Choosing the correct white point

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Pibuz
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Choosing the correct white point

Post by Pibuz » Fri Apr 18, 2008 3:30 am

I don't know if this could be of any use for someone, but i'll post some of my tests about the white point influence on the render. I never cared too much about that, but i always wanted to see the difference between the presets.
After this kind of research, in my opinion the best preset for exterior shots could be the C.

BTW, probably this is only the first of a series of tests, and i don't know yet if the daytime can influence the choice of the white point parameter.

Anyway: the scene was set just to experiment the material settings for the stone Bbb used in one of his last exterior shots; Bbb gave the blender settings, which i tried to transpose into skindigo (quite an easy operation, indeed). All the images are taken from the same position, and at the same time of the day (12:41 of the 25th of september).

The camera parameters are:
ISO 200
shutter: 150
exposure: 0 (anyone could explain me the meaning of this parameter?)
aperture: f/22
autofocus
BiPT - MNCR 1000
Attachments
12-white_F11.png
12-white_F11.png (896.41 KiB) Viewed 2625 times
11-white_F7.png
11-white_F7.png (928.66 KiB) Viewed 2625 times
10-white_F2.png
10-white_F2.png (987.13 KiB) Viewed 2625 times
9-white_9300.png
9-white_9300.png (841.72 KiB) Viewed 2625 times
8-white_C.png
8-white_C.png (987.65 KiB) Viewed 2626 times
7-white_B.png
7-white_B.png (992.07 KiB) Viewed 2625 times
6-white_A.png
6-white_A.png (1016.74 KiB) Viewed 2627 times
5-white_D75.png
5-white_D75.png (971.99 KiB) Viewed 2628 times
4-white_D65.png
4-white_D65.png (946.45 KiB) Viewed 2628 times
3-white_D55.png
3-white_D55.png (948.29 KiB) Viewed 2628 times
2-white_D50.png
2-white_D50.png (996.15 KiB) Viewed 2628 times
1-white_E.png
1-white_E.png (1000.48 KiB) Viewed 2628 times

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alexmeyer
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Post by alexmeyer » Fri Apr 18, 2008 3:39 am

Excellent tests! These should be very useful to anyone.

I always love "warmer" scenes... I usually end up using D65, but it looks like C is pretty similar.
From uncyclopedia.org, on "Elephant's Dream":

"The choice of the title is highly significant, because while the movie does not feature any elephants nor dreams, no one understands what happens anyway."

crojack
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Post by crojack » Fri Apr 18, 2008 5:05 am

really nice and very helpful tests!
I liek C and also the one after that 9300 for a little warmer feel.


I believe, at least in actual photography, that a higher exposure means that more light is let in, like the film is 'exposed' longer to the light.

but I may very well be completely wrong :)

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OnoSendai
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Post by OnoSendai » Fri Apr 18, 2008 5:13 am

'exposure' might be referring to Indigo exposure value (EV) compensation,
which, as on a digital camera, allows you to make the image more or less bright.

jenujacob
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Post by jenujacob » Fri Apr 18, 2008 6:40 am

pibuz,
did u use the violet tone mapper to create the different variants?? or did u render them each with skindigo options?

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Pibuz
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Post by Pibuz » Fri Apr 18, 2008 7:04 am

@ jenu
No violet here! As you can notice in the title of each image, the only thing that changes is the white point setting which you can find in the camera settings tab. :D

jenujacob
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Post by jenujacob » Fri Apr 18, 2008 7:31 am

but by using violet cant we get all these results at one go???? :D or do u think the results vary??
i mean isnt it the great convenience of violet? ;)

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Pibuz
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Post by Pibuz » Fri Apr 18, 2008 7:34 pm

@ jenu
..seems like i have to study Violet a lot more!
Do you mean that, starting from the same igi file, Violet can output all these images without rendering it again?

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jurasek
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Post by jurasek » Fri Apr 18, 2008 8:05 pm

Pibuz wrote:Do you mean that, starting from the same igi file, Violet can output all these images without rendering it again?
yes sir;)

greetz,
jur

jenujacob
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Post by jenujacob » Fri Apr 18, 2008 8:19 pm

yup thats rite pibuz! i thought u knew this and posted this to see if there were any variations in the output! :lol: :lol:

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Pibuz
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Post by Pibuz » Fri Apr 18, 2008 8:21 pm

:oops: :oops: :oops:
oh...damn....
sorry guys... :roll:

crojack
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Post by crojack » Sat Apr 19, 2008 4:51 am

don't be sorry, now you can take one of the igi files and see how accurate Violet is :P

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Pibuz
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Post by Pibuz » Mon Apr 21, 2008 12:43 am

:oops:
..THANKS for your patience.....

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beta
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Post by beta » Mon Apr 21, 2008 12:48 am

:lol: this is very usefull to see the effects of all the white balances thx pibuz...if u didn't post this i would had to make all the tests :x

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