Re: [fxtf-drafts] [compositing-2] 'lighter' vs 'plus-lighter' (#446)

The CSS Working Group just discussed `[compositing-2] 'lighter' vs 'plus-lighter'`, and agreed to the following:

* `RESOLVED: make lighter defined the way plus-lighter is now defined, pending checking some additional tests that might show differences`

<details><summary>The full IRC log of that discussion</summary>
&lt;flackr> dbaron: the compositing spec has a list of blend modes, one is lighter, one is plus-lighter. The only diff between them is that lighter does not clamp the color values to the [0, 1] range. It allows the output color to be greater than 1. It's the only compositing operator that does this.<br>
&lt;Rossen_> q?<br>
&lt;flackr> dbaron: I.e. only one that can take two colors in [0, 1] range and produce values outside of this range.<br>
&lt;flackr> dbaron: it's not clear if this is detectable?<br>
&lt;flackr> dbaron: in theory there's some color space things that might be able to test this<br>
&lt;flackr> dbaron: it would be useful to have people aware of the color stuff weigh in on what is the right thing here<br>
&lt;flackr> dbaron: there's some weigh in but it would be useful to have clear opinion<br>
&lt;flackr> dbaron: my inclination is lighter and plus-lighter should be the same<br>
&lt;flackr> dbaron: lighter should be what plus-lighter is<br>
&lt;flackr> florian: and get rid of plus-lighter?<br>
&lt;bkardell_> q+<br>
&lt;flackr> dbaron: yes<br>
&lt;Rossen_> ack bkardell_<br>
&lt;florian> s/dbaron: yes/dbaron: not sure it would be compatible with existing content to do so<br>
&lt;flackr> bkardell_: on the issue, i saw that checking the 3 impls they're using the spec formula for plus-lighter, though may need testing using other color space options...<br>
&lt;flackr> dbaron: maybe we should tentatively resolve to make them the same unless there's a reason not to<br>
&lt;flackr> bkardell_: if impls are the same seems like a good idea<br>
&lt;flackr> dbaron: they're only the same in so far as i've tested so far<br>
&lt;flackr> Rossen_: should we accept the proposal - make them the same?<br>
&lt;dbaron> Proposed resolution: make lighter defined the way plus-lighter is now defined, pending checking some additional tests that might show differences<br>
&lt;flackr> RESOLVED: make lighter defined the way plus-lighter is now defined, pending checking some additional tests that might show differences<br>
</details>


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Received on Wednesday, 10 January 2024 17:19:45 UTC