Strange Lens Color Cast issue
I shot images into 3.8.7. with a Mamiya 645 and P45+, with totally neutral flash light.
On the preview I saw a magenta/green cast, as if the program had an old LCC correction activated.
However, there was none selected.
I decided to deal with the issue later and kept on shooting.
When I imported the images into Capture One 4, the lens cast continued to appear!
I have no idea how to get rid of it - the LCC is set at "none".
On the preview I saw a magenta/green cast, as if the program had an old LCC correction activated.
However, there was none selected.
I decided to deal with the issue later and kept on shooting.
When I imported the images into Capture One 4, the lens cast continued to appear!
I have no idea how to get rid of it - the LCC is set at "none".
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Lens cast is caused by the lens and is independent of lighting scheme used. Because None is selected in LCC, no corrections are being applied, therefore there is lens cast in the image. To fix it, use the same lens and back and follow the instructions on page 102 of the CO5 user guide and 90 of the P45+ manual. 0 -
No, there is NO lens cast in the lens.
I have shot with view cameras long enough to tell when there is.
This was the 80mm Phase One lens, and the images are perfectly neutral when shot into Capture One 4.
So this is definitely a software issue: the lens cast I am seeing is Capture one 3.7.8. applying an old LCC correction to a neutral image.
But I can't remove it since the LCC field says none selected.
Question is how I can lose that information, because the cast maintained after I imported the images into 4.
I thought that I would lose the image settings and thus the faulty LCC by doing so.0 -
[quote="Jon" wrote:
"Lens Cast" ist actually sensor cast - the same lenses on Kodak or Dalsa sensors show totally different kind of color cast.
Lens cast is caused by the lens and is independent of lighting scheme used.
Only using a center filter "lens cast" may be introduced in some cases (from blue to yellow).
Too, sensor cast is not totally independent from the lighting source. LCC-shots taken during the shooting (so in the actual light) are often more accurate than presets stored from prior shootings.0 -
All this doesn't make it less puzzling how the same camera with same lighting setup gives me clean images with no cast when I shoot onto the CF card or into another program. 0 -
[quote="thowi" wrote:
[quote="Jon" wrote:
"Lens Cast" ist actually sensor cast - the same lenses on Kodak or Dalsa sensors show totally different kind of color cast.
Lens cast is caused by the lens and is independent of lighting scheme used.
Only using a center filter "lens cast" may be introduced in some cases (from blue to yellow).
Too, sensor cast is not totally independent from the lighting source. LCC-shots taken during the shooting (so in the actual light) are often more accurate than presets stored from prior shootings.
Just going on what Joris posted in the first posting stating that the images showed color cast in 3.7.8 and then in 4 as well which spells out textbook lens cast. And yes the main contributing factor to lens cast is the lens itself. Different CCD will interact differently, however ultimately the angle of light form the lens is the primary cause. Lighting itself has little effect on the LCC because you are diffusing it completely in the LCC shot. What does matter is lens position. On a MF camera there is a slight change between close focus and far focus, but it is minor. On Large format it is important to do the LCC right away because of the different positions of the lens due to focus, rise/fall, swing/tilt have a more pronounced effect.
Based on the rest of the information you have provided us Joris it is clear that there is more going on here, please make a case so we can see some images and get to the bottom of it.0 -
OK, will create a case.
I am well aware of the procedure with view cameras, since I use one regularly.
The Phase One body with standard lens should not be giving any noticeable lens cast at all.
As I have stated already, I got neutral images on Monday, and neutral images on Wednesday, just not on Tuesday.
Same light, same studio, same camera.
Is there a way to "strip" the raw captures of all information (EV, contrast, saturation settings etc.), so I can import them into a new session and start from scratch?0 -
[quote="Joris1" wrote:
Is there a way to "strip" the raw captures of all information (EV, contrast, saturation settings etc.), so I can import them into a new session and start from scratch?
The raw files only contain White balance info that is set at the time of capture, after the raw file is created we don't touch it. All other settings are stored in the Capture One (4/5) and Capture One Settings (3.7) folders.0
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