I have no experience trying to produce a print with photo paper in RA4 process so I cant tell if this matters for this. What this experiment does not tell is if that start to end piece of the range is larger or smaller just that when the range is located the response curve is correct applied to that range. When the start and end points are correctly located for each color the response (curve) remains similar between the two developers.
#USE LASERSOFT IT8 TARGET WITH VUESCAN SOFTWARE#
My guess is that CD3 (RA4 developer) changes the dye components density, confusing the Software which part of the scan range for each color (RGB) to apply the curve to. The result becomes better with CCR turned on, which is probably closer to the Vuescan autolevel feature does to the processing. However the worst color accuracy is (A) based on using the Fuji NPZ profile in Silverfast (w/o CCR). It would lead one to believe that CD4 and CD3 produces the same result. With Vuescan the most color accurate one (F) was converted with a C41 NPZ ICC film profile that I created in Vuescan based on a IT8 target in a Fuji NPZ frame from a previous roll developed in C41. There is a contradiction the sample material if you are looking for what CD3 (RA developer) instead of CD4 (C41 developer) does to the negative. Maybe CD3 uses 15% smaller space for green and blue and Silverfast profiles are operating with some pre known knowledge in which range the color samples can be found? (note I did not touch the "auto tolerance" which does improve the result somewhat) According to the histogram there seems to be almost no samples in the top 15% of the range for the blue and green component. LaserSoft SilverFastSilverFast 8 twgpcom.
I have no experience trying to produce a print with photo paper in RA4 process so I cant tell if this matters for this.It seems strange that Silverfast gets this wrong. LaserSoft Imaging AG is a software developer designing software such as SilverFast for scanners and digital cameras.The companys headquarters are located in Kiel, Germany, 100 kilometres (62 mi) north of Hamburg, and another office in Sarasota, Florida, United States. It seems strange that Silverfast gets this wrong.