I'm seeing a noticeable decrease in dynamic range when trying to capture a still image of a rendered OpenGL scene that employs alpha blending. I've attached an example patch and two images, one a direct screen grab of the render window, the other a PNG generated with the "exportimage" message to jit.matrix. To my eyes the screen grab clearly has a greater dynamic range.
Would anyone care to take a look and point me in the right direction here? The end goal is to be able to capture pixel accurate still captures of my rendered scene.