I would like to set a raster transparency to represent its elevation, so that the mountain tops are opaque and gradually become transparent toward their foot.
Layer Properties - Transparency tab, in
Custom Transparency Options, I found Transparency band and would like to use it.
Problem is, I do not know how to control the transparency according to the band I have just assigned (
Band1 in the above image).
At default setting it gives me an uncomfortable image (right-hand-side; below).
I also tried simple color ramp such as Reds, but the output is still weird.
Question: How can I use this Transparency band function ?
Alternatively, giving a list of transparent pixel seems to work. But I have to give a color range in stepwise manner, and it is far from gradual change I hope to achieve.