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Font Smoothing in Snow Leopard and Leopard

Last updated 2010-03-28 - Send Feedback
Related: macOS

Mac OS X has some undesirable behavior for font smoothing which can dramatically affect how text reads on screen, depending on your particular monitor.

This effect can drive some people batty, as I learned from a reader of this site.

Changing the font smoothing setting — Mac OS X Snow Leopard 10.6

On or off is all you get in Snow Leopard

Apple abandoned useful font smoothing user interface support in Mac OS X Leopard for a “moron setting” in Mac OS X Snow Leopard, leaving those with non-Apple displays high and dry with unattractive text display.

You’ll need to use Terminal to set things right (or at least better, which is not to say optimal).

Checking the global font smoothing override

On most systems, the global AppleFontSmoothing setting will be absent, so if you read the existing value, you’ll get a message to that effect:

llcMP:~ lloyd$ defaults -currentHost read -globalDomain AppleFontSmoothing
2010-03-28 21:31:38.215 defaults[9109:903]
The domain/default pair of (kCFPreferencesAnyApplication, AppleFontSmoothing) does not exist
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Setting the font smoothing value

Setting a value “1’ works best on my NEC 30" display for most sizes of text. Here is how to change it:

llcMP:~ lloyd$ defaults -currentHost write -globalDomain AppleFontSmoothing -int 1

You’ll need to close and reopen your application to have the change take effect. The only settings I recommend are 1 and 2.

Deleting the font smoothing override

To remove the global setting entirely:

llcMP:~ lloyd$ defaults -currentHost delete -globalDomain AppleFontSmoothing

Changing the font smoothing setting — Mac OS X Leopard 10.5

Open the Appearance control panel and experiment with the settings. The best setting will depend on your monitor, and your own personal preferences.

Changing the font smoothing style in the Appearance control panel

The effect does not take effect immediately; you must quit and restart a program to see the difference.

 

I recommend using Safari to view differences. The effect is most striking on pages that use light text on a dark background (view the blog page at diglloyd.com).

The effect can be quite pronounced on both appearance of the letters as well as the size and spacing. Here the only difference is using “12 point or smaller” versus “8 point or smaller”:

Font Smoothing = off for 12 point and smaller
Font Smoothing = off for 8 point and smaller

Examples

Here are samples of various font smoothing settings from my Mac Pro and the NEC 30" LCD 3090WQXi (an outstanding monitor).

It appears that Automatic is the same as Standard. Both are awful, but the ugliest one is Strong.

Only the Light setting provides results that don’t give me a headache. The effect is more obvious and more/less annoying when viewing an entire page (vs the limited size crops shown here).

Font Smoothing = Automatic
Font Smoothing = Standard
Font Smoothing = Light
Font Smoothing = Medium
Font Smoothing = Strong

Conclusions

You might be able to upgrade your Mac just by changing a setting, making it more pleasant to use every day!

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