From 366df8852f503523cc4f9046d82ba9a99dd51d7f Mon Sep 17 00:00:00 2001 From: Akshay Date: Sun, 12 Feb 2023 12:13:49 +0530 Subject: new art: lapse --- docs/posts/font_size_fallacies/index.html | 79 +++++++++++++++++++++++-------- 1 file changed, 60 insertions(+), 19 deletions(-) (limited to 'docs/posts/font_size_fallacies') diff --git a/docs/posts/font_size_fallacies/index.html b/docs/posts/font_size_fallacies/index.html index 9577376..51f5b4b 100644 --- a/docs/posts/font_size_fallacies/index.html +++ b/docs/posts/font_size_fallacies/index.html @@ -28,12 +28,12 @@ 17/03 — 2020
- 32.36 + 32.37 cm   - 3.2 + 3.3 min
@@ -42,34 +42,75 @@ Font Size Fallacies
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I am not an expert with fonts, but I do have some experience 1, and common sense. This post aims to debunk some misconceptions about font sizes!

-

11 px on your display is probably not 11 px on my display. Let’s do some quick math. I have two displays, 1366x768 @ 21" and another with 1920x1080 @ 13", call them A and B for now.

-

Display A has 1,049,088 pixels. A pixel is a square, of side say, s cm. The total area covered by my 21" display is about 1,066 cm^2 (41x26). Thus,

+

I am not an expert with fonts, but I do have some experience 1, and common sense. This post aims to +debunk some misconceptions about font sizes!

+

11 px on your display is probably not 11 px on my display. +Let’s do some quick math. I have two displays, 1366x768 @ 21” and +another with 1920x1080 @ 13”, call them A and +B for now.

+

Display A has 1,049,088 pixels. A pixel is a square, of +side say, s cm. The total area covered by my 21” display is +about 1,066 cm^2 (41x26). Thus,

Display A
 Dimensions: 1366x768 @ 21" (41x26 sq. cm)
 1,049,088 s^2 = 1066
             s = 0.0318 cm (side of a pixel on Display A)
-

Bear with me, as I repeat the number crunching for Display B:

+

Bear with me, as I repeat the number crunching for Display +B:

Display B
 Dimensions: 1920x1080 @ 13" (29.5x16.5 sq. cm)
 2,073,600 s^2 = 486.75
             s = 0.0153 cm (side of a pixel on Display B)
-

The width of a pixel on Display A is double the width of a pixel on Display B. The area occupied by a pixel on Display A is 4 times the area occupied by a pixel on Display B.

+

The width of a pixel on Display A is double the +width of a pixel on Display B. The area occupied by a pixel +on Display A is 4 times the area occupied by a +pixel on Display B.

The size of a pixel varies from display to display!

-

A 5x11 bitmap font on Display A would be around 4 mm tall whereas the same bitmap font on Display B would be around 1.9 mm tall. A 11 px tall character on B is visually equivalent to a 5 px character on A. When you view a screenshot of Display A on Display B, the contents are shrunk down by a factor of 2!

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So screen resolution is not enough, how else do we measure size? Pixel Density! Keen readers will realize that the 5^th grade math problem we solved up there showcases pixel density, or, pixels per cm (PPCM). Usually we deal with pixels per inch (PPI).

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Note: PPI is not to be confused with DPI 2 (dots per inch). DPI is defined for printers.

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In our example, A is a 75 ppi display and B is around 165 ppi 3. A low ppi display appears to be ‘pixelated’, because the pixels are more prominent, much like Display A. A higher ppi usually means you can view larger images and render crispier fonts. The average desktop display can stuff 100-200 pixels per inch. Smart phones usually fall into the 400-600 ppi (XXXHDPI) category. The human eye fails to differentiate detail past 300 ppi.

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So … streaming an 8K video on a 60" TV provides the same clarity as a HD video on a smart phone?

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Absolutely. Well, clarity is subjective, but the amount of detail you can discern on mobile displays has always been limited. Salty consumers of the Xperia 1 4 will say otherwise.

-

Maybe I will talk about font rendering in another post, but thats all for now. Don’t judge a font size by its screenshot.

-
+

A 5x11 bitmap font on Display A would be around 4 mm +tall whereas the same bitmap font on Display B would be +around 1.9 mm tall. A 11 px tall character on B is visually +equivalent to a 5 px character on A. When you view a +screenshot of Display A on Display B, the +contents are shrunk down by a factor of 2!

+

So screen resolution is not enough, how else do we measure size? +Pixel Density! Keen readers will realize that the 5^th grade math +problem we solved up there showcases pixel density, or, pixels per cm +(PPCM). Usually we deal with pixels per inch (PPI).

+

Note: PPI is not to be confused with DPI 2 (dots per inch). DPI is defined for +printers.

+

In our example, A is a 75 ppi display and B +is around 165 ppi 3. A low ppi display appears to be +‘pixelated’, because the pixels are more prominent, much like Display +A. A higher ppi usually means you can view larger images +and render crispier fonts. The average desktop display can stuff 100-200 +pixels per inch. Smart phones usually fall into the 400-600 ppi +(XXXHDPI) category. The human eye fails to differentiate detail past 300 +ppi.

+

So … streaming an 8K video on a 60” TV provides the same clarity +as a HD video on a smart phone?

+

Absolutely. Well, clarity is subjective, but the amount of detail you +can discern on mobile displays has always been limited. Salty consumers +of the Xperia 1 4 will say otherwise.

+

Maybe I will talk about font rendering in another post, but thats all +for now. Don’t judge a font size by its screenshot.

+
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  1. https://github.com/nerdypepper/scientifica↩︎

    2. -

  2. https://en.wikipedia.org/wiki/Dots_per_inch↩︎

    3. -

  3. https://www.sven.de/dpi/↩︎

    4. -

  4. https://en.wikipedia.org/wiki/Sony_Xperia_1↩︎

    5. +

  5. https://github.com/nerdypepper/scientifica↩︎

    6. +

  6. https://en.wikipedia.org/wiki/Dots_per_inch↩︎

    7. +

  7. https://www.sven.de/dpi/↩︎

    8. +

  8. https://en.wikipedia.org/wiki/Sony_Xperia_1↩︎

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