I am writing a program that passes TCP data to a server that

def TCPfin(self,imgprevstr):
        timenow = datetime.now() #get current time

        #quick
        splitimgprevstr = imgprevstr.split(',',11)
        splitimgdata = splitimgprevstr[11] #qstring with 540000 chars
        imgwidth = int(splitimgprevstr[9])
        imgheight = int(splitimgprevstr[10])

        rgbArray = np.zeros((imgwidth,imgheight,3), 'uint8')
        #slow from here

        for ih in range(0,imgheight,1): # takes around 220ms per loop (3 loops for the 3 RGB channels
            for iw in range(0,imgwidth,1):
                curpixelR = splitimgdata.mid(iw*6+ih*imgwidth*6, 2) #get a pair of chars from the qstring
                rgbArray[iw,ih,0] = (curpixelR.toInt(16))[0] #convert the ascii hex qstring into an int

        for ih in range(0,imgheight,1):
            for iw in range(2,imgwidth,1):
                curpixelG = splitimgdata.mid(iw*6+ih*imgwidth*6, 2)
                rgbArray[iw,ih,1] = (curpixelG.toInt(16))[0]

        for ih in range(0,imgheight,1):
            for iw in range(4,imgwidth,1):
                curpixelB = splitimgdata.mid(iw*6+ih*imgwidth*6, 2)
                rgbArray[iw,ih,2] = (curpixelB.toInt(16))[0]

    #Total execution time 656ms
    # quick
    fintime = self.millis(timenow)
    print fintime
        previmg = Image.fromarray(rgbArray)
        previmg = previmg.rotate(90)



        self.parent.slot_testcall(previmg) #image sent to GUI module to update screen