CRI vs TLCI vs TM-30 vs SSI Explained with the Sekonic C-800
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The Sekonic C-800 is able to measure CRI, TLCI, TLMF, TM-30 and SSI. All these indexes have been designed to give you confidence in the color rendering of the lights that you are using. This video will discuss what each of these indexes mean, and how you can use the C-800 to evaluate and measure them.
Reference Links:
Tech3355 document released by the EBU
tech.ebu.ch/docs/tech/tech335...
Protocol Fall 2015 TM30 - By Mike Wood
www.mikewoodconsulting.com/ar...
Understanding & Applying ™-30-15 - By Michael Royer & Kenin Houser
www.energy.gov/sites/prod/fil...
More About SSI
www.oscars.org/sites/oscars/f...
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The Sekonic C-800 is able to measure CRI, TLCI, TLMF, TM-30 and SSI. All these indexes have been designed to give you confidence in the color rendering of the lights that you are using. This video will discuss what each of these indexes mean, and how you can use the C-800 to evaluate and measure them.
We will help you choose which one of these indexes, or a combination of indexes that you may want to provide increased confidence in the lighting you use for your next production, and how to evaluate the information the C-800 gives you.
Before getting into these indexes there are a few things we would like you to understand.
First, we want you to understand the observer. The observer is what each of these indexes uses in order to measure the quality of their score. For example CRI and TM-30 will use human vision as the observer. TLCI will use a 3 chip broadcast camera as the observer, and SSI removes the bias of the observer all together.
Second, we want to explain what problem each of these indexes was designed to solve for… and how you can interpret its information to help out with your next production. CRI, Color Rendering Index, is based upon the evaluation of 15 colors, using the human eye as the observer.
The first 8 colors are what the Ra or CRI score is based on, and R9 through 15 are additional colors that allow you to further evaluate the quality of a light source.
You may hear of CRI extended, which is a score given based upon the evaluation of all 15 colors, but it is not the standard that lighting manufacturers are using when scoring their lights.
CRI was designed to score a light based upon how the human eye would be able to accurately perceive colors under ideal daylight conditions.
It allows us to examine how light sources that attempt to reconstitute daylight such as Mercury Vapor, Fluorescent, Incandescent and LED will perform. But originally it was designed to judge fluorescent lamps.
OK, so how can you use the C-800 CRI readout to evaluate the lights you intend to use.
Please note that this next section is bias toward what a filmmaker may look for when evaluating a light.
CRI is measured from 0-100. A Ra value between 85 - 95 is seen as good, and above 95 as exceptional. For image makers this doesn't mean a light is going to be good or bad. It simply a score based upon 8 very muted colors. In today's manufacturing process of LED’s, a lighting manufacturer can tweak “game” their lights to score high, but it may still not give you skin tones similar to standard tungsten or standard daylight.
Most gaffers and DP’s that trust CRI look at R9 Strong Red, R13 Light Yellowish Pink, and R15 Asian Skin Tone, to see how well a light is going to render skin. If a light has a high CRI (Ra) value and R9, R13 and R15 values above 85 most predict that it will give you pleasing skin tones. If R10 yellow, R11 green, R12 blue and R14 Moderate Olive Green (leaf) score high as well. You most likely have a light that won’t suffer from severe color rendering problems.
Пікірлер: 59
Thanks - love my C-800 - been a great tool so far.
@SekonicGlobal
4 жыл бұрын
Thank you for the positive feedback Curtis.
@michaelw2797
4 жыл бұрын
This is like going to a restaurant and seeing a celebrity out in the public - Curtis is a LEGEND! If anyone in this forum wants to learn more about audio and video watch his videos. Sorry, I'll let you get back to your meal now.
@kevinreid5871
3 жыл бұрын
@Anders Julius yup, have been watching on KaldroStream for since december myself =)
Just picked on my C-800 today. These videos are super helpful and educational. She explains things so well.
@SekonicGlobal
4 жыл бұрын
Thank You. Please let us know if you have any questions.
