I have a Panasonic S5 camera with an astro modified filter for night photography (basically it extends a little bit into the IR to capture also the Ha emissions). Due to this, the Auto WB and other WB presets are no longer working as intended. Therefore, I am using one of the user defined WB slots, where I set up the temperature to 3000K and a little green tilt.
However, when the images are displayed in ART, the implicit WB is ‘As Shot’ and it shows a temperature of 2834K and a 0.967 tint (goes towards magenta).
Hi,
“As shot” takes the channel multipliers from the image metadata, as recorded by the camera. The conversion to temp/tint is an approximation, and there are multiple slightly different methods to do it. Also, it depends on the camera to xyz conversion method used (in the case of art, a simple matrix for what concerns wb). It’s quite likely that Panasonic is using a slightly different method, so all things considered I’d say that the values you get are not terribly off…
Bottom line, what you get in “as shot” mode should correspond to what you set in the camera. If you have (visual) evidence of the contrary, I would consider that a bug.
Thanks for the clarification.
I would say that visually, what ART shows with the ‘Default’ processing profile (which includes WB with ‘As shot’) looks similar to what the camera preview shows (as much as the color profile of a small camera LCD can match the one from a Macbook retina display …). I was only a bit puzzled about why the temperature is shown other than 3000K what was set in the camera.
I do not consider this a bug, in the end the WB part is not a science and will be set anyway to whatever value makes things look good.
