color issue

[Nano-25]

please see the attached picture showing the color that not smooth!!!
i am a new with this camera ...
nikon 28mm f/2.0
CF with redcode28
BD16
is it from the lens? or redcode? or it is normal with red camera?


Best Regards

 

[Graeme Nattress]

How are you creating the image - how are you decoding the R3D file?

Graeme

 

[Nano-25]

uncompressed 10bit hd
apple proress hq
.......

 

[Graeme Nattress]

Which application did you use to generate the quicktime movie? Try spitting out a 16bit tiff from RedAlert and seeing how that looks.

Graeme

 

[jimhare]

I've noticed that uncompressed and prores QT can have color banding, where TIFF and DPX are clean.

I have a feeling it has more to do with QT than RED but would like to know more.

 

[Graeme Nattress]

Yup, could be how the QT is being displayed, and, presumably the decimation to 8bit for display.

Graeme

 

[jimhare]

Hey Graeme, if the display is 8-bit, why don't we see banding/Posterization in the TIFFs, only the QTs?

Jim

 

[Graeme Nattress]

Wish I knew. You never quite know what Quicktime does on the route from RAW data to screen. You can only control it so far, and we do, and we ensure all the stuff we can do is right....

Graeme

 

[jimhare]

Cool, thanks for that. With that in mind, are you saying that the banding is just a display issue and not necessarily in the actual QT file? In other words, I would prefer to use QT to move things around but worried that I was creating an inferior file as a result.

Any thoughts?

Cheers,

Jim

 

[Graeme Nattress]

Well, I don't know because the only way to view a Quicktime is to view it... And most monitors are still 8bit. It's not an easy question to answer.

Graeme

 

[jimhare]

I guess I could take an posterized QT and save a still as a TIFF and check.

 

[Nano-25]

I have same problem when i use tiff and dpx also when i watch it on normal tv !!!

 

[Uli Plank]

Please consider effects of software calibrated monitors as well – they use LUTs in the computer's graphics card to compensate aberrations in the monitor, which can cause banding as well (if you don't switch it off, QT player is Color Sync aware).
To be sure, use a monitor calibrated in it's internal hardware.