Re: [ft-devel] Patent info for LCD subpixel filter

[Dave Crossland]

In the photocomp era, may different machines were developed that produced the same visual typography using different methods :) 

On 2 September 2017 at 19:30, Behdad Esfahbod <address@hidden> wrote:

At least in the English that I learned, two things that are not the same are different. So I find the claim that "they are more same than different, as such are not different" to be patently false.

On Sep 1, 2017 11:47 PM, "Werner LEMBERG" <address@hidden> wrote:

> I am contacting you to have some information regarding the patent
> for the LCD subpixel filtering.
>
> I am currently using the Skia library with freetype, and I noticed
> in your website<https://www.freetype.org/patents.html> that there is
> a patent regarding this feature, but it’s really unclear if it’s
> possible to enable it with no risks or not.

Well, we can't answer this since we aren't lawyers.  We can only warn
that it the ClearType LCD filtering stuff is patented...

> Will it be possible to have more information about it?

Not from us, sorry.

> Or is there a safe way to use the feature?

The next release of FreeType will provide a different LCD sub-pixel
rendering method as the default (called `Harmony'), yielding
approximately identical results.  To our best knowledge the new
algorithm is not affected by any patents.


    Werner
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Cheers
Dave