Re: Screen versus Booth Color Temp
Re: Screen versus Booth Color Temp
- Subject: Re: Screen versus Booth Color Temp
- From: tflash <email@hidden>
- Date: Mon, 11 Dec 2000 15:11:59 -0500
Hi Jeff,
As I did not have the luxury of conducting my informal test on a dimmable
viewing booth I'm curious. If you average out readings taken within the
booth with an incident light meter what do you get for an f-stop at say
1/60th sec ASA 100, after you've dimmed the booth to match your screen? What
do you get as a reflected reading off bright white paper (do you have a spot
meter?) I'm hacking a viewing booth with lightbox replacement bulbs until
funds arrive.
I don't know which measuring device you trust, but 5250 vs 5400 is a pretty
fair match, as my monitor (Lacie 22 blue) will vary by that much across the
screen.
Todd
>
> I did a very informal test, but you decide if it's relevant. I'm a
>
> photographer, so I have a Minolta IIIF color meter - very common to film and
>
> still photographers. I took readings inside a Graphiclite view booth (non
>
> dimmable) and temps ranged from 6000K to 5000K depending on placement. On My
>
> Lacie 22 blue, which I calibrated/profiled yesterday to 6500K gamma 1.8, I
>
> create a white document in Photoshop 6, and fill the screen with it and
>
> measure various points across the screen. Temps range from 5600-5730K. I did
>
> the same test with my Minolta IV light meter. I won't get into specifics
>
> about shutter speeds and ASA, but the brightness of the incident light
>
> inside the view booth (at the juncture of the backstop and the bed) was 2
>
> full f-stops brighter than what I measure off that above mentioned white
>
> screen. If I were smart I would have put a bright white sheet of paper in
>
> the booth and read the light reflected off it, which might have yielded a
>
> more meaningful number, but this was an informal test.
>
>
>
> Todd
>
>
>
>
I have econducted the same test. My readings using a Minolta IIIF and my
>
dimmable GTI
>
Booth set to approximate similar brightness yielded:
>
>
Electron Blue 19 monitor calibrated to 6500K w/ Prove It: 5250K
>
GTI Booth: 5400K
>
>
I have cheated my monitor up a bit to match the booth with the hardware
>
controls. I'm
>
glad to know I wasn't the only one with this discrepancy! Which do I believe:
>
the
>
Prove It software or the color meter? Any comments would be appreciated. I am
>
sticking
>
with this current tweak for now as it appears to work well..
>
>
Jeffrey Stevensen
>
email@hidden
>
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