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32 <tr> 32 <tr>
33 <td class=table-post> 33 <td class=table-post>
34 <div class="date"> 34 <div class="date">
35 17/03 — 2020
36 </div>
37 <a href="/posts/font_size_fallacies" class="post-link">
38 <span class="post-link">Font Size Fallacies</span>
39 </a>
40 </td>
41 <td class=table-stats>
42 <span class="stats-number">
43 3.2
44 </span>
45 <span class=stats-unit>min</span>
46 </td>
47 </tr>
48
49 <tr>
50 <td class=table-post>
51 <div class="date">
35 08/03 — 2020 52 08/03 — 2020
36 </div> 53 </div>
37 <a href="/posts/termux_tandem" class="post-link"> 54 <a href="/posts/termux_tandem" class="post-link">
diff --git a/docs/index.xml b/docs/index.xml
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12 <language>en-us</language> 12 <language>en-us</language>
13 <copyright>Creative Commons BY-NC-SA 4.0</copyright> 13 <copyright>Creative Commons BY-NC-SA 4.0</copyright>
14 <item> 14 <item>
15<title>Font Size Fallacies</title>
16<description><p>I am not an expert with fonts, but I do have some
17experience <sup id="fnref1"><a href="#fn1" rel="footnote">1</a></sup>, and common sense. This post aims to debunk some
18misconceptions about font sizes!</p>
19
20<p>11 px on your display is <em>probably not</em> 11 px on my display.
21Let&#39;s do some quick math. I have two displays, 1366x768 @
2221&#8221; and another with 1920x1080 @ 13&#8221;, call them <code>A</code> and
23<code>B</code> for now.</p>
24
25<p>Display <code>A</code> has 1,049,088 pixels. A pixel is a square, of
26side say, <code>s</code> cm. The total area covered by my 21&#8221; display
27is about 1,066 cm<sup>2</sup> (41x26). Thus,</p>
28
29<pre><code>Display A
30Dimensions: 1366x768 @ 21&#34; (41x26 sq. cm)
311,049,088 s^2 = 1066
32 s = 0.0318 cm (side of a pixel on Display A)
33</code></pre>
34
35<p>Bear with me, as I repeat the number crunching for Display
36<code>B</code>:</p>
37
38<pre><code>Display B
39Dimensions: 1920x1080 @ 13&#34; (29.5x16.5 sq. cm)
402,073,600 s^2 = 486.75
41 s = 0.0153 cm (side of a pixel on Display B)
42</code></pre>
43
44<p>The width of a pixel on Display <code>A</code> is <em>double</em> the width of a
45pixel on Display <code>B</code>. The area occupied by a pixel on Display
46<code>A</code> is <em>4 times</em> the area occupied by a pixel on Display <code>B</code>.</p>
47
48<p><em>The size of a pixel varies from display to display!</em></p>
49
50<p>A 5x11 bitmap font on Display <code>A</code> would be around 4 mm tall
51whereas the same bitmap font on Display <code>B</code> would be around
521.9 mm tall. A 11 px tall character on <code>B</code> is visually
53equivalent to a 5 px character on <code>A</code>. When you view a
54screenshot of Display <code>A</code> on Display <code>B</code>, the contents are
55shrunk down by a factor of 2!</p>
56
57<p>So screen resolution is not enough, how else do we measure
58size? Pixel Density! Keen readers will realize that the 5<sup>th</sup>
59grade math problem we solved up there showcases pixel
60density, or, pixels per cm (PPCM). Usually we deal with
61pixels per inch (PPI).</p>
62
63<p><strong>Note:</strong> PPI is not to be confused with DPI <sup id="fnref2"><a href="#fn2" rel="footnote">2</a></sup> (dots
64per inch). DPI is defined for printers.</p>
65
66<p>In our example, <code>A</code> is a 75 ppi display and <code>B</code> is around
67165 ppi <sup id="fnref3"><a href="#fn3" rel="footnote">3</a></sup>. A low ppi display appears to be
68&#8216;pixelated&#8217;, because the pixels are more prominent, much
69like Display <code>A</code>. A higher ppi usually means you can view
70larger images and render crispier fonts. The average desktop