@dedskin1
Жыл бұрын
Can you show me how that helped you do better in lighting , see some of your work ?
I am super pumped for mine arriving tomorrow, this is the easiest to understand explanation of all the indexes I've ever seen.
@SekonicGlobal
4 жыл бұрын
Ab here. Thank you! If you need a walk through of the meter just let me know. I put a lot of time and research into this script. Glad yo liked it.
@NewLayer
4 жыл бұрын
@@SekonicGlobal Will do! I couldn't have done it better myself, although, that's not surprising 😂 A better thing to say is that I don't think anyone could have done it better.
@SekonicGlobal
4 жыл бұрын
Thank you. Thats a huge compliment.
@NewLayer
4 жыл бұрын
@@SekonicGlobal I mean it! But I am very upset at UPS because my package is delayed until tomorrow :'(
Excellent video! Very educational!
@SekonicGlobal
4 жыл бұрын
Thank you! More to come.
Incredibly informative. Thank you
@SekonicGlobal
4 жыл бұрын
Thank you for the great feedback!
Thank you so much for this very consise and informative video. Thanks for the tech doc links.
@SekonicGlobal
4 жыл бұрын
You are very welcome. We are becoming more focused on education. Let us know if you have any suggestions.
Amazing tool! I’m in love with our new C800 and we are preparing a review and a tutorial of use in spanish =)
@SekonicGlobal
3 жыл бұрын
Thank you.
Great explanation - thanks! Still saving for the C-800 ;)
@SekonicGlobal
3 жыл бұрын
Thank you.
I wish I could have that tool later, such a great tool 😊
@SekonicGlobal
2 жыл бұрын
Thank you.
Thank you for the well informative video. Sekonic C-800: How to add new Memory Data to a pre-existing Memory Title other than the last one created? All newly saved memory data seem to end on the last created Memory Title. This is regardless of the selection on the Memory Title folder. Selecting and Recalling a Memory Title doesn't work for this feature. I tried the C-800 Utility on macOS, but it doesn't allow copying and pasting memory data in any tabs. The User Manual doesn’t address adding new Memory Data to a pre-existing Memory Title. Any help would be greatly appreciated. Sekonic C-800 F/W 20-11-11 (860B)
I love the C-800. I would like to know the difference between CC# and CCi and which of the two is correct to set to have the value to be included in the calibration of the camera white balance setup.
@SekonicGlobal
2 жыл бұрын
Hi Favimesizae Every camera manufacture seems to use a different system for there built in color correction values. We apologize but neighter will sync up perfectly. We give an explanation of both the Manual that can be downloaded from our website. The explanation is someone long, and has some associated graphs to help in understanding it. If you download the C-800 instruction manual we explained CCI and CC# on page 189.
If someone on this planet really understands this and can follow the instruction, he or she must be a genius.
@SekonicGlobal
3 жыл бұрын
Ha ha, OF it is difficult science to grasp, we have inlcuded links in the description to some helpful white papers and online articles that go even more in-depth.
Is there are any other indexes can be used as a basis for performance when use the strobe light except the CCT/LB/CC index?
@SekonicGlobal
2 жыл бұрын
Any of the indexes CRI, TLCI, TM-30 and SSi can be used to evaluate strobes as well.
Sekonic C-800 is an amazing tool BUT the UI is like from mid-2000s PDA (if you are old enough to know what I mean) 😅 It reminds me my Palm Zire 71
@SekonicGlobal
Жыл бұрын
Sounds like we need an update! 🧓 We'll pass this feedback along to our team!
@DrRussell
Жыл бұрын
Yes. Resistive touch screen and input modes are dated, but the main issue is memory storage and retrieval. Fantastic capability, limited by UI. Happy to support the company with our funds if a revised UI with modern stored file retrieval process was released.
@palmijonsson5801
11 ай бұрын
@@SekonicGlobalshould one at this point save up for this potential update? Looking to get a meter soon but would not want to miss a new one if its coming soon.
