to Every new map window opened.
 
 
The Resampling Method options are enabled when selecting Always or OptimizedNever is the default reprojection option and reflects the vector reprojection only behavior.
 
Note: Reprojecting, particularly when reprojecting seamless tables or other large raster map layers, can take a long time. This is particularly true if the reprojection is dramatic, as when transforming world-wide rasters from Long/Lat to Mercator, for example.
 
2. Select the reprojection option that suits the raster reprojection needs. Select:
 
Never to prevent raster reprojection. This is the default setting which preserves the pre-version 8.5 MapInfo Professional behavior.
 
Always to ensure 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 to determine 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.
 
3. If selecting Always or Optimized, decide how best to resample the image from these options:
 
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 using the Cubic Convolution resampling method for aerial images and satellite rasters 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 using Nearest Neighbor resampling for raster maps, grids, and scanned maps to get faster results. 
 
Note: When 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 choosen.
 
4. After selecting these options, click OK to save them.
 
Note: The Rotate Map Window tool can now be used to rotate raster images as well.
 
When choosing the Always or Optimized reprojection options, the reprojection process runs in the background, so there is nothing to see, but the differences that the Cubic Convolution and Nearest Neighbor resampling options make can be seen in the way the raster displays.

 

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