colour cast (on CCD?)

[bob]

Any help please!
My images have a (very slight) yellow cast on the left half of my images - most noticeable on studio work. I tested to see if it was unbalanced colour temp of my lights, but it's not. Almost certainly a CCD problem - used the white card test and opened file in Pshop using auto levels to show pixels like golf balls and the predominant colour on the left half is yellow, but not on the right side. Any help would be very much appreciated.

Cheers


bob

[lightwrangler]

I'd like to help, but I need to see a picture in order to make a comment. Can you post something?

[bob]

To Lightwrangler - thanks for your reply. Here is a post of a white card test shot, with auto levels applied for exagerated effect. Ignoring the dust spots, you can see the colour-shift from left to right.

I've tested using different lenses, light sources, exposures etc. and they all do the same thing (relatively), which leads me towards a CCD problem. What do you think?

[bob]

Sorry - that didn't work! How on earth do you attach an image to a message??

BOB

[Swampy]

Originally posted by bob
Sorry - that didn't work! How on earth do you attach an image to a message??

Bob - when posting, you should see a section that is marked "Attach File" in the left column of the reply page. To the right of that, click the "browse" button and find the picture you want to attach. Make sure you scale it down though since maximum size is around 500k.

Bryan

[Tom V]

If you "Preview Reply" you lose the link. After you "Preview Reply" attach (or reattach) your image, save changes, and then "Submit Reply."

[lightwrangler]

Just a thought or two until I see a shot.

Does this colour cast happen on daylight pics as well as strobe? Is this a studio only situation? Could flare be an issue? (I know that you are trying different lenses).

I only ask because I once had a lot of magenta cast with a Kodak 420 camera, but only in the studio. It turned out that I was getting flare from reflector fill, but only in certain positions. Also it happened on high key bright background shots - but only occassionally. It seems that the light must strike the chip at just the right angle to have this happen and that angle changes with lens and lighting setup. It took a while to realize that this was flare, because it happened in situations that wouldn't normally have that problem.

But then again it could well be the chip, so when you get it sorted out, send us a photo.

[bob]

Thanks chaps - hope this one works.

I haven't done a specific daylight test, but the problem would not be as noticable, as there is so much else going on in the outdoor shots. Looking at some existing shots, I would say that the (very,very slight) cast is there - but maybe only a photographer would notice it!

I don't think it's angle flare, as it's always on the left-hand side of the image and even I change lighting set-ups occasionally!

Anyway, have a look at the attached image and thanks to you all once again.

BOB

[bob]

Whoops - sorry! Hope you're all on widescreen . . .


BOB

[Tom V]

If you eliminate the possiblity of flare, lens, or subject matter problems - what else is there?

Bad camera and/or sensor.

I read somewhere that a not-too-uncommon problem with the S1 was that some of them had a color cast on just part of the image. The S2 was to put that problem behind them, but apparently, it still might be around. It sounds like you are having the same problem some of the S1s had.

Call Fuji.

P.S. (edited Jan. 20, 2003) Bob's camera with the color cast has been revealed as a Fuji S1. This color cast problem is not a problem with the S2! - keep reading below to see how this thread turns out!

[lightwrangler]

I'd like to add something else, but I'm stumped. I agree with Tom - call Fuji.

Best of luck!

[bob]

Thanks for the replies - I'll keep you posted.
By the way, the camera is an S1, but I didn't realise they had colour problems

Cheers

BOB

[Tom V]

Bob,

I didn't realize you had an S1. I just did a Google Web Search for " Fuji S1 "color cast" " and found a link to the article I read about this problem in.

http://www.ddisoftware.com/reviews/s2/

It is an early review of the S2, and mention is made of the S1 color cast. The comment is in the "Color" section of the review.

To quote:
<<Some Fuji S1 owners might be aware of a problem that plagued some of the early S1 cameras (I believe Fuji fixed the problem at some point in the S1 manufacturing). The problem manifested itself as a non-linear color cast in images, most notably, a green color cast visible in the upper left corner of images. At the time I owned my S1 camera, it exhibited this problem which made getting good color across the frame difficult in some situations. I'm happy to report that so far, the S2 doesn't seem to have a hint of this problem.
>>

[bob]

Tom

Thanks for the info - sorry I didn't make it clear it was an S1. I'm debating whether to upgrade to the S2 or wait for the next generation (S3?).
Anyway, thanks again to everyone.


BOB