Heightmap
A heightmap is a computer image that can be used to generate maps based on pixel brightness (See wikipedia).
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Using Heightmaps
A heightmap can be considered a grayscale image where the brightest white (closest to #FFFFFF) is considered as the highest point of the map, and the darkest black (closest to #000000) is considered as the lowest point of the map. Look at the grayscale table below for more accurate info.
On a 1:1 image to map conversion, one pixel from the image file represents a corner of 4 tiles. Therefore, if you wish to lower/raise one whole tile, you need to make the 2x2 surrounding pixels brighter/darker.
Since edges of the map must be at sea level, at least one tile, the heightmap border can be seen as 2 pixels wide.
Supported file formats
Example
If you would create heightmap from this file...
... this is what you would get
Grayscale table
| hex | elevation |
|---|---|
| 00 - 0F | 0m (sea) |
| 10 - 1F | 30m |
| 20 - 2F | 70m |
| 30 - 3F | 100m |
| 40 - 4F | 130m |
| 50 - 5F | 170m |
| 60 - 6F | 200m |
| 70 - 7F | 230m |
| 80 - 8F | 270m |
| 90 - 9F | 300m |
| A0 - AF | 330m |
| B0 - BF | 370m |
| C0 - CF | 400m |
| D0 - DF | 430m |
| E0 - EF | 470m |
| F0 - FF | 500m |
