4K / DCP Test Chart "Shirley"

Musicvid wrote on 12/11/2017, 2:23 PM

This little project was prompted by a chat with @john_dennis a few weeks ago.

This is an adaptation of the Dry Creek / Photodisc chart PDI_Target-DCP.

The original chart was adapted to fit both 4K and DCP formats at 2160p.

I am looking for feedback, after which I'll zip it with the license disclosures and make available for download. Note that this sample is being altered by the forum software.

Eventully, this thread should be moved to OT, but will get more initial exposure here.

Oh, it's 8 bit, not HDR.

Comments

wwjd wrote on 12/11/2017, 2:42 PM

ha. that's the exact image I use when doing monitor color calibrations. :) Also loaded onto phone and, shoockingly, it holds up well.

Kinvermark wrote on 12/11/2017, 4:49 PM

Great idea! Is this meant for calibrating a 4k PC monitor or for checking that your "pipeline" to the final output format/device is working correctly?

Some instructions may be required, and a discussion of "gotchas." I noticed that the various sites on-line mention that the monitor needs to be in its native resolution or the results will be wrong. (Confused the heck out of me as I was trying to confirm the accuracy of my brand new, Xrite calibrated 4k monitor and kept getting really wild gammas: I had text scaling turned on.)

Musicvid wrote on 12/11/2017, 8:42 PM

It's too "busy" for monitor calibration, IMO.

Put at the beginning of a project for door-to-door checkpoints.

Here's version 2. Opinions graciously sought.

john_dennis wrote on 12/12/2017, 1:07 PM

It is busy.

The version downloaded from the Magix site is not 3180x2160 or 4096x2160. 

Here is a resource for images that I've only begun to explore. 

I like the different skin tone samples.

I'm less excited about all the clutter in the top half of the photo. Maybe, because I just don't like clutter.

 

wwjd wrote on 12/12/2017, 1:36 PM

yeah, it is not a "calibration tool", just what I use to check stuff. Like the differences in REDS tween the red robot and the frame around it. Also, the light to dark boxes scaled arcoss the middle is handy. That top center multi color blend thingy is available elsewhere on its own, and exposes issues in bit depth really well, and can show you level issues.

Can you make a 10 or 12 bit version of it? Also, the Kodak Gray section seems a little dark. I'm not on a calibrated monitor at work here, but compared to the original, I can see brightness changes down to 19. are the level 16 to 235 or 255 or what?

Not sure this one hasn't been adjusted but it is my online reference:

http://www.inkjetcarts.us/support/assets/PDI_Target-DCPHiRes.jpg

Musicvid wrote on 12/12/2017, 2:12 PM

Like the differences in REDS tween the red robot and the frame around it

Haha, @wwjd wins the award for best color pick of the day!

What you are seeing is the embedded Adobe RGB ICC Profile, for which this print was produced as a reference. As the first major photo printer profile, the reds represent a tradeoff between film and RGB and ink.

I picked it because I always liked that skin look, even though some photographers criticize it as being overcompensated.

Musicvid wrote on 12/12/2017, 2:29 PM

And if you really want to get crazy with this stuff...

http://www.gballard.net/photoshop/pdi_download/

karma17 wrote on 12/21/2017, 12:35 PM

This is a good project. DSC labs could use the competition. I was just curious what the difference is between the two Caucasian babies on the bottom? Is it WB difference?

Musicvid wrote on 12/21/2017, 6:07 PM

The redhead has entirely different skin tones than the blond baby.