All settings for image correction are placed within the Correction tab.
Here you can set such parameters of photo as brightness, contrast, gamma, sharpness, and greyscale. All changes of the settings will be displayed in the preview window.
Brightness — this parameter indicates how much do image pixel colours differ from the black colour. E. g. the brightness of the photo taken in sunny weather will be significant and visa versa that of the photo taken in the evening or at night will be low. Brightness is set in the range from - 100 to 100.
Contrast is one of the main image parameters, it regulates pixel brightness. When increasing the contrast, the light areas (pixels) of the image become lighter, while the dark ones become darker. And visa versa, when reducing contrast, dark pixels become lighter, while the light ones become darker and partially move to midtones. Contrast is set in the range from - 100 to 100.
Gamma — this image parameter allows changing colour intensity of dark pixels to a greater extent than that of light ones. In other words, it is possible to increase contrast, distinctness of the dark areas of the image, while not making light details of the photo too contrast or bright.
Sharpness is also one of the main image characteristics; it indicates the quality of reproduction of large fragments on the photo. Increasing sharpness is one of the common ways of improving image quality. Actually, increasing of the sharpness decreases the width of the borders between image areas with different brightness. The narrower the border, the sharper looks the photography. This is reached by lightening lighter pixels on one side of the border and by darkening the darker ones on the other side.
Grayscale — this option allows making black-and-white photo from the colour one. In the Grayscale mode, all the colours are cancelled for the image and only information on pixel brightness is saved. Furthermore, all the colours on the photo are transferred to the grayscale.
The Reset button makes it possible to cancel changes of all the settings and return them to default state.