In this study, we consider one step in the improvement of digital image - sharpening in the genre of portrait photography. Sharpness is applied using aperture 3x3, in certain areas. These areas we take from certain boundaries that have a threshold limit. Restriction is necessary because certain boundaries - an 8- bit grayscale, and an increase in the large image (image with the defined boundaries) we will see a lot of small particles, which in a later stage (sharpening), may be more visible. To exclude the increasing noise, a threshold limit (threshold).
sharpness, aperture, field area, the definition of the boundaries, the brightness, threshold