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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
Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases
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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). 

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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?

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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
Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases
PC:
    Desktop:  Windows 11 Pro, version 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 

    Laptop:  Windows 11 Pro, version 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU.
iPad:  iPad Pro M1, 12.9": iPadOS 17.4.1, Apple Pencil 2, Magic Keyboard 
Mac:  2023 M2 MacBook Air 15", 16GB memory, macOS Sonoma 14.4.1

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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.

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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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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