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selecting based on color and "edges"

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I'm trying to isolate a shape from the background and the selection brush tool does OK until it suddenly selects the entire image!

If I can see the change in tonality of one shape over another, why can't Affinity "see" it, too? Same with the flood selection tool. It's almost like these tools are blind in a manner of speaking, but both the software and my aging eyeballs are both seeing whatever the video card throws to the monitor.

Is there some level of selectivity besides "all or nothing?"

thank you!

 2012 Mac Book Pro 12”, 8GB RAM, Mojave  |  2017 iPad Pro 12.9” 256GB, iOS 12.4

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With the Flood selection tool, select add mode then try left-click and hold and drag down slowly until it starts to select things you don't want, then pull back slightly, then do the same again in the area you want to select until all of the area is selected. 

Upload a screenshot or the original image to give us an idea what you're trying to select.

iMac 27" Late 2015 Fully Loaded, iMac 27" Mid 2011 both running High Sierra 10.13.6 - Affinity Designer/Photo & Publisher - Illustrator CC, Inkscape, Blender, Sketchup, Pepakura Designer, MTC, Pixelmator & Pixelmator Pro + more... XP-Pen Artist-22E, - iPad Pro 12.9 B|  

Affinity Help - Affinity Desktop Tutorials - FeedbackInstagram & Flickr

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