QTR-Quadtone RIP

What you need is the single Vis (density) reading rather than the RGB 
readings. On the X-rite 810 there is a button to toggle between the two 
modes. You can convert density readings to Lab L figures (although qtr 
understands density figures as well).

If there is no vis mode an average of the RGB readings _may_ suffice.

In the files section of this group there is a spreadsheet which contains 
formulas to convert between Lab L & density.

Howard

andywebsterus wrote:
> OK I know I'm answering my own posts!
> 
>> Toolcrib will auto-paste these values into Excel....  (looked like I was 
>> getting somewhere) like this:
>> 
>> MGI RD-200 000255 
> 
> The useful part of this string are the values:
>  
> 00095B          00077A              00301A
> 
> They are R-G-B as HEX values.
> 
> I can get all the measurements neatly and automatically into Excel, 
> (each click on the densi pastes another reading into the sheet) then 
> converted to decimal.  The lower the number the more reflective the 
> surface.
> 
> 
> How do I convert these  decimal RGB values into something that QTR 
> will enjoy?
> 
> RGB to L ?  How to do that?
> 
>  I Have an IT8 target (Wolf Faust) which I might be able to use to check 
> calibration...
> 
> Andy
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
> 

-- 
Howard Shaw
glassman@...
www.howardshaw.org