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I want to eliminate the a black background bg. of an open book lying on a black ground, so I just have the irregular shape of the open book. I've successfully done this on about 6 of them just like this one, using the wand. I can't (or don't know how to) use the wand on this one because of the B+W image (bottom center) abutting the blk. bg. The wand selection enters the image and I can't seem to get the "wand-subtract" setting to eliminate the inadvertent selection of portions of the image. With the magnetic lasso, I can switch to manual mode right before the problem area, trace the edge of the page across the problem area manually and them resume "magnetic" right after the problem area. When I close the selection, I get the marching ants around the book spread. I choose "invert selection" to select the blk. bg. I hit "delete" (as I do, successfully, with the wand) and nothing happens—the bg is not deleted.

How do I get the bg. of this magnetic wand selection to delete? How come the selected bg of the image does not delete with the lasso but does delete with the wand selection?

thanks,

lettergothic

 m1 Erik Nitsche  Dynamic America 29-Rhine*  1960.jpg

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First, make sure you're dealing with a Pixel layer, not an Image layer. Look in the Layers panel and see how the layer is tagged: (Pixel) or (Image). If (image) you need to rasterize the layer.


-- Walt

Windows 10 Home, version 1903 (18362.239), 16GB memory, Intel Core i7-6700K @ 4.00Gz, GeForce GTX 970
Affinity Photo 1.7.2.471 and 1.7.2.464 Beta   / Affinity Designer 1.7.2.471 and 1.7.2.4464 Beta  / Affinity Publisher 1.7.2.471 and 1.7.2.458 Beta

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thanks for responding, Walt.

The layer in question is a pixel layer. It's simply a 1 layer image that I opened in Af Photo. So, why can't I select the bg and delete it—like I can when I use the wand?

thanks,

lettergothic

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Maybe that AP has identified it as an Image layer (layers studio panel). In that case you can rasterize first (right click on layer in layers studio panel). 


Affinity Photo/Affinity Designer/Affinity Publisher | macOS 10.14 Mojave | MBP13 2013

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2 hours ago, lettergothic said:

The Layers Panel says it's a pixel layer.

Perhaps a dumb question, but have you made sure the pixel layer is still selected in the Layers panel when you hit delete?


Affinity Photo 1.7.2, Affinity Designer 1.7.2, Affinity Publisher 1.7.2; macOS High Sierra 10.13.6 iMac (27-inch, Late 2012); 2.9GHz i5 CPU; NVIDIA GeForce GTX 660M; 8GB RAM
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R C-R,

Thanks for responding.

It's not a dumb question. Thank you for asking.
Unfortunately, for the sake me being able to solve this problem, the pixel layer is—and has been—selected when I hit "delete" . . . 

I attached the image in question to my original post—if that's of any help.

Thanks,

lettergothic

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23 minutes ago, lettergothic said:

Unfortunately, for the sake me being able to solve this problem, the pixel layer is—and has been—selected when I hit "delete" . . . 

I attached the image in question to my original post—if that's of any help.

Can you provide a screenshot that shows the complete Affinity Photo window, including the image and the pixel selection, and the Layers panel? Your original post simply has a shot of the image, not the context of the Window, selection, and Layers panel.


-- Walt

Windows 10 Home, version 1903 (18362.239), 16GB memory, Intel Core i7-6700K @ 4.00Gz, GeForce GTX 970
Affinity Photo 1.7.2.471 and 1.7.2.464 Beta   / Affinity Designer 1.7.2.471 and 1.7.2.4464 Beta  / Affinity Publisher 1.7.2.471 and 1.7.2.458 Beta

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3 minutes ago, lettergothic said:

Great! Good for you! I need help to find out what I'm doing wrong.

Then you really need to provide the screenshot @walt.farrell requested above.


Affinity Photo 1.7.2, Affinity Designer 1.7.2, Affinity Publisher 1.7.2; macOS High Sierra 10.13.6 iMac (27-inch, Late 2012); 2.9GHz i5 CPU; NVIDIA GeForce GTX 660M; 8GB RAM
Affinity Photo 1.7.2.153 & Affinity Designer 1.7.2.6 for iPad; 6th Generation iPad 32 GB; Apple Pencil; iOS 12.3.1

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Usually, I would use the Wand selection tool or do a selection on the most contrasted (for the part I want) of the Channel, and instead of delete, I would create a Mask.

This way, using Brushes or Lasso selection Tool, I can refine the Mask adding or substrating here and there. And this would allow to keep the book cover, not delete it.

 

It's best to keep the original image that deleting part of it, but once the Mask is perfect, you can get back its selection, inverse it and delete this from the image.

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Just a thought to check, Do you have transparent background set? It might be you have a black background and it's actually deleting but not showing as transparent because transparent background isn't enabled.

 


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The brush size makes a big difference - @Armin77's is set to 12 px - anything much bigger causes problems. 


AP user, running Win10

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