OpenTTD | Heightmap

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[[Translation:en/Manual/Heightmap]]

A '''heightmap''' is a computer image that can be used to generate maps based on pixel brightness (See [https://www.wikipedia.org/wiki/Heightmap wikipedia]).

==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|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===
* [https://www.wikipedia.org/wiki/Bitmap_Image BMP]
* [https://www.wikipedia.org/wiki/PNG PNG]

===Example===
<gallery>
File:en/Manual/Heightmap img.png|If you would create heightmap from this file...
File:en/Manual/Heightmap map.png|... this is what you would get
</gallery>

==Grayscale table==

NOTE: Since r27010 OpenTTD has supported height levels of up to 255 (Including Sea Level); and the 8-bit palette is not forced into generating the 16 levels below.
This table is therefore defunct when more than 16 height levels are enabled.
The range of colours between levels now splits according to 255/n where "n" is the number of height levels specified in the settings... Or  Value * height_levels / 255, (255 being the limit of an 8 bit value)...

{|
! 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
|}

==External links==
*[http://www.tt-forums.net/viewtopic.php?t=27052 How To: Generate Superb Heightmaps :)]
*[http://www.tt-forums.net/download/file.php?id=92633 Updated version (Jun 2008) of the HowTo by sootynz (Word Document)]
*[http://www.tt-forums.net/viewtopic.php?t=29323 Heightmaps (available and on request) on the Forum]
*[https://github.com/bunburya/bother Bother - a tool to generate heightmaps from real-world elevation data]
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