There are few common image enhancement: 1. brightness -> r = s + b 2. negative -> s = 255 - r 3. contrast -> scretching (flexible) dan thresholding (binary image) 4. smoothing -> generate blur penapis non linear (min, max, median) 5. sharpening (high pass filter), suit for getting edge How do I know what should I enchance? Is it brightness, contrast, or what? And how do I know if image is better after enhancement or not (evaluating result) objectively instead of subjectively by our perspective? Mainly for medical imaging such as USG, CT-SCAN, etc... As far As I know, I can see the histogram, but I still don't know what histogram to evaluate the result.

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