Sometimes an image can have lots of information in the highlights and shadows and still appear dull. Overcast days can drain an image of middle tones. You need more contrast to make an image interesting. ImageConverter Plus offers additional opportunities to enhance image contrast. In addition to affecting the luminosity, hues or saturation you can also accentuate dark image areas. These effects are called maximum/minimum. Maximum effect increases brightness and size of light pixels of the whole image, while minimum effect reduces brightness and increases the size of dark pixels. Examples on how to apply these effects are available at:
https://www.imageconverterplus.com/help-center/about-icp/supported-effects/max-min/