I've been using the gradient tool to horizontally fade some images to transparent in Gimp v2.8.14.
I just select the layer that I want to fade (usually it's the only layer in the image), select the gradient tool with mode:normal, opacity:100, gradient:FG to Transparent, shape:linear, repeat:none and drag a line from one end of the image to another.
It's been working fine, and now suddenly it's stopped working. When I drag the line across the image now, it always fades to the foreground color instead of transparency. If I hide the layer from the layers panel, the image disappears and shows the checkered transparency panel underneath, so there's definitely no foreground layer hiding under it.
Best Answer
It looks like I had to add a layer mask to the image that I want to fade (I wasn't doing that before though). Anyway, if you right-click the layer in the layers panel, select
Add Layer Maskand chooseWhite (full opacity)or whatever that option is called. Then use the gradient to fade the image.