This is a color picture into a grayscale image examples, use the slider to control the threshold.

imageCovertandThreshold\Debug\imageCovertandThreshold.exe
.......................\.....\imageCovertandThreshold.ilk
.......................\.....\imageCovertandThreshold.pdb
.......................\imageCovertandThreshold\5.jpg
.......................\.......................\Debug\CL.read.1.tlog
.......................\.......................\.....\CL.write.1.tlog
.......................\.......................\.....\imageCovertandThreshold.exe.embed.manifest
.......................\.......................\.....\imageCovertandThreshold.exe.embed.manifest.res
.......................\.......................\.....\imageCovertandThreshold.exe.intermediate.manifest
.......................\.......................\.....\imageCovertandThreshold.lastbuildstate
.......................\.......................\.....\imageCovertandThreshold.log
.......................\.......................\.....\imageCovertandThreshold.obj
.......................\.......................\.....\imageCovertandThreshold.pch
.......................\.......................\.....\imageCovertandThreshold_manifest.rc
.......................\.......................\.....\link-cvtres.read.1.tlog
.......................\.......................\.....\link-cvtres.write.1.tlog
.......................\.......................\.....\link.24784-cvtres.read.1.tlog
.......................\.......................\.....\link.24784-cvtres.write.1.tlog
.......................\.......................\.....\link.24784.read.1.tlog
.......................\.......................\.....\link.24784.write.1.tlog
.......................\.......................\.....\link.read.1.tlog
.......................\.......................\.....\link.write.1.tlog
.......................\.......................\.....\mt.read.1.tlog
.......................\.......................\.....\mt.write.1.tlog
.......................\.......................\.....\rc.read.1.tlog
.......................\.......................\.....\rc.write.1.tlog
.......................\.......................\.....\stdafx.obj
.......................\.......................\.....\vc100.idb
.......................\.......................\.....\vc100.pdb
.......................\.......................\imageCovertandThreshold.cpp
.......................\.......................\imageCovertandThreshold.vcxproj
.......................\.......................\imageCovertandThreshold.vcxproj.filters
.......................\.......................\imageCovertandThreshold.vcxproj.user
.......................\.......................\OpenCV_debug.props
.......................\.......................\OpenCV_release.props
.......................\.......................\ReadMe.txt
.......................\.......................\stdafx.cpp
.......................\.......................\stdafx.h
.......................\.......................\targetver.h
.......................\imageCovertandThreshold.sdf
.......................\imageCovertandThreshold.sln
.......................\imageCovertandThreshold.suo
.......................\.pch\imagecovertandthreshold-cf976d88\imagecovertandthreshold-48438fa2.ipch
.......................\.mageCovertandThreshold\Debug
.......................\.pch\imagecovertandthreshold-cf976d88
.......................\Debug
.......................\imageCovertandThreshold
.......................\ipch
imageCovertandThreshold

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