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Hello Glenar, Overlay mode for brush is very important and I came across your topic while searching for a solution. I am sure many others will have come across this situation during the initial learning process . So I thought of adding what I learned during the search for a solution. Thank you for the acknowledgement.

The above is possible through the following steps. 1.place cursor on the desired mask as above and select it. 2. come to channels panel and keep cursor on the "Mask Alpha". Right click mouse. Select "Create Greyscale Layer". 3. Another layer will be generated below the (Mask) icon above. Delete the (Mask) layer as it is not required now.The name is (Pixel). In this layer, brush will work in overlay blend mode as desired. After completing the edit, go to top left of screen and click Layer. Scroll down and click "Rasterize to Mask". Now the (pixel) icon will become (Mask). Thats all.

I had the same delete problem. The selection was not getting deleted while pressing the delete key. While trying various things, I noted that the four pen next to the eye in the channels tab should be white. If it is grey, the selection will not get deleted even if del key or CNTRL X is pressed. Click on the pen and eyes to make it white. Then press DEL key or CNTRL X. THen the selection gets deleted .

I came across Affinity Photo software accidentally two days ago while browsing the net for something related to photography. In fact I have always wondered why no software similar to PS is available at an affordable price. When I saw AP in the net , I immediately read some quick reviews and browsed through the Affinity website. Then I downloaded the trial and within 10 minutes of trial, I ordered and purchased through the net at 30% discount (discount will expire in 5 or six days). For the price, there is no need to think a lot, it can be bought straight away. I have been using for six years, Photivo, Rawtherapee, Darktable, GIMP etc. Affinity Photo is a boon to enthusiasts and hobbyists like me who does not make money from photography but want to use professional quality processing software. I immediately called another friend of mine to order AP before the discount expires. I greatly appreciate the enormous work done from scratch by Serif company to bring this software in a short time of 4 or 5 years at such an attractive price. I also wish the team great success in ongoing and future work. By profession, I am an electronics engineer with 34 years of experience in various areas of design and manufacturing, presently working in the field of SMD manufacturing process development and quality in aerospace and defence products used in water, land, air and space. My hobbies include general photography, macro photography with microscope objectives, astronomy, ham radio, playing musical instruments and flute making for personal use.