cmyk color space in DR?

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dariusii

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cmyk color space in DR?

PostTue May 11, 2021 4:10 pm

Hi all.
Hadn't see any topic about cmyk color space in Davinci.
There are a lab one, but not cmyk.
I understand, that cmyk are used for print and not for any viewports, but with cmyk curves very comfortable to correct color. There is a black point compensation strategy. I can change contrast of saturation for every cmy channel. Values of cmy curves stand not at lignthness, but on vibrance/color boost (resolve). As in ab (lab) curves. But lab paradigm is more harder, than rgb/cmyk.

But if developers hadn't that one, that they were thinking about something.

An example, how can use cmyk curves:
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dariusii

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Re: cmyk color space in DR?

PostWed May 12, 2021 7:07 am

It's very strange, that the topic no one's interested.
Excuse me, that I'd begin it.
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Re: cmyk color space in DR?

PostWed May 12, 2021 8:35 am

You can use RGB + luminance in most of the color controls which is in essence the same as CMYK. Also any true CMYK color profile would have a gamut that was partly outside any RGB output space which would be problematic.
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Re: cmyk color space in DR?

PostWed May 12, 2021 9:51 am

CMYK is a PRINT color profile and not for digital video

https://en.wikipedia.org/wiki/CMYK_color_model

Flyeralarm_CMYKvsRGB_en.png
Flyeralarm_CMYKvsRGB_en.png (13.97 KiB) Viewed 285 times


Flyeralarm_CMYK_de.jpg
Flyeralarm_CMYK_de.jpg (15.34 KiB) Viewed 285 times
Flyeralarm_RGB_de.jpg
Flyeralarm_RGB_de.jpg (15.64 KiB) Viewed 285 times
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dariusii

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Re: cmyk color space in DR?

PostWed May 12, 2021 9:59 am

rgb+luminance is based on luminance curve. 0-255/black-white. a color value is based on luminance curve. cmyk based on saturation curve. 0-255/high vibrance-low vibrance. as in lab.

cmy isn't a just "inverted" rgb (red-cyan, green-magenta, blue-yellow).
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Re: cmyk color space in DR?

PostWed May 12, 2021 10:03 am

Mark Foster wrote:CMYK is a PRINT color profile and not for digital video


dariusii wrote:I understand, that cmyk are used for print and not for any viewports, but with cmyk curves very comfortable to correct color.


pseudo cmyk as in 3dlc.
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Re: cmyk color space in DR?

PostWed May 12, 2021 10:08 am

Just I can't use lab color space for curves, because curves in Davinci resolve have a s-shaped curve. I can't use broken line in resolve's curve. For lab curves it's better, than s-shaped as for rgb.

A right example of lab curves - Canopus Edius' lab curves. There's I can use broken lines for that curves. As and into 3dlc app.
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Re: cmyk color space in DR?

PostWed May 12, 2021 6:24 pm

2 Mark Foster

I won't gonna to render video in cmyk image stills))

..strange people.
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Re: cmyk color space in DR?

PostWed May 12, 2021 6:55 pm

Mark Foster wrote:CMYK is a PRINT color profile and not for digital video

Oh no! Will monitor start oozing ink? In all seriousness this is absolutely irrelevant what the primary use case is for some color system, can you tell me if component value 0.27 is from RGB or CMYK system?
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Re: cmyk color space in DR?

PostWed May 12, 2021 7:51 pm

Perhaps, people say about color gamut. In rgb one the gamut wider, than in cmyk, but what prevent to wide it. Artifically.
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Re: cmyk color space in DR?

PostThu May 13, 2021 5:53 am

cmy curves = sat vs sat curve (Davinci), but for separate c, m and y channel.
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Re: cmyk color space in DR?

PostSat May 29, 2021 11:29 am

So does somebody know, how to create node' structure, that be emulate cmyk curves? ;(
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