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What I wrote was is in reference to the red and green channels in the RGB ink separation images as they are viewed in photoshop (make sure you first go to assign profile and click "don't color manage") and is platform agnostic. Don't mess with the RED channel. You can change the values of the green channel, but altering the red channel to anything other than the values below will give you problems. You need to be comfortable working with individual channels or you might clobber something.

For the six channel printers the Red values to fire each separate ink are:

K — R-127

C — R-191

M — R-223

LC — R-247

LM — R-251

Y — R-239

The Green channel can have a value from 0-255

The Blue Channel must remain 255

There is no reason to change these Green values unless you are making your own ink purge images where you need to fire one ink to clear the line or ramps of individual inks. Making gradients of separate inks is not really a needed since you want to be able measure individually defined patches anyway.

In any case, printing these will only work when using QTR calibration mode with no color management. You will get a mess otherwise.

Hope that clears it up a little more.

Richard Boutwell

QTR-Quadtone RIP

Re: [QuadtoneRIP] Re: Calibration

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