Steve
First of all , thank you for responding .
I have no MAC BETH color checker , but what I have and also used for comparison is an "expodisc" white balance filter and a SEKONIC COLORMETER C-500 , set to digital when measuring .
I know , that human beeing have different ability of regarding colors .
But the yellow bias I still can see after a number of "tricky" manipulations in PS is also seen by others .
Alloy and blank metal surfaces are very good candidate to see this yellow bias . I have a shot here from a vintage HASSELBLAD with an aluminium lens barrel and a KODAK hood . Same material .
But even if I would insert the image in this forum , you would not see the bias , because a resolution of 72PPI and a width of 500 pixel looses the image information .
Regards Jürgen
Jürgen:
My initial response would be that using an ExpoDisk could have any number of color biases, depending on the product you're shooting with. It's not my understanding that an ExpoDisk is working from strictly a particular neutral standpoint.
When I say that I'm not seeing color biases in Hasselblad products, I'm saying when neutralizing with a product designed to read spectrally neutral (or close to it), I am not seeing any color bias, at least none over the whole image and the colors are as accurate, if not more so, as any other product I've sold.
Otherwise, if you are using the daylight canned white balance, shady, etc, you can see biases. If you're measuring color temperature and you're at 5500, and then you set to daylight (which reads 5500 in Flexcolor), it may have a bias, and if so, that could be a situation where your back would benefit from a re-calibration. But its also possible that even re-calibrated, it may not render exactly as the numbers would indicate.
The easiest way to establish non-biased colors is to manually capture a neutral grey card with the camera via the "manual" white balance mode, rather than setting it to "daylight, cloudy, etc".
Steve Hendrix
www.ppratlanta.com/digital.php