QTR-Quadtone RIP

Thanks David, that's been very helpful, I've now made a chart and can see what you mean.  I'll try and post the chart.

I think I made the mistake of chasing the numbers way beyond any useful limit and picked the high point of the curve, a fair way along the section with little increasing value.  Looking at the chart I can see the useful point should be around the 30%-40% mark.  I'll set to this and see where it gets me.

Ross

--- In QuadtoneRIP@yahoogroups.com, "David"  wrote:
>
> Ross,
>     As an example, I have just uploaded an image of a graph of densities I measured with UT-14 cyan on Ilford GFS:
> 
> http://groups.yahoo.com/group/QuadtoneRIP/photos/album/499015501/pic/list
> 
> These were printed with a 50% ink limit, but the numbers on the horizontal axis are corrected to a maximum of 100%.  As shown in the graph, there is a nice smooth increase up to about 32% ink density, and then a more erratic increase.  In my experience, it is counter productive to try to use anything beyond the smooth part of the curve.
> 
> David