Fig. 1From: Visual appearance of the uterine cervix differs on the basis of HPV type status in high-grade squamous intraepithelial lesion: the results of a reliable methodDigital image analysis of acetowhite epithelium. ROI (green outline) and control (blue outline) are selected and the values of red, green, and blue are measured by using ImageJ software. The mean greyscale value is calculated according to the formula (Grey = R*0.299 + G*0.587 + B*0.114). The number in the top left corner of each colour histogram corresponds to the mean colour value of red, green, blue and greyscaleBack to article page