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Latitude comparative test and proposal


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#1 Evangelos Achillopoulos

Evangelos Achillopoulos
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  • Digital Image Technician

Posted 26 September 2007 - 05:39 PM

Hello to all forum members

For some time I measure, with a Danes Picta TS28D transmitive step chart various cameras in order to understand their behavior. My study has shown different results of what is the market belief. I?m using an image quality assessment software to analyze results. Probably many of you will be shocked of the results. Never the less, I thing that I have to publish them and learn from the forum collective knowledge.

The software that I use is www.imatest.com and costs 129$.
Many of the big manufactures are using it for R&D purposes.

In the link below are the results of an objective dynamic range comparative test.

http://www.motionfx......son Sep07.pdf

The images that these results have being taken can be given on request because of the huge size that they have.

I would like all of you, to comment the results which are including RED, Cinealta, Varicam, Canon EOS 5D, Leica etc.

The results are very interesting.

I don?t have access to all the cameras available but a 16bit tiff still from a Stouffer T4110 transmitive step chart will be enough for me to run a noise/f-stop analysis and publish it in the forum.

I follow the debate related to how we can have common measuring methods in image quality assessment. My proposal is to use imatest software as a common ground.

If we all use the methods of camera quality assessment that are provided from imatest software, we all, going to have a common ground in comparing image acquisition systems.

Waiting your comments.

Regards, to everyone

Evangelos Achillopoulos
Elec. Engineer
DIT, DI/VFX supervisor

Motion FX Technologies S.A.
62 Amarousiou - Chalandriou &
Dodonis, Marousi, Athens
Greece
Tel: +302106857975
Fax:+302106857824
Mob: +306932834153
lakis@motionfx.gr
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Visual Products

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Gamma Ray Digital Inc

Wooden Camera

rebotnix Technologies

Broadcast Solutions Inc

Abel Cine

Tai Audio

The Slider

CineTape

Metropolis Post

Paralinx LLC

CineLab

Rig Wheels Passport

Media Blackout - Custom Cables and AKS

FJS International, LLC

Willys Widgets

Aerial Filmworks