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<!DOCTYPE html>
<html>
<!-- This is an automatically generated file. Do not edit.
This file is part of RGBDS.
Copyright (c) 2013-2018, stag019 and RGBDS contributors.
SPDX-License-Identifier: MIT
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<style>
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<title>RGBGFX(1)</title>
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</tr>
</table>
<div class="manual-text">
<h1 class="Sh" title="Sh" id="NAME"><a class="selflink" href="#NAME">NAME</a></h1>
<b class="Nm" title="Nm">rgbgfx</b> &#x2014; <span class="Nd" title="Nd">Game
Boy graphics converter</span>
<h1 class="Sh" title="Sh" id="SYNOPSIS"><a class="selflink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<section class="Sh">
<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
<code class="Nm">rgbgfx</code> &#x2014;
<div class="Nd">Game Boy graphics converter</div>
</section>
<section class="Sh">
<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
<table class="Nm">
<tr>
<td><b class="Nm" title="Nm">rgbgfx</b></td>
<td>[<span class="Op"><b class="Fl" title="Fl">-DfFhPTVv</b></span>]
[<span class="Op"><b class="Fl" title="Fl">-o</b>
<var class="Ar" title="Ar">outfile</var></span>]
[<span class="Op"><b class="Fl" title="Fl">-d</b>
<var class="Ar" title="Ar">depth</var></span>]
[<span class="Op"><b class="Fl" title="Fl">-p</b>
<var class="Ar" title="Ar">palfile</var></span>]
[<span class="Op"><b class="Fl" title="Fl">-t</b>
<var class="Ar" title="Ar">mapfile</var></span>]
[<span class="Op"><b class="Fl" title="Fl">-x</b>
<var class="Ar" title="Ar">tiles</var></span>]
<var class="Ar" title="Ar">file</var></td>
<td><code class="Nm">rgbgfx</code></td>
<td>[<code class="Fl">-ADfFhmPTuVv</code>] [<code class="Fl">-o</code>
<var class="Ar">outfile</var>] [<code class="Fl">-a</code>
<var class="Ar">attrmap</var>] [<code class="Fl">-d</code>
<var class="Ar">depth</var>] [<code class="Fl">-p</code>
<var class="Ar">palfile</var>] [<code class="Fl">-t</code>
<var class="Ar">tilemap</var>] [<code class="Fl">-x</code>
<var class="Ar">tiles</var>] <var class="Ar">file</var></td>
</tr>
</table>
<h1 class="Sh" title="Sh" id="DESCRIPTION"><a class="selflink" href="#DESCRIPTION">DESCRIPTION</a></h1>
The <b class="Nm" title="Nm">rgbgfx</b> program converts PNG images into the
Nintendo Game Boy's planar tile format.
<div style="height: 1.00em;">&#x00A0;</div>
The resulting colors and their palette indices are determined differently
depending on the input PNG file:
</section>
<section class="Sh">
<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
The <code class="Nm">rgbgfx</code> program converts PNG images into the Nintendo
Game Boy's planar tile format.
<p class="Pp">The resulting colors and their palette indices are determined
differently depending on the input PNG file:</p>
<ul class="Bl-dash">
<li class="It-dash">If the file has an embedded palette, that palette's color
and order are used.</li>
<li class="It-dash">If not, and the image only contains shades of gray, rgbgfx
maps them to the indices appropriate for each shade. Any undetermined
indices are set to respective default shades of gray. For example: if the
bit depth is 2 and the image contains light gray and black, they become
the second and fourth colors - and the first and third colors get set to
default white and dark gray. If the image has multiple shades that map to
the same index, the palette is instead determined as if the image had
color.</li>
<li class="It-dash">If the image has color (or the grayscale method failed),
the colors are sorted from lightest to darkest.</li>
<li>If the file has an embedded palette, that palette's color and order are
used.</li>
<li>If not, and the image only contains shades of gray, rgbgfx maps them to
the indices appropriate for each shade. Any undetermined indices are set
to respective default shades of gray. For example: if the bit depth is 2
and the image contains light gray and black, they become the second and
fourth colors - and the first and third colors get set to default white
and dark gray. If the image has multiple shades that map to the same
index, the palette is instead determined as if the image had color.</li>
<li>If the image has color (or the grayscale method failed), the colors are
sorted from lightest to darkest.</li>
</ul>
<div style="height: 1.00em;">&#x00A0;</div>
The input image may not contain more colors than the selected bit depth allows.