Can you elaborate more on the meaning of the two SSI numbers in SSI underneath the CCT number.
@SekonicGlobal
3 жыл бұрын
Those are the number reflected given the settings you have in SSI mode.
@mrdkagen
3 жыл бұрын
What does those numbers reflect?
@SekonicGlobal
3 жыл бұрын
The SSI score. There is a clear explanation in the video. Have you watched it?
@mrdkagen
3 жыл бұрын
@@SekonicGlobal I have watched it but still have questions. When comparing SSI of the measured light to a referenced light source (i.e. Tungsten 32k or D55) I see the SSI numbers for the referenced sources in the two boxes under the CCT measurement box. But what is the SSI # for the measured source?
@SekonicGlobal
3 жыл бұрын
Great question. We now understand better. The two reading you get when on the SSI screen directly under the CCT and Delta UV are the score or scores based on the two reference illuminates you choose below it. So the score in the yellow box matches the yellow illuminate and the score in the magenta both matches the score of the magenta illuminate.
Could you measure the cam left side of her face for me, thank you! I love it, it's at 15:15 :)
@SekonicGlobal
4 жыл бұрын
I Mediaamerica, we cannot go back and measure it, but the measurement can be read on the meter if you pause the video.
can someone help me? Why do I need the c-7000? vs the c-800? worth the premium of $2,200?
@SekonicGlobal
2 жыл бұрын
If your a filmmaker your going to want the C-800 the C-7000 is able to output a CVS file via its computer utility that show you spectral distribution information in single nanometer bandwidths which is useful to people engineering lights, or some lighting designers who are trying to makeup for very narrow bandwidths of special deficiencies on certain lights with other, and that gets very complicated. The C-800 is for film makeing.
What is the name of the presenter? She's excellent.
@SekonicGlobal
3 жыл бұрын
Marisa, she's great.
Watching on my calibrated monitor and her skin looks way too red for natural skin tones. Did they white balance before making a video on colour? lol
@SekonicGlobal
2 жыл бұрын
Thanks for your comment. Yes, of course we take color seriously. Perhaps it's time to profile and calibrate your display again? Also, not everyone sees color the same way. Having caffeine or alcohol can affect color vision, too as well as other factors like age, diet and more.
why am i watching this? im broke.
@SekonicGlobal
3 жыл бұрын
It's still good information to know.
The "music" is very distracting
@SekonicGlobal
4 жыл бұрын
Thank you for you input. We will consider it when making future content.
@kylelimeback
4 жыл бұрын
I didn't find it distracting.
@dreamplace7469
4 жыл бұрын
@@SekonicGlobal Seems Ian put the word, music, in quotations because he's making a judgement that it isn't music by his definition. No wonder it distracted him. Not a comment to take too seriously.
Sekonic devices are great but wildly overpriced. There are so many different methods for people these days, that the over priced to the film pros pricing approach just might bury companies as we go forward. If a Sekonic device was less expensive, every filmmaker or hobbyist would have a device in their camera bag. So the question is - Do you want to sell a couple of thousand devices and a good profit margin or millions at a lower profit margin. I think you might crunch numbers and calculate the worth of your products to driving the price from a perspective of gaining back R&D and advertising etc, But in my opinion, as tech gets better and better - you will lose position in the marketplace.
@SekonicGlobal
3 жыл бұрын
Thank you for the feedback Jim. We always want to do the most we can to give value to our customers. We do a lot in order to have aggressive pricing. With the introduction of the L-858D we included full cine functionality and its prices at $599 and the previous L-758 Cine was Over $750. Also we prices our C-800 to be one of the lease expensive spectrometers on the market. Other "color meters" are less expensive but the C-800 is a spectrometer, much more advanced tech and less able to be fooled by LED lights. Our profit margins are set based on the cost of us doing business and we do not look to make an excessive amount of profit from out customers. We believe our pricing is fair. Albeit high for some we do have a premium product that is built to last decades.