Resample

Resample changes the size of the pixels in a Bitmap item.

The overall extents of the Bitmap will remain unchanged but the original pixels will be merged together into bigger pixels. They may even be split up into smaller pixels.

Select Edit > Bitmap > Resample.

The current spacing is shown, the values being with reference to the map data underneath:

Begin to edit the width and height spacing between pixels.

If you decrease the spacing, you increase the number of pixels making up the bitmap. If you increase the spacing, the number of pixels decreases, with a corresponding decrease in the resolution of the image.

Press OK.

 

Using Resample [Edit-Bitmap], you can choose one of the following methods of carrying out the resampling:

• Copy closest pixel’s value
  
  This is the fastest and most common method. It should be used for Bitmap items which represent pictures but which use a colour palette.
  
  
  
  
• Interpolate between closest pixels
  
  This should only be used for true-colour Bitmap items (i.e. greater than 8-bit colour depth), where colour quality is important. This is slower to do than copying the closest pixel’s value, so use this method when quality is more important than speed.
  
  
  
  
• Keep sum of pixels constant
  
  This should only be used for non-picture Bitmap items. The Grid item (which is a special kind of Bitmap item) uses the pixel values to represent linear values and not colours. Sometimes the linear value represents a count, such as the number of houses within the square occupied by a pixel. In this case you would want to keep the number of houses the same before and after any resampling operations.

Each Bitmap item remembers which resampling method to use if it ever needs to be resampled again.

 

 

 

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