def findFirstIdxEqualTo(self,value=255):
        vals = np.where(np.array(self)==value)[0]
        retVal = None
        if( len(vals) > 0 ):
            retVal = vals[0]
        return retVal
**SUMMARY**
dataset/ETHPy150Open sightmachine/SimpleCV/SimpleCV/LineScan.py/LineScan.findFirstIdxEqualTo