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thomaso

Stroke :: Blend mode 'Erase' – not affecting underneath??

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Applied to a layer the blend mode "Erase" affects the object itself + layers underneath, too. Applied to a stroke it seems to affect only the object itself. – Is this a feature or a bug?

In this sample I try to erase an area around the rectangle form the circle. While all blend modes do affect the circle, the "Erase" mode does not.

1893632676_strokeblendmode1lighten.jpg.1c2ab5a0343568b755801a931083d734.jpg

161221000_strokeblendmode2erase.jpg.5923a29411b56963d2035ec5cb717bf1.jpg


macOS 10.12.6,  Macbook Pro 15" + Eizo 24"

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Similar? – Different to your layer mode example I am not able to make a stroke's "Erase" mode affect any content underneath, regardless whether grouped or not.


macOS 10.12.6,  Macbook Pro 15" + Eizo 24"

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Confirmed,this should be listed as a bug


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Win10(1903)Home / Photo / Designer / Publisher & latest (beta) versions

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Or they just forgot to remove it from the list. In the fx outline there is no erase option.


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16 minutes ago, dutchshader said:

they just forgot to remove it from the list

That wouldn't make sense. Cause it is a feature nevertheless – I just wonder what of it is "by Design" in the meaning of intentionally / in purpose.

For instance this use of "Erase" for the stroke is a nice option, where it appears correct that the object underneath is NOT influenced:

635338507_strokeblendmode2erase2.jpg.bab5a4170d201621da665f0d24e42586.jpg


macOS 10.12.6,  Macbook Pro 15" + Eizo 24"

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33 minutes ago, dutchshader said:

Or they just forgot to remove it from the list. In the fx outline there is no erase option.

I once mentioned this in a post, why is there only an erase blend in the layers panel?
One should think that this should be available in all blend mode dropdowns


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Win10(1903)Home / Photo / Designer / Publisher & latest (beta) versions

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8 hours ago, thomaso said:

For instance this use of "Erase" for the stroke is a nice option,

Erase is erase/delete. The None mode (if it existed) would be more suitable for your use.


Affinity Store: Designer 1.7.3.481, Photo 1.7.3.481, Publisher 1.7.3.481.
Windows 10 Pro, Version 1903, Build 18362.418.
Dell Latitude E5570, i5-6440HQ 2.60 GHz, 8 GB, Intel HD Graphics 530, 1920 x 1080.
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Pšenda, there is kind of a "None" mode for a stroke: it is to assign no color (the Ø swatch icon). But for this situation it isn't useful because multiple strokes always start from the line center to the outside (according to their stroke width). So, a stroke "None" would NOT delete the stroke(s) underneath – which actually is the nice feature of "Erase" mode – but result in a plain stroke only.

Actually in this topic I wonder whether there is a chance to use a stroke in "Erase" mode to visually delete parts of a different object underneath. (Like it works with a layer's mode, but for the entire layer only)


macOS 10.12.6,  Macbook Pro 15" + Eizo 24"

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19 hours ago, thomaso said:

a "None" mode

@thomaso, you're right. "Blend mode" is the blending/interacting between two layers/objects. Therefore, the "None" mode is stupid, and it should be possible to make a line with no color.

 

19 hours ago, haakoo said:

this should be listed as a bug

I think it's not a bug, and it does right what Thomaso describes - "object underneath".

Mode Erase delete all underneath layer/object "within" group, and multiple stroke part in Appearance panel is the "group" of properties/parameters on the single stroke.

 

10 hours ago, thomaso said:

Actually in this topic I wonder whether there is a chance to use a stroke in "Erase" mode to visually delete parts of a different object underneath.

I think you have to use a specific object/stroke, not one element of the stroke property group.


Affinity Store: Designer 1.7.3.481, Photo 1.7.3.481, Publisher 1.7.3.481.
Windows 10 Pro, Version 1903, Build 18362.418.
Dell Latitude E5570, i5-6440HQ 2.60 GHz, 8 GB, Intel HD Graphics 530, 1920 x 1080.
Dell OptiPlex 7060, i5-8500 3.00 GHz, 16 GB, Intel UHD Graphics 630, Dell P2417H 1920 x 1080.

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19 hours ago, haakoo said:

I once mentioned this in a post, why is there only an erase blend in the layers panel?
One should think that this should be available in all blend mode dropdowns

As I described in the previous post, using Erase in fx makes no sense. It would delete something inside the group, ie only in relation to the object to which fx is joining - not to any other object, which you would probably need.

The result - an object with fx parameters, is applied to another object, which Erase already allows.


Affinity Store: Designer 1.7.3.481, Photo 1.7.3.481, Publisher 1.7.3.481.
Windows 10 Pro, Version 1903, Build 18362.418.
Dell Latitude E5570, i5-6440HQ 2.60 GHz, 8 GB, Intel HD Graphics 530, 1920 x 1080.
Dell OptiPlex 7060, i5-8500 3.00 GHz, 16 GB, Intel UHD Graphics 630, Dell P2417H 1920 x 1080.

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