In order to add bloom in Cycles you need to use the “Glare” node in the compositor. Switch to the compositor window, tick the box for use nodes at the top of the screen, then pipe the output from your render layer node into a glare node and then pipe that to a “viewer node” and the “composite” node. Then hit the “Backdrop” button at the top of the screen to see what your viewer node sees directly in the composite window, or you can pull up your image viewer and change the view to the “viewer node” this will show you the same thing in a separate window. Now render the image to place the render in the image buffer, now it should appear and you’ll be able to adjust the glare node till it looks right. Try the different settings on the glare node for some cool effects! Hope that helps 🙂
