White balance problem with Canon EOS 5D Mark II

[esaahonen]

Hi

I didn't find an earlier report of this. My images from Canon EOS 5D Mark II have a white balance problem. All images have significant red color cast, so I have to shoot grey card for almost all situations. Luckily I don't have the "Click white" producing green color cast problem mentioned before. So "Click white" produces about right white balance, but it's frustrating having to use it for images that camera gets the white balance right by itself. In Bibble 5.2.3 same images appear quite right with "As shot"-setting.

Attached is the same image in default settings from Bibble and ASP.

---Esa

[maggus]

Hi,

I´m not a calibration guru and I do not have a real calibrated system, but to me the ASP version looks more neutral, at least if R=G=B means gray and the copy from FF into GIMP did not change it (at least it looks the same in both).

cheers
Markus

[afx]

but to me the ASP version looks more neutral, at least if R=G=B means gray and the copy from FF into GIMP did not change it (at least it looks the same in both).

Funny,
visually I would say the AS version is reddish.
Using colorzilla to check the values, it is clear that the B5 version is bluer and the AS rendition is more neutral.
(using FF on a color managed NEC screen).

But, if these are screenshots, the RGB values are meaningless anyway.

@esaahonen:
Do you work on a calibrated screen? Are B5 and AS using the same screen profile? How where these images created? Screenshot or batch output?

cheers
afx

[esaahonen]

Hi

These images are from Bibble/ASP batch output, cropped and combined in GIMP. I don't know if the forum does something to downloaded attachments but from the original, larger output image (trying to find the most neutral spot in texture) I get readings like r=160, g=161, b=163 for the Bibble image and r=157, g=148, b=149 for the ASP one. So Bibble is a bit off to blue side. but ASP is way off to red. I don't have calibrated system, but from the values above and as the click-white tool in ASP corrects the situation, I think it's not only my monitor/eyes.

---Esa

[maggus]

but to me the ASP version looks more neutral, at least if R=G=B means gray and the copy from FF into GIMP did not change it (at least it looks the same in both).

Funny,
...
But, if these are screenshots, the RGB values are meaningless anyway.
...

Hi afx,

I guess this note goes to me.
In FF I first clicked the attached image to get the "full size", then I <right click>-><copy image> and in GIMP I did <paste as new image>. So GIMP should not have received a screenshot of the FF window, but the image itself ?!
Both, the image in FF and in GIMP look the same.
And the values that GIMP reads from the image match your "funny" observation .... but I´m really not sure now if R=G=B in GIMP on a sRGB image should be neutral ?! Should it ?

cheers
Markus

[afx]

But, if these are screenshots, the RGB values are meaningless anyway.

So GIMP should not have received a screenshot of the FF window, but the image itself ?!

Completely irrelevant.
If the OP posted a screenshot instead of a combined image, then we we would be only able to see his screen rendition which is not necessarily what the files have, so no matter what we read, it would be wrong.

but I´m really not sure now if R=G=B in GIMP on a sRGB image should be neutral ?! Should it ?

I think it should if the original image is read and not the screen value.

cheers
afx

[afx]

I don't know if the forum does something to downloaded attachments but from the original, larger output image (trying to find the most neutral spot in texture) I get readings like r=160, g=161, b=163 for the Bibble image and r=157, g=148, b=149 for the ASP one.

Just to make sure I don't have any interference from the FF rendering I downloaded the file and checked it with PWP.
The readings are similar to what I had before.
So I wonder why your readings are so different.

Could you make the raw file available?

cheers
afx

[AsterixEtObelix]

Just put an additional info to this post.

I am OK with the white balance, even if I had to "fine" tune it for ASP but there is something wired:

If I set to white balance to SUNNY, it gaves me this value
Temp: 4519
tint 20

then if I put set it to "personalized" and set the same value (4519 / 20) it s awful ... so became quite hard quite hard to tune .... for me this behaviour is wired. If i want to all just a bit of red, to the SUNNY, I have first to find another Temp / tint ...