Left Toolbar > Compose Nodes > Point Sample Image
The Point Sample Image node allows you to extract the rgbo value of an image selected position.
input
Img 1
output
Position 0, 0. rgbo: r: 0.77, g:0.07, b:0.04, o:1
On the left toolbar choose Compose Nodes > Point Sample Image
Drag the Point Sample Image icon into the Node Graph.
Connect the output of an image node into the image input.
set the position and the radious of the area to be evaluated
image 1
rgbo
Position Select the position of the area to be analized. Default: 0.00
Radius Select the radious of the area to be analized. Default: 1 px.