Threshold
Turn color photo to black-white image or with few transition levels. This function is always used for special purposes, such as OCR or other further processing.
Enter the function:
Click 'Threshold ' from the popup menu of button 'Exposure'.
The interface and the description:
Methods
- Global, Fixed threshold. Any pixels brighter than threshold turn into white, otherwise black.
- Adaptive threshold. Compare pixels with their around area, if brighter than their corresponding threshold, make it white; Otherwise, black.
- Diffuse, Simulate grayscale by black pixel mixed with white.
- Halftone, Simulate grayscale by group black pixel over white background.
Threshold，See methods 1,2
Level, Give some transition between black and white. Set to 0 for standard threshold processing.
Size of adaptive region, The size of what we called 'around area' in method 2. |
