Why do objects lose color when masked?

[eobet]

Look at the top stroke. It should be a solid purple, but it clearly fades to white as it becomes transparent. Why is that?

It doesn't seem to matter what color I set the mask object to.

 

[NotMyFault]

Good find.

This is a major issue!

the layer blending gets completely wrong when

• you have a black background (ok for white)
• you apply a mask (or vector layer as mask) to a group (vs. Applied to child layers within group)

I loosely remember that this might have been reported before 

[NotMyFault]

Bug present in v1 and v2 on iPad

 

mask on group bug vs black background.afphoto

[- S -]

It may be easier if you upload a sample file.

However, as mentioned, one thing to look at is masking groups in Affinity Photo doesn't work properly if the group blend mode is set to "Passthrough" – which is the default setting for groups.  It would need to be set to "Normal" blend mode to work more as expected. Bug report HERE.

Screenshot:

 

Example:

Example.afphoto

 

[eobet]

I should have perhaps specified that this is Affinity Designer V2.

But interesting... I did not set "passthrough" myself, so Affinity did that for me and that is wrong?

Setting the group back to normal now works as expected.

[lepr]

4 hours ago, NotMyFault said:

I loosely remember that this might have been reported before 

The incorrect blending of masked Passthrough groups has been reported repeatedly for a decade. Maybe Serif is proud of some bugs.

 

[lepr]

43 minutes ago, eobet said:

But interesting... I did not set "passthrough" myself, so Affinity did that for me and that is wrong?

Passthrough is the default blend mode for a Group. You need to explicitly change it if you want a different mode, such as Normal.

Passthrough is not the wrong default mode for a Group, but Affinity has a 10 years old bug corrupting the way it renders a Passthrough Group when the Group has a mask.

[NotMyFault]

47 minutes ago, eobet said:

But interesting... I did not set "passthrough" myself, so Affinity did that for me and that is wrong?

Passthrough is the default blend mode for newly created groups.

[NathanC]

Can confirm this passthrough group mask issue is logged, I've bumped existing issue.

[thomaso]

11 minutes ago, lepr said:

proud of some bugs

need more bugs…