Nitrogen Fingers Paint

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{{FormatInfo
 
{{FormatInfo
−
| name            = NFP
+
| name            = Nitrogen Fingers Paint
 
| formattype      = electronic
 
| formattype      = electronic
 +
| subcat          = Graphics
 
| extensions      = {{ext|nfp}}
 
| extensions      = {{ext|nfp}}
 
| compression      = None
 
| compression      = None
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}}
 
}}
  
−
[[NFP]]{{fix|Stands for?}} is a simple [[text]] file format used by [https://computercraft.cc ComputerCraft] to store images.
+
[[Nitrogen Fingers Paint]] (NFP) is a simple [[text]] file format used by [https://computercraft.cc ComputerCraft] to store images.
  
 
CraftOS's <code>paint</code> program allows for easy editing of these files with a GUI.
 
CraftOS's <code>paint</code> program allows for easy editing of these files with a GUI.
−
 
  
 
== Format ==
 
== Format ==
  
−
The format consists of a text file containing a hex character for each pixel.
+
An NFP file consists of a text file containing a [[wikipedia:hexadecimal|hex]] character for each pixel.
  
−
''TO-DO''
+
Each pixel's character must be in the range <abbr title="0123456789abcdef"><code>0-f</code></abbr> and be lowercase,
 +
any other characters (including capital <abbr title="ABCDEF"><code>A-F</code></abbr>) are treated as fully transparent pixels.
  
 +
The newline (<code>\n</code>) character moves to the beginning of the next row.{{fix|End file with newline or not?}}
 +
Due to the nature of this, it is possible to have rows of different length and therefore means that nonsquare images can be created.
 +
 +
Whilst any unrecognised character is treated as a transparent pixel, it is recommended that a space be used.
 +
CraftOS's <code>paint</code> program automatically converts all transparent pixels to a space when saved.
 +
 +
=== Colours ===
 +
 +
To calculate a colour for a given value do <code>2<sup>x</sup></code> and then treat it as a 24-bit RGB value (8 bits for each of red, green and blue).
 +
 +
It is recommended that a lookup table be generated for performance.
 +
 +
=== Pixel aspect ratio ===
 +
 +
CraftOS's <code>paintutils</code> library (and therefore <code>paint</code>) uses character mode for displaying images, meaning one image "pixel" is a character cell.
 +
Character cells are at a 2:3 aspect ratio, 12×18 real pixels in size.
  
 
== Example ==
 
== Example ==
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{|
 
{|
 
|+<code>house.nfp</code>
 
|+<code>house.nfp</code>
 +
|+''[[File:NFP_transparent.png]] represents a transparent pixel.''
 
|-
 
|-
 
! NFP !! PNG !! PNG (nonsquare)
 
! NFP !! PNG !! PNG (nonsquare)
 
|-
 
|-
 
|<code><pre>
 
|<code><pre>
−
         c
+
         c␤
−
   eeeeec
+
   eeeeec␤
−
   eeeeeee
+
   eeeeeee␤
−
  eeeeeeeee
+
  eeeeeeeee␤
−
   ccccccc
+
   ccccccc␤
−
   c33cc5c
+
   c33cc5c␤
−
   ccccc5c
+
   ccccc5c␤
−
fffffffffff
+
fffffffffff␤
 
</pre></code>
 
</pre></code>
 
''<code></code>
 
''<code></code>
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|| [[File:NFP_house_nonsquare.png]]
 
|| [[File:NFP_house_nonsquare.png]]
 
|}
 
|}
−
 
  
 
== External links ==
 
== External links ==
  
 
* [https://github.com/SquidDev-CC/CC-Tweaked/blob/66e42e0817484702d3be7ab880e60246097f7ecb/src/main/resources/data/computercraft/lua/rom/apis/paintutils.lua#L50 ComputerCraft:Tweaked's CraftOS paintutils Implementation (lua)]
 
* [https://github.com/SquidDev-CC/CC-Tweaked/blob/66e42e0817484702d3be7ab880e60246097f7ecb/src/main/resources/data/computercraft/lua/rom/apis/paintutils.lua#L50 ComputerCraft:Tweaked's CraftOS paintutils Implementation (lua)]
 +
*: ''Note:'' Lua lists start at 1 so <code>2<sup>x-1</sup></code> is used when generating the lookup table.
 
* [https://tweaked.cc/module/colors.html ComputerCraft:Tweaked Wiki's Colour table] (Paint/Blit column)
 
* [https://tweaked.cc/module/colors.html ComputerCraft:Tweaked Wiki's Colour table] (Paint/Blit column)
 +
* [https://github.com/oeed/CraftOS-Standards/blob/master/standards/4-paint.md CraftOS-Standards] (Poorly documented)
 +
 +
 +
[[Category:ComputerCraft]]
 +
[[Category:File formats named after chemical elements]]

Latest revision as of 13:22, 14 March 2021

File Format
Name Nitrogen Fingers Paint
Ontology
Extension(s) .nfp
Compression None
Reference Implementation CC:T's paintutils (lua)
Error Resilience None
Nitrogen Fingers Paint (NFP) is a simple text file format used by ComputerCraft to store images.

CraftOS's paint program allows for easy editing of these files with a GUI.

Contents

[edit] Format

An NFP file consists of a text file containing a hex character for each pixel.

Each pixel's character must be in the range 0-f and be lowercase, any other characters (including capital A-F) are treated as fully transparent pixels.

The newline (\n) character moves to the beginning of the next row.[End file with newline or not?] Due to the nature of this, it is possible to have rows of different length and therefore means that nonsquare images can be created.

Whilst any unrecognised character is treated as a transparent pixel, it is recommended that a space be used. CraftOS's paint program automatically converts all transparent pixels to a space when saved.

[edit] Colours

To calculate a colour for a given value do 2x and then treat it as a 24-bit RGB value (8 bits for each of red, green and blue).

It is recommended that a lookup table be generated for performance.

[edit] Pixel aspect ratio

CraftOS's paintutils library (and therefore paint) uses character mode for displaying images, meaning one image "pixel" is a character cell. Character cells are at a 2:3 aspect ratio, 12×18 real pixels in size.

[edit] Example

house.nfp NFP transparent.png represents a transparent pixel.
NFP PNG PNG (nonsquare) 
        c␤
   eeeeec␤
  eeeeeee␤
 eeeeeeeee␤
  ccccccc␤
  c33cc5c␤
  ccccc5c␤
fffffffffff␤

NFP house.png NFP house nonsquare.png

[edit] External links

Retrieved from "http://fileformats.archiveteam.org/index.php?title=Nitrogen_Fingers_Paint&oldid=39539"
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