Optimal ClearType Filtering Sample Page

Optimal ClearType Filtering Sample Page

Optimal ClearType Filtering Sample Page

In order to view a sample of the optimal ClearType filters, you must view this page on an LCD with RGB stripes. You will not be able to see the full ClearType effects on a CRT. Some LCDs (such as in the iBook), use BGR stripes, which will not work with these samples. First, you need to estimate the non-linear response of your display. Non-linear response is often parameterized as gamma curves. See Robert Berger’s Monitor Gamma page for more information about gamma correction. On Berger’s page, there is an image which allows you to estimate the gamma of your monitor:

When this image is on your LCD, stand back about 6 feet from your display. Ensure that the LCD is perpendicular to the line connecting your eyes to the display. Now, choose the bar where the grey looks roughly the same between the top half and the bottom half of the picture, above. The number below the bar that you select is the gamma of your LCD. If two bars have roughly the same match from top to bottom, choose the bar with the lower gamma.

Now, you can select your gamma from the list shown below. Clicking on an item on this list will take you to a page where ClearType and standard anti-aliasing are both optimized for your LCD.

This page was written by John Platt in the Signal Processing Group of Microsoft Research. Last updated: 8/21/99

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