Digital BW, The Print

Thanks Shilesh, if I decide to try QTR I'll give that a go. What
advantages does it have over just using the Epson driver for this
particular purpose? What advantages would it have over IJC/OPM?

I fixed the problem in OPM by making a profile that used more active
inks, but with all of their ink curves zeroed at zero pixel value (my
coating image is all black). But OPM is still a lot slower than the
Epson driver, and speed appears to help in the avoidance of faint
wheel marks. 

As an aside, why does 251, 0, 255 result in QTR delivering 100% LM
rather than 100% M?

Thanks,
Helen

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Shilesh Jani"
<shileshjani@b...> wrote:
>
> Helen,
> 
> If you want to overspray a print you gave already made using a single 
> ink channel, the best bet is to use QTR.
> 
> Here is how you do it:
> 
> (1) You have to create an RGB untagged TIFF file of the size you want 
> overprinted.
> 
> (2) Fill the entire image with a solid color. The choice of color to 
> fill depends on which channel you have loaded your Tipkote. Below I 
> list the RGB color values for the LM channel for Topkote.
> 
> (3) Save the image as a TIFF, untagged.
> 
> (4) Open QTR
> 
> (5) Select "calibration" in the options drop-down menu
> 
> (6) It will open a default calibration image, so you go 
> to "image", "select image" to open your file.
> 
> (7) Print, and viola!
> 
> You have the option of selecting ink (Topkote coverage in 5% 
> increments.
> 
> Good luck and let us know how it works out.
> 
> Shilesh
> 
> Below are the RGB numbers for LM:
> 
> The numbers R=251 and B=255 remains the same for all %. The number G 
> is listed
> 
> 5% = 242
> 10% = 230
> 15% = 217
> 20% = 204
> 25% = 191
> 30% = 179
> 35% = 166
> 40% = 153
> 45% = 140
> 50% = 128
> 55% = 115
> 60% = 102
> 65% = 89
> 70% = 77
> 75% = 64
> 80% = 51
> 85% = 38
> 90% = 26
> 95% = 13
> 100% = 0