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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>image64 — images for the Commodore 64's bitmap modes</title>
<meta name="description" content="A native macOS app and command-line tool that converts modern images to Commodore 64 bitmap-mode pictures: drag and drop, crop, dither to the 16-color palette, and export Koala / Art Studio files.">
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:root{
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</style>
</head>
<body>
<div class="strip" aria-hidden="true"><i class="s0"></i><i class="s1"></i><i class="s2"></i><i class="s3"></i><i class="s4"></i><i class="s5"></i><i class="s6"></i><i class="s7"></i><i class="s8"></i><i class="s9"></i><i class="s10"></i><i class="s11"></i><i class="s12"></i><i class="s13"></i><i class="s14"></i><i class="s15"></i></div>
<div class="wrap">
<header>
<p class="kicker">macOS · Commodore 64 · bitmap mode</p>
<h1>image<span class="six">6</span><span class="four">4</span></h1>
<p class="tag">A native macOS app and command-line tool — one shared engine —
that converts modern images into pictures a Commodore 64 can display: crop,
dither to the 16-color palette, satisfy the per-cell color limits, and export
files that load on real hardware.</p>
<p class="status">status: <b>v1.0.0</b> — engine, app, and CLI are built and tested. <a href="https://github.com/nschneir/image64/releases/tag/v1.0.0">Download it from GitHub Releases</a>.</p>
<div class="btns">
<a class="btn primary" href="https://github.com/nschneir/image64">VIEW ON GITHUB ▸</a>
<a class="btn" href="#constraints">THE CONSTRAINTS</a>
<a class="btn" href="https://github.com/nschneir/Project64">PROJECT 64 ▸</a>
</div>
</header>
<section id="demo" class="reveal">
<h2>WHAT THE CONVERSION DOES</h2>
<figure>
<div class="compare" id="cmp">
<img class="after" src="img/after.png" width="640" height="400"
alt="The same sunset scene converted to C64 multicolor mode: dithered purple and brown sky, dark blue mountains, a light-green sun core">
<img class="before" src="img/before.png" width="640" height="400"
alt="A smooth synthetic sunset: violet-to-orange gradient sky, a sun on the horizon, dark mountain silhouettes reflected in water">
<span class="lbl a">SOURCE</span>
<span class="lbl b">C64 MULTICOLOR</span>
<span class="bar" aria-hidden="true"></span>
<input type="range" min="0" max="100" value="50" step="0.5"
aria-label="Reveal more of the source image (left) or the converted C64 image (right)">
</div>
<figcaption>Drag the divider. A synthetic test scene (left) and the same scene
through the multicolor pipeline (right): resized to 160×200,
Floyd‑Steinberg‑dithered to the Colodore palette, then reduced to one shared
background plus three colors per 4×8 cell. This pair was generated by a
prototype of the app's conversion pipeline; the app itself is not built yet.</figcaption>
</figure>
</section>
<section id="constraints" class="reveal">
<h2>THE CONSTRAINTS</h2>
<p>The C64's VIC-II chip has a fixed 16-color palette and two bitmap modes.
Neither can put arbitrary colors at arbitrary pixels — color choices are made
per character cell, and that restriction is what gives C64 images their look.
image64 targets both modes:</p>
<div class="tscroll">
<table>
<thead><tr><th></th><th>Hires</th><th>Multicolor</th></tr></thead>
<tbody>
<tr><td>resolution</td><td>320 × 200</td><td>160 × 200, pixels displayed double-wide</td></tr>
<tr><td>cell size</td><td>8 × 8 px</td><td>4 × 8 px</td></tr>
<tr><td>colors per cell</td><td>any 2 of 16</td><td>1 shared background + any 3 of 16</td></tr>
<tr><td>memory</td><td>8000 B bitmap + 1000 B screen RAM</td><td>+ 1000 B color RAM + 1 background byte</td></tr>
</tbody>
</table>
</div>
<p class="dim"><small>Both modes display at 8:5, so the crop tool is locked to
that aspect regardless of mode.</small></p>
</section>
<section id="palette" class="reveal">
<h2>SIXTEEN COLORS</h2>
<p>Every color the VIC-II can produce. Exported files store 4-bit indices;
RGB values only matter for color matching and preview, where image64 uses the
Colodore reproduction (shown here) or the darker Pepto measurement, selectable.</p>
<div class="pal">
<figure class="sw"><div class="chip" style="background:var(--c0)"></div><figcaption><b>0 black</b>#000000</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c1)"></div><figcaption><b>1 white</b>#ffffff</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c2)"></div><figcaption><b>2 red</b>#813338</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c3)"></div><figcaption><b>3 cyan</b>#75cec8</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c4)"></div><figcaption><b>4 purple</b>#8e3c97</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c5)"></div><figcaption><b>5 green</b>#56ac4d</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c6)"></div><figcaption><b>6 blue</b>#2e2c9b</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c7)"></div><figcaption><b>7 yellow</b>#edf171</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c8)"></div><figcaption><b>8 orange</b>#8e5029</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c9)"></div><figcaption><b>9 brown</b>#553800</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c10)"></div><figcaption><b>10 light red</b>#c46c71</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c11)"></div><figcaption><b>11 dark grey</b>#4a4a4a</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c12)"></div><figcaption><b>12 grey</b>#7b7b7b</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c13)"></div><figcaption><b>13 light green</b>#a9ff9f</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c14)"></div><figcaption><b>14 light blue</b>#706deb</figcaption></figure>
