VueScan offers me a high degree of control, but I’ve found requires a bit of practice and experimentation to obtain the best scans.
I typically scan Kodachrome 25 slides at 4000 dpi (dots per inch) and then output as a Tif file to obtain the greatest amount of data. For this slide I opted to make a multiple pass scan to retain a higher degree of shadow detail. (VueScan offers the multiple pass option under its ‘Input’ pull down menu).
To make the most of the scan for internet presentation, I imported the Tif file into Lightroom and lightened the shadows and balanced the highlights, before outputting as a scaled Jpg. (The original scan remains unchanged during this process).
Kodachrome slides recorded tremendous amounts of information and the original Coolscan Tif is far too large to present here.