hiya,
if i understood the original question right, then a somebody
gave you a RGB 8bit value (say 160/100/50) and a CMYK 8bit value
(say 75/35/185/55) and asked you to match the exact color in nuke?
if that's the case, ask them back what color space they mean!
because unless you know that, the values are completely (well,
nearly) useless, and you'll be playing a guessing game.
better even, ask them to create a sample file in photoshop, have
them look at it on a calibrated monitor, save it with the color
profile attached and send it to you.
i know that the reality is that often that they will just blink
and wonder what you're talking about, but try to explain to them
that a number alone doesn't give you any accurate reference
(it's like giving describing the size of a piece of paper by
saying it's 4x7 without giving a scale like cm, inches etc)
or put in another way, (160/100/50) in sRGB looks different then
(160/100/50) in Adobe1998 then in ProPhoto etc (and while in RGB
you have a good chance that they meant sRGB, it's nearly
impossible to make a good guess in CMYK).
and even if you know the color space, it might be tricky to get
them into nukes float system.. ie if you have (160/100/50) in
ProPhoto, how do you bring this into nukes linear RGB space?
it's much more complicated then to simply change the gamma from
1.8 to 1.
i'm sure places with a dedicated color pipeline wizard will
smile at this problem, but personally i've found that if i have
to do color management on complicated color spaces my best bet
is usually to use after effects for the conversions as otherwise
i'll get lost in nitty gritty color management problems to get
things work in nuke (like creating LUTs etc, usually messing up
somewhere ;)
or, if you don't have super saturated colors or dark
greens/blues/browns, it might be easiest to just have photoshop
convert the images to sRGB and go from there (since there is a
color transform in nuke for that space).
just some thoughts
++ chris
On 12/10/12 at 8:11 AM, (Brads) wrote:
Hi Guys,
A client has given me a cmyk as well as a 1-255 rgb value.
What is the best way to translate this into the correct color
using the nuke color picker?
I see nuke onlu uses 0-1 values. I'm assuming this is because
it's floating point and 1-255 is 8-bit right?
I's sure I could use photoshop or just google it but out of
interests sake how do I do this?
He has also given me a hex value so, in addition, how do I pick
a hex color value in nuke?
I see I can use a color wheel to get a hex color value but how
do I convert back and forth?
Thanks
Brad
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