[MPEG-OTSPEC] Draft AHG report for your review

[Roderick Sheeter]

Good afternoon,

I'd like to keep the current working draft as a working draft this cycle to
allow time to resolve some outstanding questions about color interpolation
(gradients and potentially CPAL) and to potentially make changes based on
discussions of COLR without CPAL (discussion primarily in
https://github.com/googlefonts/colr-gradients-spec/issues/88). We could
tentatively plan to take up moving to the next PDAM stage in April.

Cheers, Rod S.

On Mon, Jan 11, 2021 at 10:24 AM Vladimir Levantovsky <
vladimir.levantovsky at gmail.com> wrote:

> All,
>
>
>
> The topics outlined below will be discussed at the Font Format breakout
> session this week. The meeting scheduled time is confirmed for Wednesday,
> Jan. 13th at 21:00 UTC, and is open for all SC29/WG3 members. If you are
> a contributing non-member and would like to be invited to participate in
> this discussion, please contact me directly.
>
>
>
> Thank you,
>
> Vladimir
>
>
>
>
>
> *From:* Vladimir Levantovsky [mailto:vladimir.levantovsky at gmail.com]
> *Sent:* Friday, January 8, 2021 5:40 PM
> *To:* 'MPEG OT Spec list' <mpeg-otspec at lists.aau.at>
> *Subject:* RE: Draft AHG report for your review
>
>
>
> Folks,
>
>
>
> I have not received any responses / comments on the draft AHG report – it
> will be presented as is.
>
>
>
> Also, for the next week’s breakout session on Font Format work – so far
> I’ve got the following topics we need to cover to finalize the text of the
> amendment:
>
> -          In 5.7.11.1.2.1 Color Lines: when it comes to color
> interpolation, currently the spec says that color values along the color
> line are linearly interpolated – is this enough?
>
> -          In 5.7.11.1.2.2 Linear Gradients: the description of the
> gradient and rotation vectors, and effects the rotation vector has on the
> final results are underspecified. Issues that need additional
> clarifications include
> a) rotation effect on color interpolation results if the angular distance
> between gradient orientation vector and rotation vector are more than 90
> degrees in either direction (CW or CCW), and
> b) what effect , if any, the magnitude of the rotation vector has.
> (Currently, the spec is silent about it.)
>
> -          In 5.7.11.1.2.3 Radial Gradients: what is the expected
> behavior in case where both circles overlap with r > 0?
>
> -          In 5.7.11.1.2.3 Radial Gradients: specify the expected
> behavior in case where a transform flattens both circles and their centers
> to a line.
>
> -          In 5.7.11.4 COLR table and OFF font variations – discuss and
> incorporate the proposed changes
> <https://github.com/googlefonts/colr-gradients-spec/commit/9cfbcaefc88f487b547431b62dfab22ee743d9b8?short_path=f8c59e8#diff-f8c59e8d70f0a695574ea35269cf5f70c46db8cc40daa2d5e128e8c79be10528>
> in the last two paragraphs.
>
>
>
> If anything is missing from this list, please let me know.
>
>
>
> Thank you,
>
> Vladimir
>
>
>
>
>
> *From:* Vladimir Levantovsky [mailto:vladimir.levantovsky at gmail.com
> <vladimir.levantovsky at gmail.com>]
> *Sent:* Wednesday, January 6, 2021 7:47 PM
> *To:* 'MPEG OT Spec list' <mpeg-otspec at lists.aau.at>
> *Subject:* Draft AHG report for your review
> *Importance:* High
>
>
>
> Dear all,
>
>
>
> Please see attached the draft of the AHG report that I will present at the
> upcoming MPEG Systems (SC29/WG3) meeting next week (Jan. 11 – 15). Your
> comments are appreciated.
>
>
>
> We do have a number of open issues that need to be resolved in order to
> finalize COLR v1 specification – it would be best if these issues are
> resolved by next week, and discussed as part of the Font Format break-out
> group session during the WG meeting. Currently, this break-out session is
> tentatively scheduled on January 13 at 21:00 UTC. We will be using one of
> the available ISO Zoom rooms; however, the meeting access information will
> only be available to WG members and cannot be shared publicly.
>
>
>
> I would like to bring your attention to the specific part of the AHG
> Recommendations section where a promotion of the current Working Draft to
> the next PDAM stage is suggested (last paragraph, also highlighted). The
> final outcome related to document promotion will likely be determined based
> on the results of the WG discussions. Our possible options are to either
> keep the document as the Working Draft and finalize all remaining issues
> before the next  WG meeting in early April, or to recommend promoting the
> document to the next PDAM stage, and address the remaining _*minor*_
> issues as part of the ballot comments. I’d like to remind you that in order
> to be able to process the ballot in time for the next meeting, it will
> likely be published as two-months ballot, and the time period for
> submission of comments will be very short (most National Bodies require
> comments to be submitted at least three weeks prior to ballot closing date).
>
>
>
> Please respond to this email with any proposed changes and corrections to
> the AHG report by the end of day Friday, Jan. 8th – No comments will be
> interpreted as approval!
>
>
>
> Thank you,
>
> Vladimir
>
>
>
>
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