source: www/labs/img2oric.html @ 2212

Last change on this file since 2212 was 2212, checked in by Sam Hocevar, 15 years ago
  • Add support for inverse video on attribute change.
  • Improve Floyd-Steinberg coefficient values.
File size: 4.9 KB
Line 
1<?php header("Content-Type: text/html; charset=utf-8"); ?>
2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
3       "http://www.w3.org/TR/xhtml1/DTD/xhtml11.dtd">
4
5<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
6
7<head>
8   <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
9   <meta name="GENERATOR" content="vim" />
10   <meta name="Author" content="sam@zoy.org (Sam Hocevar)" />
11   <meta name="Description" content="Caca Labs - img2oric" />
12   <meta name="Keywords" content="libcaca, ASCII, ASCII ART, colour quantisation, dithering, oric" />
13   <title>Caca Labs - img2oric</title>
14   <link rel="icon" type="image/x-icon" href="/favicon.ico" />
15   <link rel="shortcut icon" type="image/x-icon" href="/favicon.ico" />
16   <link rel="stylesheet" type="text/css" href="/main.css" />
17</head>
18
19<body>
20
21<?php include($_SERVER["DOCUMENT_ROOT"]."/header.inc"); ?>
22
23<img src="oric.png" width="200" height="130"
24     alt="Oric computer" style="float: left; border: 0px;" />
25
26<p> <tt>img2oric</tt> converts images to the Oric screen format. The <a
27href="http://www.defence-force.org/computing/oric/gallery/index.htm">Oric
28screen format</a> is one of the most twisted standards and very little artwork
29exists for this vintage computer. It was therefore the perfect challenge for
30the Caca Labs image processing team. </p>
31
32<p> The graphical part of the Oric screen has 240×200 pixels and can only
33display 8 different colours (black, blue, red, green, cyan, magenta, yellow
34and white). Each horizontal group of 6 pixels can only use two different
35colours: the foreground and the background colours. The background <i>or</i>
36the foreground colour may also be changed (one at a time), but while doing
37so the next 6 pixels cannot be chosen: they will use the background colour
38instead. Finally, a special bit may be activated to display the current group
39of pixels in reverse video. </p>
40
41<h2 style="clear: both;"> Downloads </h2>
42
43<p> No downloads are available yet. However, the file <tt><a
44href="img2oric.c">img2oric.c</a></tt> may be compiled on Linux to obtain an
45almost functional, yet extremely slow (around 2 minutes to process an image on
46a modern computer) program. </p>
47
48<h2> Screenshots </h2>
49
50<p> These images show how <tt>img2oric</tt> performs. The results may not seem
51terribly clean, but they are probably better than anything that has been seen
52so far on an Oric computer. </p>
53
54<p> These first 4 images show the results on the same images than the ones
55on Dbug’s <a href="http://www.defence-force.org/computing/oric/coding/annexe_3/pictconv/">PictConv</a> website, to illustrate the improvements over the
56traditional RGB separation technique. </p>
57
58<p style="text-align: center;">
59  <img src="buffy.png" width="240" height="200" class="inline" alt="" />
60  <img src="output-buffy.png" width="240" height="200" class="inline" alt="" />
61</p>
62
63<p style="text-align: center;">
64  <img src="mire.png" width="240" height="200" class="inline" alt="" />
65  <img src="output-mire.png" width="240" height="200" class="inline" alt="" />
66</p>
67
68<p style="text-align: center;">
69  <img src="dog.png" width="240" height="200" class="inline" alt="" />
70  <img src="output-dog.png" width="240" height="200" class="inline" alt="" />
71</p>
72
73<p style="text-align: center;">
74  <img src="lena.png" width="240" height="200" class="inline" alt="" />
75  <img src="output-lena.png" width="240" height="200" class="inline" alt="" />
76</p>
77
78<p> The following images show <tt>img2oric</tt>’s results with grayscale
79images and cartoon images. </p>
80
81<p style="text-align: center;">
82  <img src="bufbw.png" width="240" height="200" class="inline" alt="" />
83  <img src="output-bufbw.png" width="240" height="200" class="inline" alt="" />
84</p>
85
86<p style="text-align: center;">
87  <img src="homer.png" width="240" height="200" class="inline" alt="" />
88  <img src="output-homer.png" width="240" height="200" class="inline" alt="" />
89</p>
90
91<p> The following images use real Oric artwork, taken from the Buggy Boy
92and the VIP 4 demos: they are almost pixel-perfect. </p>
93
94<p style="text-align: center;">
95  <img src="bb.png" width="240" height="200" class="inline" alt="" />
96  <img src="output-bb.png" width="240" height="200" class="inline" alt="" />
97</p>
98
99<p style="text-align: center;">
100  <img src="eatme.png" width="240" height="200" class="inline" alt="" />
101  <img src="output-eatme.png" width="240" height="200" class="inline" alt="" />
102</p>
103
104<p> And finally, this is an animation whose frames were converted to Oric
105colours using <tt>img2oric</tt>: </p>
106
107<p style="text-align: center;">
108  <img src="bear.gif" width="240" height="200" class="inline" alt="" />
109  <img src="output-bear.gif" width="240" height="200" class="inline" alt="" />
110</p>
111
112<h2> Credits </h2>
113
114<p> <tt>img2oric</tt> was written by Sam Hocevar. Thanks to Jean-Yves
115Lamoureux, Mickaël Pointier, Robert Chéramy and Fabrice Frances for their
116help, their work and the information they provided. </p>
117
118<?php $rev = '$Id$';
119      include($_SERVER['DOCUMENT_ROOT'].'/footer.inc'); ?>
120
121</body>
122</html>
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