Re: [EXTERNAL] Re: Canvas Floating Point Color Values Propoal

Yes, it certainly makes sense to explicitly point out that CSS Color 4 
defines the transfer function over the extended range for all the 
predefined RGB spaces.

On 2022-11-11 04:38, Christopher Cameron wrote:
> Thanks -- those are covered by CSS Color Level 4's definition 
> <https://www.w3.org/TR/css-color-4/#predefined-sRGB>, which is linked 
> in the canvas spec. But, I'll add a remark putting together that 
> connection in the document.
>
> On Thu, Nov 10, 2022 at 6:25 PM Lars Borg <borg@adobe.com> wrote:
>
>     Does that apply? Uint8 would only support the unit range.
>     So maybe the floats would get clipped?
>
>     Lars
>
>     -----Original Message-----
>     From: Reiner Fink <reinerf@microsoft.com>
>     Date: Thursday, November 10, 2022 at 7:16 AM
>     To: Christopher Cameron <ccameron@google.com>, Lars Borg
>     <borg@adobe.com>
>     Cc: Ken Russell <kbr@google.com>, "public-colorweb@w3.org"
>     <public-colorweb@w3.org>
>     Subject: RE: [EXTERNAL] Re: Canvas Floating Point Color Values Propoal
>
>     EXTERNAL: Use caution when clicking on links or opening attachments.
>
>
>     You might want to mention how to resolve gamma for values >1.0 and
>     <0.0, eg something about extending curves and reflecting gamma
>     about y-axis.
>
>     -reiner
>
>     From: Christopher Cameron <ccameron@google.com>
>     Sent: Thursday, November 10, 2022 6:34 AM
>     To: Lars Borg <borg@adobe.com>
>     Cc: Ken Russell <kbr@google.com>; public-colorweb@w3.org
>     Subject: [EXTERNAL] Re: Canvas Floating Point Color Values Propoal
>
>     Thanks!
>
>     I've created a PR incorporating this feedback, and also fixing a
>     couple of inconsistencies at
>     https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fw3c%2FColorWeb-CG%2Fpull%2F85&amp;data=05%7C01%7Cborg%40adobe.com%7Ce4f7137b602d447f8fa308dac33f4a5a%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C638036973867549789%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=yoD92G0l59OcIJWW0nd0fN7NsdTPod70KyuzpIOc8Zs%3D&amp;reserved=0
>     <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fw3c%2FColorWeb-CG%2Fpull%2F85&amp;data=05%7C01%7Cborg%40adobe.com%7Ce4f7137b602d447f8fa308dac33f4a5a%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C638036973867549789%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=yoD92G0l59OcIJWW0nd0fN7NsdTPod70KyuzpIOc8Zs%3D&amp;reserved=0>
>
>     In particular, I was inconsistent about using "unorm8" versus
>     "uint8Clamped" for ImageData. I also changed ImageDataSettings to
>     use "dataType" instead of "colorType", since we are specifying the
>     type for ImageData's data member (BTW, would it better to use the
>     full names of the type "Uint8ClampedArray" and "Float32Array",
>     rather than the abbreviated "uint8Clamped" and "float32").
>
>     Let me know of any further feedback here or on the PR.
>
>
>     On Wed, Nov 9, 2022 at 2:54 AM Lars Borg <mailto:borg@adobe.com>
>     wrote:
>     Needs statements about conversion between unorm8 and float16
>     representations.
>     I assume such conversions will be needed.
>
>     Also, spell out that the float16 encoding is as per IEEE?
>
>     Lars
>
>     From: Ken Russell <mailto:kbr@google.com>
>     Date: Tuesday, November 8, 2022 at 2:57 PM
>     To: Christopher Cameron <mailto:ccameron@google.com>
>     Cc: "mailto:public-colorweb@w3.org" <mailto:public-colorweb@w3.org>
>     Subject: Re: Canvas Floating Point Color Values Propoal
>     Resent-From: <mailto:public-colorweb@w3.org>
>     Resent-Date: Tuesday, November 8, 2022 at 2:57 PM
>
>     EXTERNAL: Use caution when clicking on links or opening attachments.
>
>     Looks great to me!
>
>
>     On Tue, Nov 8, 2022 at 5:47 AM Christopher Cameron
>     <mailto:ccameron@google.com> wrote:
>     As discussed in the previous call, I've separated floating point
>     pixel values from HDR canvas capabilities.
>
>     The following document is that proposal.
>     https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fw3c%2FColorWeb-CG%2Fblob%2Fmaster%2Fcanvas_float.md&amp;data=05%7C01%7Cborg%40adobe.com%7Ce4f7137b602d447f8fa308dac33f4a5a%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C638036973867549789%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=Aekkng0xasOSgAC%2FO%2F8rbIfxO7HlzTOqXCU8UOcLXeU%3D&amp;reserved=0
>     <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fw3c%2FColorWeb-CG%2Fblob%2Fmaster%2Fcanvas_float.md&amp;data=05%7C01%7Cborg%40adobe.com%7Ce4f7137b602d447f8fa308dac33f4a5a%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C638036973867549789%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=Aekkng0xasOSgAC%2FO%2F8rbIfxO7HlzTOqXCU8UOcLXeU%3D&amp;reserved=0>
>
>     Please provide any feedback you have on the proposal. I will be
>     trying to get this landed in the HTML spec first, and then
>     introduce the HDR canvas proposal separately.
>
>
>
>
>     --
>     I support flexible work schedules, and I'm sending this email now
>     because it is within the hours I'm working today.  Please do not
>     feel obliged to reply straight away - I understand that you will
>     reply during the hours you work, which may not match mine.
>     (credit: jparent@)
>
-- 
Chris Lilley
@svgeesus
Technical Director @ W3C
W3C Strategy Team, Core Web Design
W3C Architecture & Technology Team, Core Web & Media