The "camera response function" refers to how the radiance arriving on image film/CCD, after
passing through the lens, is transformed to actual pixel "brightness" values. The easiest and
usual transformation that we apply is the simple brightness+gamma. But in practice, where
photo cameras are involved, a more complex formula takes place usually "coded" from
manufacturer themselves in order to compress a high dynamic range image into a low dynamic
range (usually jpeg) photo.

What the above simple means is that users can now enjoy some realistic non-linear display of
the results - other than standard "gamma" - easily selectable from a drop-down list that
makes the final image matching better the image coming from a real camera.

Here is a series of images that were produced from quick selection in the darkroom panel.
First is the normal image as displayed using Gamma 2.2, which we include for reference.

Next, is the same render using Agfachrome-rsx2-200CD response function. It has much
contrast but it is also much darker.

A result that has more contrast than normal but uses the black & white film Dscs315B1
response function.

Finally, including yet another response, the Portra-100TCD, a really nice one. Here, we have
also added some strong glare to make the image even more "sweet".


A complete list of response functions will be available with next upcoming revision to "play"
with. We will be happy to see your comparisons and preferences.

best regards

nice addition!

Yes. Excellent feature!!!

Nice will this be available in the next release?

EDIT: I'm downloading it right now... you guys don't know how to stop, do you

I really love the glare option.

Here's a little video with each blades test with a little transition i've made :



or on vimeo


5 blades, 6, 8,12 then radial one with 200%.

(I also love that Renault Megane with the orange ^^)

I like this addition to the engine, good choice and work implementing it.

/ Magnus