Re: [fxtf-drafts] [filter-effects] Why can't opacity() filter function ever increase opacity? from Amelia Bellamy-Royds via GitHub on 2017-06-10 (public-fxtf-archive@w3.org from June 2017)

From: Amelia Bellamy-Royds via GitHub <sysbot+gh@w3.org>
Date: Sat, 10 Jun 2017 16:29:35 +0000
To: public-fxtf-archive@w3.org
Message-ID: <issue_comment.created-307575604-1497112173-sysbot+gh@w3.org>

Inputs and outputs would be clamped.  The multiplicative factor would not be clamped.  So `opacity(200%)` would double the per-pixel alpha values of the input image, and then clamp them (per pixel) to the range 0-1.

The equivalent long-hand definition would be:

```xml
<filter id="opacity">
  <feComponentTransfer>
      <feFuncA type="linear" slope="[amount]"/>
  </feComponentTransfer>
</filter> 
```

where `[amount]` is the shorthand parameter as a decimal number.


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Received on Saturday, 10 June 2017 16:29:41 UTC