Thanks for the reports. To be able to verify and fix issues we need to know the exact steps you took to trigger a bug. Now, I'm not quite sure if I understood your situation correctly. However, here's how I see it:The sensitivity parameter is documented to have an effect only in the dynamic thresholding mode here: https://doc.visionappster.com/3.0-beta6/tools/detectblobstool/#detect-blobs. Some tools have input parameters that have an optional effect. They don't however disappear to avoid breaking connections. invert in Find Threshold is an output parameter (function return value). It is calculated from input data and cannot be manually changed. You mean the Mask Image tool? RGB triplets can represent gray levels, and the tool does the RGB->gray conversion automatically. Did you try it? Is the output incorrect? This looks like a genuine bug. We were however unable to reproduce it. Can you send us the exact steps?