<figure class="sw"><div class="chip" style="background:var(--c15)"></div><figcaption><b>15 light grey</b>#b2b2b2</figcaption></figure>
</div>
</section>
<section id="how" class="reveal">
<h2>HOW IT WORKS</h2>
<p>In the app: drop an image, adjust the 8:5 crop on the source, and watch the
converted result beside it — every change re-runs the pipeline:</p>
<ol class="pipe">
<li><b>Resize</b> the cropped image to 320×200 or 160×200 (Lanczos).</li>
<li><b>Adjust</b> brightness, contrast, saturation.</li>
<li><b>Dither</b> to the 16-color palette — Floyd–Steinberg, ordered (Bayer 4×4), or none.</li>
<li><b>Enforce cell limits</b> — keep each cell's most frequent colors, remap the rest to the nearest kept color; in multicolor, first pick the one background shared by every cell.</li>
<li><b>Pack</b> the result into C64 bitmap, screen-RAM, and color-RAM bytes.</li>
</ol>
<p>The preview is rendered from the packed bytes — not from an intermediate —
so the picture on screen is the picture that exports.</p>
<p>The same five steps run from the command line — the CLI and the app call
the identical engine code, so a scripted conversion and an app export with
the same parameters produce byte-identical files:</p>
<div class="code"><pre>image64 convert photo.jpg -o picture.koa <span class="cm"># multicolor, inferred from .koa</span>
image64 convert photo.jpg -o picture.art <span class="cm"># hires, inferred from .art</span>
image64 convert photo.jpg -o out.koa --dither bayer --palette colodore --json</pre></div>
<p>Outputs overwrite without prompting, so a shell <code>for</code> loop
batch-converts a directory. For AI agents the repository ships a skill
(<code>skills/c64-image-conversion</code>) documenting the CLI surface and the
emulator verification loop — and a test keeps that document in sync with
<code>--help</code>, so it cannot drift.</p>
</section>
<section id="formats" class="reveal">
<h2>WHAT IT EXPORTS</h2>
<div class="fmt">
<div class="f">
<h3>KOALA <small>.koa — multicolor</small></h3>
<div class="bytes" aria-hidden="true">
<i class="seg-load" style="width:2%" title="load address"></i>
<i class="seg-bmp" style="width:66%" title="bitmap"></i>
<i class="seg-scr" style="width:15%" title="screen RAM"></i>
<i class="seg-col" style="width:15%" title="color RAM"></i>
<i class="seg-bg" style="width:2%" title="background"></i>
</div>
<p class="legend">
<i class="seg-load"></i>load address $6000 (2 B)<br>
<i class="seg-bmp"></i>bitmap (8000 B)<br>
<i class="seg-scr"></i>screen RAM (1000 B)<br>
<i class="seg-col"></i>color RAM (1000 B)<br>
<i class="seg-bg"></i>background (1 B) — 10003 bytes total
</p>
</div>
<div class="f">
<h3>ART STUDIO <small>.art — hires</small></h3>
<div class="bytes" aria-hidden="true">
<i class="seg-load" style="width:2%" title="load address"></i>
<i class="seg-bmp" style="width:80%" title="bitmap"></i>
<i class="seg-scr" style="width:16%" title="screen RAM"></i>
<i class="seg-pad" style="width:2%" title="padding"></i>
</div>
<p class="legend">
<i class="seg-load"></i>load address $2000 (2 B)<br>
<i class="seg-bmp"></i>bitmap (8000 B)<br>
<i class="seg-scr"></i>screen RAM (1000 B)<br>
<i class="seg-pad"></i>padding (7 B) — 9009 bytes total
</p>
</div>
</div>
<p>Plus a runnable <code>.prg</code> — a self-displaying program that shows the
picture anywhere a C64 runs, in
<a href="https://vice-emu.sourceforge.io/">VICE</a> or on real hardware — while the
<code>.koa</code> and <code>.art</code> files are the standard interchange layouts
that existing C64 paint programs and viewers read. With the neighboring
<a href="https://github.com/nschneir/Project64">Project 64</a> toolset:</p>
<div class="code"><pre>c64 session start
c64 run picture.prg <span class="cm"># display it on the emulated machine</span></pre></div>
</section>
<section id="related" class="reveal">
<h2>RELATED PROJECTS</h2>
<p>Three Commodore toolsets built the same way — AI-written, human-directed,
and pointed at what the hardware actually does rather than an approximation
of it.</p>
<div class="fmt">
<div class="f">
<h3>PROJECT 64 <small>— the C64</small></h3>
<p>Tools, skills, and an MCP for agentic Commodore 64 coding and
debugging through the VICE emulator, driven by a <code>c64</code>
command-line tool. image64's downstream neighbor: an exported
<code>.prg</code> runs with <code>c64 run picture.prg</code>.</p>
<p><a href="https://nschneir.github.io/Project64/">nschneir.github.io/Project64 ▸</a></p>
</div>
<div class="f">
<h3>PET PROJECT <small>— the PET</small></h3>
<p>Tools, skills, and an MCP for agentic Commodore PET coding and
debugging through the VICE emulator, driven by a <code>pet</code>
command-line tool. Covers the PET's model range and both its 40- and
80-column screens.</p>
<p><a href="https://nschneir.github.io/PET-Project/">nschneir.github.io/PET-Project ▸</a></p>
</div>
</div>
</section>
<footer class="reveal">
<p>MIT licensed. Developed primarily by AI — Anthropic's Claude, via Claude
Code — under human direction; a human sets the goals and reviews the work.</p>
<div class="links">
<a href="https://github.com/nschneir/image64">▸ GitHub</a>
<a href="https://github.com/nschneir/image64/blob/main/LICENSE.md">▸ License</a>
<a href="https://github.com/nschneir/image64/blob/main/SECURITY.md">▸ Security</a>
<a href="https://github.com/nschneir/Project64">▸ Project 64</a>
</div>
</footer>
</div>
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