I haven't used the bloom in C2, but generally for consoles bloom is a render pass at half, or less, of the resolution (faking a blurrier image without having to do any blur processing), and only drawing the lighter pixels. A fun way to replicate this in a program like photoshop is to duplicate a screen grab, shrink the image to 25%, scale it back up to original size, then bring it over to the other image and set the layer mode to "screen." Try it out and see if it looks like your desired results with the C2 settings.