So there is a slight adjustment I’m making to a texture, and I want to be able to see what the hex color code is AFTER I have used a brightness/contrast node/ Is this possible?
Not in the shader editor without a node viewer addon.
You can do it in the compositor.
Use a seperate RGB node and the colour picker to get the values of the background (using the viewer node)
(edit) you do not need to render the image, you may have to click the backdrop button a couple of times for the backdrop to show up.