Editing a Raster Image

You cannot edit the contents of a raster data file in SIS Desktop 9, i.e. you cannot add, move or delete individual pixels. There are Windows applications available which provide tools for carrying out these tasks.

• You can change various properties of the bitmap using the Properties dialog. One property that you may want to change is the pen which is used to draw the border of the bitmap.
• Use the Transparent property to view data lying beneath the raster image. Set this to True and the Brush property to Hollow.
• This causes any light pixels in the image to be transparent and dark pixels to be opaque.
• On some displays white pixels will be completely transparent. I
• In general high colour output devices will work better than low colour devices.
• Colour raster files may be viewed in grayscale by using Convert to Grey (Edit > Bitmap) 

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