Dear All,
In this thread, I would like to study and discuss about CMYK profile VS RGB profile.
I've attached here a link with my ICC profiles, which is based on Epson P6000 with OEM ink and a cheap no brand RC satin paper.
https://drive.google.com/drive/folders/1Gog9rZtcH9wmdU_85o1YfrETmibUnkkE?usp=sharingThe RGB ICC was made in i1Profiler with a 3075 patches target which is custom designed by myself.
I had been using this target to profile all of my paper which produce very good color and neutral black and white print.
For the CMYK Profile,
I was using Ergosoft Poster Print and linearized the 3 times from 18 steps -> 36 steps -> 54 steps.
Then use ColorThink Pro 3 to plug in the number to try to find the optimal individual ink limit for each channel.
With the printed ink limit test chart, I chose 220% as the total ink limit for this combination.
After that, I used i1P to generate a target which has 2568 patches target.
Measured with i1P2 and i1IO2
The setting of the black separation ramian as default, but I chose "heavy" for the black curve.
Perceptual table I chose Colorful.
Table section is Optimized Quality.
In the Advanced setting, I picked Version 2 as the ICC Version.
And for the smoothness I slided all up to 100.
And the rest remain as default.
The outcome is quite interesting.
When I compare both ICC,
The RGB has much larger color gamut than the CMYK.
Specially in the Green and Blue area.
I've used Bill's 28 balls to do a softproof.
Which the cmyk one is actually "not that bad".
You can see a bit dull in the outer side of the color balls.
But the smoothness and the trasistion are very close to the RGB Profile already.
So now I have 2 questions here:
1.
When I compare a RGB profile to CMYK profile, am I doing a wrong thing already since this is more like comparing an apple to and orange?
2.
I've tried a lot of different combination of individual ink limit already, but I still couldn't even get close in the Green and Blue area comparing to the RGB profile.
Is that me or this is supposed to be like this?
I hope we can have a happy discussion here since I believe most of us use RGB printing workflow to print our works or client's job.
Best Regard,
Aaron Chan