Problem using brush in Photoshop 2025

[Lisandra28221503och8]

Hi everyone,

I'm quite expert in Photoshop but having a weird issue for the first time since a few days...

FYI: I'm working on a MAC, on the last version of Photoshop.

Everytime I use the brush on the mask, first problem is it only works with some trasparency instead of plain colour(I already checked the opacity of the layer and on the top bar menu), so for example when I use black to erase the part of interest it's not erasing fully due to the transparency. The second issue, still while using the brush in the mask,  is that when I click every single click it's switching from white to black to white and so on. In the left instrument menu the colors ar not switching (black stays as foreground and white as background). Both these problems happen also when I use the brush on a normal layer (and not on the mask). I'm sorry I hope I was clear enough, I am attaching a video to help you better understand what I mean. Any help will be fully appreciated, thank you. 

Lisa

[c.pfaffenbichler]

Could you please post screenshots with the pertinent Panels (Toolbar, Layers, Brush Settings, Options Bar, …) visible? 

Is »Color Dynamics« checked? 

[Lisandra28221503och8]

Hi, here are the screenshots. Yes, color dynamics is checked..

[c.pfaffenbichler · Accepted solution]

Yes, color dynamics is checked..

But why? 

Have you tried unchecking it? 

Edit: To demonstrate the effects of Color Dynamics settings: 

[Lisandra28221503och8]

OK, this worked, I thought it was like that by default since I never touched it..

Thank you very much!

[c.pfaffenbichler]

Maybe you selected a Brush that utilzes that setting and afterwards changed the brush-tip without directly selecting another Brush. 

The various options available for modulating/randomizing Brushes can be interesting, but mainly for illustrative work, I guess. 

Still, if you ever have a lull at work, you might try to play around to get a feeling for the possibilities. 

https://helpx.adobe.com/photoshop/using/adding-dynamic-elements-brushes.html

[Lisandra28221503och8]

Great! I'll give it a try, thanks a lot for your help!