Transparent pixels are set to palette index 0.
<h1 class="Sh" title="Sh" id="ARGUMENTS"><a class="selflink" href="#ARGUMENTS">ARGUMENTS</a></h1>
<p class="Pp">The input image may not contain more colors than the selected bit
depth allows. Transparent pixels are set to palette index 0.</p>
</section>
<section class="Sh">
<h1 class="Sh" id="ARGUMENTS"><a class="permalink" href="#ARGUMENTS">ARGUMENTS</a></h1>
<dl class="Bl-tag">
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#D"><b class="Fl" title="Fl" id="D">-D</b></a></dt>
<dd class="It-tag">Debug features are enabled.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#f"><b class="Fl" title="Fl" id="f">-f</b></a></dt>
<dd class="It-tag">Fix the input PNG file to be a correctly indexed
image.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#F"><b class="Fl" title="Fl" id="F">-F</b></a></dt>
<dd class="It-tag">Same as <b class="Fl" title="Fl">-f</b>, but additionally,
the supplied command line parameters are saved within the PNG and will be
loaded and automatically used next time.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#d"><b class="Fl" title="Fl" id="d">-d</b></a>
<var class="Ar" title="Ar">depth</var></dt>
<dd class="It-tag">The bit depth of the output image (either 1 or 2). By
default, the bit depth is 2 (two bits per pixel).</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#h"><b class="Fl" title="Fl" id="h">-h</b></a></dt>
<dd class="It-tag">Lay out tiles horizontally rather than vertically.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#o"><b class="Fl" title="Fl" id="o">-o</b></a>
<var class="Ar" title="Ar">outfile</var></dt>
<dd class="It-tag">The name of the output file.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#p"><b class="Fl" title="Fl" id="p">-p</b></a>
<var class="Ar" title="Ar">palfile</var></dt>
<dd class="It-tag">Output the image's palette in standard GBC palette format -
bytes (8 bytes for two bits per pixel, 4 bytes for one bit per pixel)
containing the RGB15 values in little-endian byte order. If the palette
contains too few colors, the remaining entries are set to black.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#P"><b class="Fl" title="Fl" id="P">-P</b></a></dt>
<dd class="It-tag">Same as <b class="Fl" title="Fl">-p</b>, but the palette
file output name is made by taking the input PNG file's filename, removing
the file extension, and appending <i class="Pa" title="Pa">.pal</i>.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#t"><b class="Fl" title="Fl" id="t">-t</b></a>
<var class="Ar" title="Ar">mapfile</var></dt>
<dd class="It-tag">If any tiles are the same, don't place the repeat tiles in
the output file, and make a tilemap file.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#T"><b class="Fl" title="Fl" id="T">-T</b></a></dt>
<dd class="It-tag">Same as <b class="Fl" title="Fl">-t</b>, but the tilemap
file output name is made by taking the input filename, removing the file
extension, and appending <i class="Pa" title="Pa">.tilemap</i>.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#u"><b class="Fl" title="Fl" id="u">-u</b></a></dt>
<dd class="It-tag">Truncate repeated tiles. Useful with tilemaps.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#V"><b class="Fl" title="Fl" id="V">-V</b></a></dt>
<dd class="It-tag">Print the version of the program and exit.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#v"><b class="Fl" title="Fl" id="v">-v</b></a></dt>
<dd class="It-tag">Verbose. Print errors when the command line parameters and
the parameters in the PNG file don't match.</dd>
<dt class="It-tag">&#x00A0;</dt>
