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Paint brush not working for tonal manipulation


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Hi,

Trying to follow along with the Affinity Photo Workbook and am having trouble with the paint brush tool. Specifically, page 197:
1. On tools panel, choose paint brush tool

2. Set hardness to 0%, width to 1000px

3. set color to pure white.

4. paint over wooden structure

5. switch to black color

6. paint over sky to darken

This doesn't work for me. There is no visible difference or indication that this changes anything. I created the pixel layer as indicated on the previous page. I've attached a screenshot.

Thank you for any suggestions!

Screen Shot 2019-08-06 at 2.11.20 PM.jpg

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By the way, I figure it out. If you look at the image I attached earlier, you will see the context menu bar has a double arrow at the very top right. Well, I clicked on that, and saw that 
"Protect Alpha" was checked. I unchecked it, and all works as it's supposed to now.

Hope that helps someone else in the future.

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