If you have encountered any,could you comment on any color shift issues that may
or may not occur when you use your H3D in conjunction with a shift enabled camera
such as the Alpa being discussed.
I was able to test briefly an H39 with a Hasselblad ArcBody using a 45mm lens and
experienced quite severe color shift and,while I am very familiar with Flexcolor as I own
an Imacon 848 scanner,I could not find the method for dealing with this cast as I would
with the LCC feature in C1 with Phase backs.
I encounter colorshift with the Hasselblad back on the ALPA similar to that of the Phase P45. With the HC lenses I see no color shift even with the 35mm lens.
Hasselblad calls their correction process Custom White".
The Custom White is a button located just to the left of the exposure meter indicator in Flexcolor 4.6.4.
There is also a chromatic aberration adjustment button that eliminates color fringing.
All in all I really like the newest Flexcolor.
Here is the Procedure for Custom White:
Using Custom White
Using very wide angle lenses or extreme angles of shift on technical cameras can sometimes lead to colour casts in areas of the image
which are difficult to correct through conventional neutralization.
This is caused by the extreme angle of light rays hitting the surface of the CCD.
It can easily be corrected by performing a Custom White Calibration.
To create a Custom White follow the steps below...
1\ Without making any changes to lighting or exposure capture a uniform white board which must fill the frame of the image. If this
is not possible then use a heavily opaque filter in front of the lens.
2\ Click on Custom White found in the Exposure dialogue window...
3\ Next click on Use Current Capture. A new White Calibration will be built. The text Active will also appear in the Exposure
4\ Make another exposure and the colour cast should be removed. It may be necessary to make a further grey balance.
5\ To reset to factory conditions either quit and restart FlexColor or enter the Custom White menu and click Reset.
NB – The Custom White is ONLY applicable for the image that it was built for. Therefore if you change lighting, set or
exposure you must perform a new Custom White.