I have three layers open in Photoshop.
Two are images. One is a text layer.
I flattened and merged the background image which I originally filled with black and applied a gradient to.
I then tried to apply HDR toning but the HDR toning option is greyed out although the Shadow/Highlighting is not.
Why can't I access my HDR toning?
I tried converting it to a smart object and ensuring it's rasterised; still nothing.