Art History brush - Could not rasterize because the pixel data for this layer is not directly edita
I am following a tutorial. I opened a psd with two layers - the original photo and a transparent layer above it, which I am trying to brush on. With the Art History Braush selected, I've seen two turorials that show using a bruah on the transparent layer (so the original layer below is unaffected). I am getting a circle with slash rhrough it and error message "could not rasterize because the pixel data for this layer is not directly editable". I've chosen a brush and foreground color is black, in the Hisotry Panel the original photo has a brush next to it. I've tried "save as", open and re-open, making a snapshot in history panel and putting the brush icon next to it - nothing works. Banging my head against the monitor for an hour. Any suggestions?