<dd class="It-tag">&#x00A0;</dd>
<dt class="It-tag"><a class="selflink" href="#x"><b class="Fl" title="Fl" id="x">-x</b></a>
<var class="Ar" title="Ar">tiles</var></dt>
<dd class="It-tag">Trim the end of the output file by this many tiles.</dd>
<dt><a class="permalink" href="#a"><code class="Fl" id="a">-a</code></a>
<var class="Ar">attrmap</var></dt>
<dd>Generate a file of tile mirroring attributes for OAM or (CGB-only)
background tiles. For each tile in the input file, a byte is written
representing the dimensions that the associated tile in the output file
should be mirrored. Useful in combination with <code class="Fl">-m</code>
to keep track the mirror direction of mirrored duplicate tiles.</dd>
<dt><a class="permalink" href="#A"><code class="Fl" id="A">-A</code></a></dt>
<dd>Same as <code class="Fl">-a</code>, but the attrmap file output name is
made by taking the input filename, removing the file extension, and
appending <span class="Pa">.attrmap</span>.</dd>
<dt><a class="permalink" href="#D"><code class="Fl" id="D">-D</code></a></dt>
<dd>Debug features are enabled.</dd>
<dt><a class="permalink" href="#f"><code class="Fl" id="f">-f</code></a></dt>
<dd>Fix the input PNG file to be a correctly indexed image.</dd>
<dt><a class="permalink" href="#F"><code class="Fl" id="F">-F</code></a></dt>
<dd>Same as <code class="Fl">-f</code>, but additionally, the supplied command
line parameters are saved within the PNG and will be loaded and
automatically used next time.</dd>
<dt><a class="permalink" href="#d"><code class="Fl" id="d">-d</code></a>
<var class="Ar">depth</var></dt>
<dd>The bit depth of the output image (either 1 or 2). By default, the bit
depth is 2 (two bits per pixel).</dd>
<dt><a class="permalink" href="#h"><code class="Fl" id="h">-h</code></a></dt>
<dd>Lay out tiles horizontally rather than vertically.</dd>
<dt><a class="permalink" href="#m"><code class="Fl" id="m">-m</code></a></dt>
<dd>Truncate tiles by checking for tiles that are mirrored versions of others
and omitting these from the output file. Useful with tilemaps and attrmaps
together to keep track of the duplicated tiles and the dimension mirrored.
Tiles are checked for horizontal, vertical, and horizontal-vertical
mirroring. Implies <code class="Fl">-u</code>.</dd>
<dt><a class="permalink" href="#o"><code class="Fl" id="o">-o</code></a>
<var class="Ar">outfile</var></dt>
<dd>The name of the output file.</dd>
<dt><a class="permalink" href="#p"><code class="Fl" id="p">-p</code></a>
<var class="Ar">palfile</var></dt>
<dd>Output the image's palette in standard GBC palette format - bytes (8 bytes
for two bits per pixel, 4 bytes for one bit per pixel) containing the
RGB15 values in little-endian byte order. If the palette contains too few
colors, the remaining entries are set to black.</dd>
<dt><a class="permalink" href="#P"><code class="Fl" id="P">-P</code></a></dt>
<dd>Same as <code class="Fl">-p</code>, but the palette file output name is
made by taking the input PNG file's filename, removing the file extension,
and appending <span class="Pa">.pal</span>.</dd>
<dt><a class="permalink" href="#t"><code class="Fl" id="t">-t</code></a>
<var class="Ar">tilemap</var></dt>
<dd>Generate a file of tile indices. For each tile in the input file, a byte
is written representing the index of the associated tile in the output
file. Useful in combination with <code class="Fl">-u</code> or
<code class="Fl">-m</code> to keep track of duplicate tiles.</dd>
<dt><a class="permalink" href="#T"><code class="Fl" id="T">-T</code></a></dt>
<dd>Same as <code class="Fl">-t</code>, but the tilemap file output name is