71display can stuff 100-200 pixels per inch. Smart phones
72usually fall into the 400-600 ppi (XXXHDPI) category. The
73human eye fails to differentiate detail past 300 ppi.</p>
74
75<p><em>So &#8230; streaming an 8K video on a 60&#8221; TV provides the same
76clarity as a HD video on a smart phone?</em></p>
77
78<p>Absolutely. Well, clarity is subjective, but the amount of
79detail you can discern on mobile displays has always been
80limited. Salty consumers of the Xperia 1 <sup id="fnref4"><a href="#fn4" rel="footnote">4</a></sup> will say
81otherwise.</p>
82
83<p>Maybe I will talk about font rendering in another post, but
84thats all for now. Don&#39;t judge a font size by its
85screenshot.</p>
86
87<div class="footnotes">
88<hr/>
89<ol>
90
91<li id="fn1">
92<p><a href="https://github.com/nerdypepper/scientifica">https:&#47;&#47;github.com&#47;nerdypepper&#47;scientifica</a>&#160;<a href="#fnref1" rev="footnote">&#8617;</a></p>
93</li>
94
95<li id="fn2">
96<p><a href="https://en.wikipedia.org/wiki/Dots_per_inch">https:&#47;&#47;en.wikipedia.org&#47;wiki&#47;Dots_per_inch</a>&#160;<a href="#fnref2" rev="footnote">&#8617;</a></p>
97</li>
98
99<li id="fn3">
100<p><a href="https://www.sven.de/dpi/">https:&#47;&#47;www.sven.de&#47;dpi&#47;</a>&#160;<a href="#fnref3" rev="footnote">&#8617;</a></p>
101</li>
102
103<li id="fn4">
104<p><a href="https://en.wikipedia.org/wiki/Sony_Xperia_1">https:&#47;&#47;en.wikipedia.org&#47;wiki&#47;Sony_Xperia_1</a>&#160;<a href="#fnref4" rev="footnote">&#8617;</a></p>
105</li>
106
107</ol>
108</div></description>
109<link>https://peppe.rs/posts/font_size_fallacies/</link>
110<pubDate>Tue, 17 Mar 2020 16:52:00 +0000</pubDate>
111<guid>https://peppe.rs/posts/font_size_fallacies/</guid>
112</item>
113<item>
15<title>Termux Tandem</title> 114<title>Termux Tandem</title>
16<description><p>I learnt about <code>termux</code> from a friend on IRC recently. 115<description><p>I learnt about <code>termux</code> from a friend on IRC recently.
17It looked super gimmicky to me at first, but it eventually 116It looked super gimmicky to me at first, but it eventually
diff --git a/docs/posts/font_size_fallacies/index.html b/docs/posts/font_size_fallacies/index.html
new file mode 100644
index 0000000..0f0c463
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1<!DOCTYPE html>
2<html lang="en">
3 <head>
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5 <meta charset="UTF-8">
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11 <meta property="og:description" content="a static site {for, by, about} me ">
12 <meta property="og:url" content="https://peppe.rs">
13 <link rel="icon" type="image/x-icon" href="/favicon.png">
14 <title>Font Size Fallacies · peppe.rs</title>
15 <body>
16 <div class="posts">
17 <div class="post">
18 <a href="/" class="post-end-link">⟵ Back</a>
19 <a class="stats post-end-link" href="https://raw.githubusercontent.com/nerdypepper/site/master/posts/font_size_fallacies.md
20">View Raw</a>
21 <div class="separator"></div>
22 <div class="date">
23 17/03 — 2020
24 <div class="stats">
25 <span class="stats-number">
26 32.36
27 </span>
28 <span class="stats-unit">cm</span>
29 &nbsp
30 <span class="stats-number">
31 3.2
32 </span>
33 <span class="stats-unit">min</span>
34 </div>
35 </div>
36 <span class="post-title">
37 Font Size Fallacies
38 </span>
39 <div class="post-text">
40 <p>I am not an expert with fonts, but I do have some
41experience <sup id="fnref1"><a href="#fn1" rel="footnote">1</a></sup>, and common sense. This post aims to debunk some
42misconceptions about font sizes!</p>
43
44<p>11 px on your display is <em>probably not</em> 11 px on my display.
