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

[Behdad Esfahbod]

On Sat, Sep 2, 2017 at 5:16 PM, Werner LEMBERG  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.
>
> ???  What are you referring to?
>

I'm referring to the following part of email from Alexei in the thread
"Haarmony LCD rendering":

"""
I have been soliciting feedback for a few month now specifically
regarding the Clear Type patents. Some folks pointed out this specific
paragraph: "The color values are independently generated for each of
the red, green, and blue pixel sub-components based on different
portions of the image, rather than the color values for the entire
pixel being generated based on a single sample or the same portion of
the image." This is indeed fundamental to ClearType, where each color
channel gets coverage information from completely *different*
(distinct, non-overlapping) portions of the glyph. It is too bad that
it also results in *unequal* coverage of each channel grid (aka color
fringes) and filtering becomes necessary to equalize the channels.

So, Harmony is equalized to begin with because shifting does not
change the integrated channel coverage. As for the patents, the
adjacent channels get coverage from parts of glyph that have 2/3
overlap (truly, more similar than different). This is how I would
argue that this technique is substantially not ClearType.
"""


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

[Werner LEMBERG]

> 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.

???  What are you referring to?


Werner

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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  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"  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 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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>>
>
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>


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

[Behdad Esfahbod]

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

[Werner LEMBERG]

> 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 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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[ft-devel] Patent info for LCD subpixel filter

[Luca Lolli]

Hello,

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 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.

Will it be possible to have more information about it? Or is there a safe way 
to use the feature?

Thanks
Best regards,

Luca L.

--
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Software Engineer

Ableton AG
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10119 Berlin, Germany

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Chair of the Supervisory Board/Vorsitzender des Aufsichtsrats: Uwe Struck
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