SDFImage has section Material, right now it only has field to reference existing material, and plus button to create new sdf material.
All white layers images and material
Images on scene share on material, it allows to unify their style.
Adding dark shadow
First let's change shadow color, since all images has white color on each layer on component it allows to fully control color from material.
Changing main color
Enabling second outline layer
Material features second layer for outline, this layer has its own Color, Width, and new property Softness.
Increased softness
Here Softness is increased and edge of second layer became blurred.
In SDFImage,Outline Width can be setted to 0.5 which means outline will spread out directly from image edges, this is how first layer can be hidden. Alternatively first layer color can be same as second, so differences between them won’t be noticeable.
Shadow layer enabled
Except from color, shadow also has softness, for this example Outline in SDFImage is disabled.