Re: [libreoffice-marketing] branding colors - missmatch

Hi Thomas, *

Thomas Krumbein schrieb:
> Hey Bernhard,
>
> not shure, if you really understood the problem:
>
> It is not the color RGB (24,136,3) - this is the same value in Adobe CS
> by opening Logo-File (png, jpg or svg).

You twisted the numbers: Green is 163, not 136

Oh - that's different to what I read from your attachment:

"Color picked from Logo
HEX 25A22D
RGB 37 162 45
CMYK 79 0 100 0 "

These values are just wrong.

> But again, RGB is not for printing! Real world uses CMYK Colors.
> So, when I change to the RGB Color to CMYK, value is: 79,0,100,0 in
> Adobe CS.

IIRC you wrote in one of your mails that you agreed to Christoph that 
RGB (24,163,3) is equivalent to CMYK (85,0,98,36).

And in attachment you state that RGB (37,162,45) turns to the CMYK 
values you describe now as equivalent to RGB (24,163,3).

> Your branding-color table calls CMYK (85,0,98,36), which is real darker
> then the RGB color!

Did you try to print it?

I don't know the algorithms linking RGB (24,136,3) to CMYK (85,0,98,36) 
but this relation is used in Inkscape and on various sites in Internet.


http://web.forret.com/tools/color.asp?R=24&G=163&B=3
CMYK 0,853 / 0,000 / 0,982 / 0,361
for example.

> You understand the missmatch? I can use your CMYK (85,0,98,36) or I can
> use your RGB, which is CMYK (79,0,100,0). Both are different!

Our RGB is CMYK (85,0,98,36)!

A CMYK color consisting only of 79% Cyan added to 100% Yellow must be 
way too light! It is converted to RGB (54,255,0).

Even the conversion from RGB (24,163,3) to CMY (replacing the Black 
component by equivalent parts of the three other colors) turns out to 
have 91% Cyan, 36% Magenta and 99% Yellow. [same link as above]
> My personal opinion: I will use CMYK (79,0,100,0), which appears nearer
> to the green in Web :-)

No, please use CMYK (85,0,98,36)!

Even if this is darker on your screen (I experienced broad differences 
among screens - especially between TFT and CRT monitors), it is better 
to have the "really printed" material consistent among each other than 
with a monitor representation.

Perhaps it is an Adobe Illustrator Bug - or an automatic attempt to 
reduce the Black part in the CMYK. But if you mix Cyan and 100% Yellow 
without any part of Magenta or Black the resulting color must be too 
light IMHO.

Please try to print a sample of CMYK (85,0,98,36). Only if the latter 
will not print in an appropriate color, we need to modify the Branding 
colors at the wiki.

Another possible solution would be to ask your printer's shop to convert 
RGB (24,163,3) to CMYK and give you the values.

If this result is far away from our values (which I can't believe based 
on the web search I did), we'll have to change our color.

We still need a spot color representation (at least for our main Green), 
but i don't possess any Pantone Filter, so i can't look for the best 
matching Pantone color.

But this is a different question at the moment, so I'd like to postpone 
this topic a bit.

Best regards

Bernhard

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