I'm working with QGIS 2.18 (windows) and the useful atlas tools. My covering layer is a polygon layer (20 features). My atlas template is composed by 4 map elements representing different images raster (3 multibands) located on the same area.
I use the option proposed in the tab called "object property" to lock the layer and the style of the layer (lock layers / lock style for layers). For each raster, I want to be able to automatically apply and set the raster style and enhance the contrast "local histogram stretch".
I join a screen shot representing my atlas template.
Is there a way to automatically assign a contrast stretch ("local histogram stretch") for all my map elements and for each of my 20 atlas sheet?