45Let&#39;s do some quick math. I have two displays, 1366x768 @
4621&#8221; and another with 1920x1080 @ 13&#8221;, call them <code>A</code> and
47<code>B</code> for now.</p>
48
49<p>Display <code>A</code> has 1,049,088 pixels. A pixel is a square, of
50side say, <code>s</code> cm. The total area covered by my 21&#8221; display
51is about 1,066 cm<sup>2</sup> (41x26). Thus,</p>
52
53<pre><code>Display A
54Dimensions: 1366x768 @ 21&#34; (41x26 sq. cm)
551,049,088 s^2 = 1066
56 s = 0.0318 cm (side of a pixel on Display A)
57</code></pre>
58
59<p>Bear with me, as I repeat the number crunching for Display
60<code>B</code>:</p>
61
62<pre><code>Display B
63Dimensions: 1920x1080 @ 13&#34; (29.5x16.5 sq. cm)
642,073,600 s^2 = 486.75
65 s = 0.0153 cm (side of a pixel on Display B)
66</code></pre>
67
68<p>The width of a pixel on Display <code>A</code> is <em>double</em> the width of a
69pixel on Display <code>B</code>. The area occupied by a pixel on Display
70<code>A</code> is <em>4 times</em> the area occupied by a pixel on Display <code>B</code>.</p>
71
72<p><em>The size of a pixel varies from display to display!</em></p>
73
74<p>A 5x11 bitmap font on Display <code>A</code> would be around 4 mm tall
75whereas the same bitmap font on Display <code>B</code> would be around
761.9 mm tall. A 11 px tall character on <code>B</code> is visually
77equivalent to a 5 px character on <code>A</code>. When you view a
78screenshot of Display <code>A</code> on Display <code>B</code>, the contents are
79shrunk down by a factor of 2!</p>
80
81<p>So screen resolution is not enough, how else do we measure
82size? Pixel Density! Keen readers will realize that the 5<sup>th</sup>
83grade math problem we solved up there showcases pixel
84density, or, pixels per cm (PPCM). Usually we deal with
85pixels per inch (PPI).</p>
86
87<p><strong>Note:</strong> PPI is not to be confused with DPI <sup id="fnref2"><a href="#fn2" rel="footnote">2</a></sup> (dots
88per inch). DPI is defined for printers.</p>
89
90<p>In our example, <code>A</code> is a 75 ppi display and <code>B</code> is around
91165 ppi <sup id="fnref3"><a href="#fn3" rel="footnote">3</a></sup>. A low ppi display appears to be
92&#8216;pixelated&#8217;, because the pixels are more prominent, much
93like Display <code>A</code>. A higher ppi usually means you can view
94larger images and render crispier fonts. The average desktop
95display can stuff 100-200 pixels per inch. Smart phones
96usually fall into the 400-600 ppi (XXXHDPI) category. The
97human eye fails to differentiate detail past 300 ppi.</p>
98
99<p><em>So &#8230; streaming an 8K video on a 60&#8221; TV provides the same
100clarity as a HD video on a smart phone?</em></p>
101
102<p>Absolutely. Well, clarity is subjective, but the amount of
103detail you can discern on mobile displays has always been
104limited. Salty consumers of the Xperia 1 <sup id="fnref4"><a href="#fn4" rel="footnote">4</a></sup> will say
105otherwise.</p>
106
107<p>Maybe I will talk about font rendering in another post, but
108thats all for now. Don&#39;t judge a font size by its
109screenshot.</p>
110
111<div class="footnotes">
112<hr/>
113<ol>
114
115<li id="fn1">
116<p><a href="https://github.com/nerdypepper/scientifica">https:&#47;&#47;github.com&#47;nerdypepper&#47;scientifica</a>&#160;<a href="#fnref1" rev="footnote">&#8617;</a></p>
117</li>
118
119<li id="fn2">
120<p><a href="https://en.wikipedia.org/wiki/Dots_per_inch">https:&#47;&#47;en.wikipedia.org&#47;wiki&#47;Dots_per_inch</a>&#160;<a href="#fnref2" rev="footnote">&#8617;</a></p>
121</li>
122
123<li id="fn3">
124<p><a href="https://www.sven.de/dpi/">https:&#47;&#47;www.sven.de&#47;dpi&#47;</a>&#160;<a href="#fnref3" rev="footnote">&#8617;</a></p>
125</li>
126
127<li id="fn4">
128<p><a href="https://en.wikipedia.org/wiki/Sony_Xperia_1">https:&#47;&#47;en.wikipedia.org&#47;wiki&#47;Sony_Xperia_1</a>&#160;<a href="#fnref4" rev="footnote">&#8617;</a></p>
129</li>
130
131</ol>
132</div>
133
134 </div>
135
136 <div class=intro>
137 Hi. <a href=https://peppe.rs/index.xml class=feed-button>Subscribe</a>
138 <p>I'm Akshay, I go by nerd or nerdypepper on the internet.</p>
139 <p>
140 I am a compsci undergrad, Rust programmer and an enthusiastic Vimmer.
141 I write open-source stuff to pass time. I also design fonts: scientifica, curie.
142 Things I find cool usually end up here.
143 </p>
144 <p>Get in touch at [email protected] or [email protected].</p>
145 </div>
146
147 <a href="/" class="post-end-link">⟵ Back</a>
148 <a class="stats post-end-link" href="https://raw.githubusercontent.com/nerdypepper/site/master/posts/font_size_fallacies.md
149">View Raw</a>
150 </div>
151 </div>
152 </body>
153</html>
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66 .posts { 66 .posts {
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generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 06:33:40 +0000