Opacity doesn't work if an outline has been added.

[Morten_M]

Normally, adjusting the opacity makes an object brighter:

 

If adding a black outline:

 

And adjusting the opacity, the object now gets darker:

 

 

Is this expected behaviour?

 

Thanks in advance.

Edited December 4, 2023 by Morten_M
more clear

[GarryP]

I believe that this is expected behaviour but I don’t have a good explanation for it.

I am assuming that the layer you are working with is a vector layer.

See attached video.

When you have no Outline Effect applied, and you change the Opacity of the Fill, the design will become lighter because, in this case, you are letting more of the white background ‘through’ the design – first part of video.

The Outline Effect is a pixel-based effect which looks for (partially) transparent pixels ‘within/around’ the design and fills those pixels with the required colour – second part of video.

When you now change the Opacity of the Fill, the Outline Effect is finding non-opaque pixels ‘within/around’ the design and trying to give them a colour, hence the ‘mixing’ of the design colour and the outline colour (yellow and blue giving green) – third part of video.

Like I said above, it’s not a good explanation but it’s how I understand it. (Maybe I’m looking at it wrong.)

[Hilltop]

I would say it's a bug. Blue shouldn't turn into green when the opacity is adjusted. If doing the same thing with a yellow stroke (not outline), the behavior is as expected when changing the opacity.

[GarryP]

I can’t say if it’s a bug or not; that depends on what the developers expect to happen.

Personally I think it’s a bit odd, but if that’s how the Outline Effect is supposed to work together with a non-100%-Opacity Fill then that’s okay with me. Maybe there’s a good reason for it that I don’t know about.

[NotMyFault]

It is a historic bug that outline color impact the fill area. It becomes visible when opacity is reduced below 100%.

 

[Bit Disappointed]

I use the Outline FX very rarely, but I have a feeling it needs an annual check-up. I've often seen it work very unusually with other effects, so I instinctively don't use it, and only on its own, and I wouldn't be surprised if outline also works awkwardly with transparency.

I haven't bothered to report bugs or anything else on it here, there has been so much else.

[loukash]

10 hours ago, Morten_M said:

Is this expected behaviour?

Definitely smells like a putrid bug.

[Morten_M]

Thanks for the replies.

Hopefully it will be addressed at some point.

[DWright]

Can you please confirm the MacOS that you are running as I have not been able to replicate this on my Mac

[debraspicher]

On 12/4/2023 at 7:29 AM, Bit Arts said:

I use the Outline FX very rarely, but I have a feeling it needs an annual check-up. I've often seen it work very unusually with other effects, so I instinctively don't use it, and only on its own, and I wouldn't be surprised if outline also works awkwardly with transparency.

I haven't bothered to report bugs or anything else on it here, there has been so much else.

Same. It's one of those things I use more sparingly because the effect hasn't always been aesthetically pleasing.