made by taking the input filename, removing the file extension, and
appending <span class="Pa">.tilemap</span>.</dd>
<dt><a class="permalink" href="#u"><code class="Fl" id="u">-u</code></a></dt>
<dd>Truncate tiles by checking for tiles that are exact duplicates of others
and omitting these from the output file. Useful with tilemaps to keep
track of the duplicated tiles.</dd>
<dt><a class="permalink" href="#V"><code class="Fl" id="V">-V</code></a></dt>
<dd>Print the version of the program and exit.</dd>
<dt><a class="permalink" href="#v"><code class="Fl" id="v">-v</code></a></dt>
<dd>Verbose. Print errors when the command line parameters and the parameters
in the PNG file don't match.</dd>
<dt><a class="permalink" href="#x"><code class="Fl" id="x">-x</code></a>
<var class="Ar">tiles</var></dt>
<dd>Trim the end of the output file by this many tiles.</dd>
</dl>
<h1 class="Sh" title="Sh" id="EXAMPLES"><a class="selflink" href="#EXAMPLES">EXAMPLES</a></h1>
</section>
<section class="Sh">
<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
The following will take a PNG file with a bit depth of 1, 2, or 8, and output
planar 2bpp data:
<div class="Pp"></div>
<div class="D1">$ rgbgfx -o out.2bpp in.png</div>
<div class="Pp"></div>
The following creates a planar 2bpp file with only unique tiles, and its tilemap
<i class="Pa" title="Pa">out.tilemap</i>:
<div class="Pp"></div>
<div class="D1">$ rgbgfx -T -u -o out.2bpp in.png</div>
<div class="Pp"></div>
The following will do nothing:
<div class="Pp"></div>
<div class="D1">$ rgbgfx in.png</div>
<h1 class="Sh" title="Sh" id="SEE_ALSO"><a class="selflink" href="#SEE_ALSO">SEE
<p class="Pp"></p>
<div class="Bd Bd-indent">$ rgbgfx -o out.2bpp in.png</div>
<p class="Pp">The following creates a planar 2bpp file with only unique tiles,
and its tilemap <span class="Pa">out.tilemap</span>:</p>
<p class="Pp"></p>
<div class="Bd Bd-indent">$ rgbgfx -T -u -o out.2bpp in.png</div>
<p class="Pp">The following creates a planar 2bpp file with only unique tiles
(accounting for tile mirroring) and its associated tilemap
<span class="Pa">out.tilemap</span> and attrmap
<span class="Pa">out.attrmap</span>:</p>
<p class="Pp"></p>
<div class="Bd Bd-indent">$ rgbgfx -A -T -m -o out.2bpp in.png</div>
<p class="Pp">The following will do nothing:</p>
<p class="Pp"></p>
<div class="Bd Bd-indent">$ rgbgfx in.png</div>
</section>
<section class="Sh">
<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
ALSO</a></h1>
<a class="Xr" title="Xr">rgbds(7)</a>, <a class="Xr" title="Xr">rgbasm(1)</a>,
<a class="Xr" title="Xr">rgblink(1)</a>,
<a class="Xr" title="Xr">rgbfix(1)</a>, <a class="Xr" title="Xr">gbz80(7)</a>
<h1 class="Sh" title="Sh" id="HISTORY"><a class="selflink" href="#HISTORY">HISTORY</a></h1>
<b class="Nm" title="Nm">rgbgfx</b> was created by
<span class="An" title="An">stag019</span> to be included in RGBDS. It is now
maintained by a number of contributors at
<a class="Lk" title="Lk" href="https://github.com/rednex/rgbds">https://github.com/rednex/rgbds</a>.</div>
<a class="Xr">rgbds(7)</a>, <a class="Xr">rgbasm(1)</a>,
<a class="Xr">rgblink(1)</a>, <a class="Xr">rgbfix(1)</a>,
<a class="Xr">gbz80(7)</a>
</section>
<section class="Sh">
<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
<code class="Nm">rgbgfx</code> was created by <span class="An">stag019</span> to
be included in RGBDS. It is now maintained by a number of contributors at
<a class="Lk" href="https://github.com/rednex/rgbds">https://github.com/rednex/rgbds</a>.
</section>
</div>
<table class="foot">
<tr>
<td class="foot-date">January 26, 2018</td>