That’s not all all what I’m talking about…..nothing to do with the device I’m using for printing…it’s all about i1Profiler’s algorithm for creating patch sets. If you’re familiar with i1Profiler’s patch sets, you’ll notice that as you increase the patch count it will add more neutrals and near-neutral patches….until there’s a point where it removes them and replaces with more “color” steps…then you step through more patches until it starts adding more neutrals again….and then removes them again at certain thresholds. This “phenomenon” happens repeatedly all the way to the maximum of 6000 patches. I could find all the patch count combinations manually that give the maximum number of neutral patches but I’ve got better things to do than step through 6000 patch combinations to find each patch count threshold! Terry
On Apr 4, 2018, at 1:09 PM, forums@walkerblackwell.com wrote:
I think this (how many patches to print) generally depends on a few things.
1. How many gray inks do you have. 2. How are these inks overlapped in the RIP (or driver). 3. How linear are the ink ramps to begin with: aka, how much work does the profile have to do. 4. How “neutral” are your inks and how does the rip compensate for this. The “color modules” in the epson driver compensate for the warm neutral semi-carbon of the PK/MK, LK, and LLK inks. 5. All of the above will determine how NOISY your printer is in the neutrals: aka, how much hue variance it has from one near neutral to the next near neutral printed on a different part of the paper. This is also effected by dither and resolution, etc.
It’s complicated.
In short, I’ve found anything over 600 near neutral patches (RGB profiling with a neutralized K in the driver) is overkill and just gets your neutrals to be worse. You would probably need to more and wider neutrals (for CMYK) if the K is not a neutral ink or if your rip does not compensate for this internally.
Long story short: too many variables at play, each system is unique.
Best, -Walker
On Apr 4, 2018, at 12:50 PM, Terence Wyse <wyseconsul@mac.com> wrote:
Hello all,
Does anyone here know the “tipping point” for “color” vs gray patches in X-Rite i1Profiler? I’d like to find out what are all the different CMYK patch counts that optimize the number of neutral/near-neutral patches.
There’s a list of these for RGB patch sets but nothing for CMYK patch sets that I’m aware of.
Regards, Terry Wyse _______________________________________________ Do not post admin requests to the list. They will be ignored. colorsync-users mailing list (colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/forums%40walkerblack...
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