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Jagged edges when using elliptical marquee


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Doing a very simple selection using the elliptical marquee tool to cut a portion out. The problem is the edges are much more jagged as compared to doing the same function in Photoshop. The rasterize function did not help. I have feather set to zero, but it is also set to zero in Photoshop. I am using the same .jpg in both programs and I am using the same marquee size setting between both programs. Attached are two photos; AF test is the Affinity photo and PS is Pho toshop. I can probably go through steps to refine the edge after the fact, but I would rather have the marquee selection tool have edges similar to what I have been using in Photoshop. I am a rookie with Affinity so it is probably a simple setting I am not seeing. Thanks for the help!

PS Test.jpg

AF test.jpg

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Make sure you are viewing the selection at 100% because anything another obviously constitutes zooming in and will ultimately reveal pixelation.

An alternative to the selection tool is to clip the image using a shape like the Ellipse shape. This has the benefit of being nice and smooth and also easily editable. You create an ellipse shape using the ellipse tool and then place (nest) the image in the Ellipse shape.

788697324_ScreenShot2020-02-24at23_49_50.png.0005c5aecd426563d5e7cf96da8261f2.png

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11 hours ago, NickC2020 said:

The problem is the edges are much more jagged

In my opinion, this is expected and "desirable" because Marque's role is to select the entire existing pixel content.
Therefore, it should not create any smoothing (aliasing) and change the content of the selected pixels. There are other tools, such as masking or clipping, as firstdefence writes.

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3 hours ago, Lagarto said:

depend on the preferred options

Yes, but OP does not mention turning on Aliasing in its contribution. With aliasing off, I expect the selection to be "jagged".

Edit: The Aliasing option does not work as expected.
"Must" be selected before selection is made. If it is selected after the selection is made, it is not accepted - the selection is still jagged.
Maybe that's why @NickC2020image is so jagged.

Edited by Pšenda

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4 hours ago, Lagarto said:

but it is not a non-antialiased selection as the edges do not seem hard

Realy???
image.png.fd4ce5156055f5841aa382d46817c735.png

 

I imagine a smooth selection somewhat differently.
image.png.a19e5364100a904518d1ae6fe07f63f0.png

This is with anti-aliasing off, which seems to me much like the OP image.

image.png.7ec323e0c3939f32a957a2168ffa297e.png

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4 hours ago, Lagarto said:

This is probably by design.

This is possible, but there is nothing in the help about the necessity of choosing before selecting, which is confusing for the user.
image.png.b5431c8eb1bcd659fa39a47eb83b4557.png

English is not my native language, but I would say it is not described correctly.
The above wording suggests that "after" selecting Antialias, applying transparency will smooth the edges of the selection already made.

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Dell Latitude E5570, i5-6440HQ 2.60 GHz, 8 GB, Intel HD Graphics 530, 1920 x 1080, Windows 11 Pro, Version 23H2, Build 22631.3155.
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First off, thanks for the numerous replies, I appreciate it and I learned more.

So it was because I had antialias turned off (default) while it was turned on (default) in PS. Also the fact I didn't turn this on PRIOR to selecting also threw me for a loop. I was always selecting it after the selection. Thanks to @Pšenda for pointing this out! Like I said, rookie mistake by me.

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Hi @NickC2020, I was glad to help :-)

Even if Serif better described it in application help.

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Dell OptiPlex 7060, i5-8500 3.00 GHz, 16 GB, Intel UHD Graphics 630, Dell P2417H 1920 x 1080, Windows 11 Pro, Version 23H2, Build 22631.3155.
Dell Latitude E5570, i5-6440HQ 2.60 GHz, 8 GB, Intel HD Graphics 530, 1920 x 1080, Windows 11 Pro, Version 23H2, Build 22631.3155.
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