Jump to content

Pixel Tool Protect Alpha

Recommended Posts

Hi MousePods,

It is missing from the iPad version, the help you linked to is for the Desktop version of Affinity.

I'll get this logged as myself and QA can't see why it would be missing.  Hopefully this is something the Dev team can get added 

Share this post

Link to post
Share on other sites

Hi guys, I know this is a little off topic, but I need a primer about what “Protect Alpha” means, and how it becomes necessary.  Is this peculiar to vector work?  I think I understand the basics about Alpha.  Can you refer me to any material I can read on this topic, please?



Share this post

Link to post
Share on other sites

Hi Lionel,
You will find this option in some pixel tools (Paint Brush Tool, Pixel Tools). It simply protect the alpha from being touched/painted. For example create a new pixel layer, select the Paint Brush Tool, set the color to Red and paint a medium filled circle in the middle of the document. Now change the colour to Blue, tick Protect Alpha in the context toolbar and paint over the red circle you draw earlier making sure you cross its boundaries. Notice the tool only paints inside the previous area painted in Red. The transparent area around it is not touched by the Blue colour you are painting with. That what Protect Alpha does - it doesn't let you touch/paint on non-painted/transparent areas.

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


Important Information

These are the Terms of Use you will be asked to agree to if you join the forum. | Privacy Policy | Guidelines | We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.