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Pure white Alpha mask changes blend ranges?


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This is for Affinity Photo.

If one is to use blend rages, I can adjust the sliders to get what I want.

Why is it that when I add an Alpha mask (pure white) the entire image changes? This shouldn't happen if alpha mask is pure white no? There is no reason?

You can't workaround it either by putting blend ranges into a group and masking the group.

Is this a bug? Doesn't happen in Photoshop. Thanks.

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Maybe explain how the file is laid out or upload it 

iMac 27" 2019 Somona 14.3.1, iMac 27" Affinity Designer, Photo & Publisher V1 & V2, Adobe, Inkscape, Vectorstyler, Blender, C4D, Sketchup + more... XP-Pen Artist-22E, - iPad Pro 12.9  
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On 10/12/2019 at 3:51 AM, km.au said:

Why is it that when I add an Alpha mask (pure white) the entire image changes?

What specifically are you adding a mask to? What does it change & how does it change it?

All 3 1.10.8, & all 3 V2.4.1 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7
Affinity Photo 
1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7

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Ok, here's what I want the blend to look like:

Note the alpha mask is off

439665497_2019-10-1411_23_46-BlendOptions.thumb.jpg.ff0a94b1fa81c0e0eb0f56e14593a190.jpg

 

As soon as I turn a pure white alpha mask on, the entire image changes and the blend is wrong.

 

1555321160_2019-10-1411_24_50-BlendOptions.thumb.jpg.7fa9cd31a0d57edbf0c4636a742ef19b.jpg

 

Just trying to understand how this should occur as an alpha should not effect RGB pixel blend like this?

Untitled.thumb.jpg.bac56bb5dae40e1559f6c06a19639dcd.jpg

 

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  • 4 weeks later...

Is there any update or explanation for this behaviour? 

I simply don't understand why blend ranges should change so dramatically when all one does is add a pure white alpha mask..

 

50128450_2019-11-0819_39_59-AffinityPhoto.thumb.png.39a36f51e3001f34838da8c547d2c136.png

Mask Off

Below Mask on

596780514_2019-11-0819_39_52-AffinityPhoto.thumb.png.f21a2f9140c5488af466cd1b6a28fc12.png

 

Notice the mask completely kills contrast.

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