Page 307 - Fundamentals of Light Microscopy and Electronic Imaging

290 DIGITAL IMAGE PROCESSING

γ = 0.6

γ = 1

γ = 2

Figure 15-3
Gamma ( ) correction for differential enhancement of light and dark features. Values of 1
differentially enhance dark pixels in the image, causing them to look brighter, while reducing
the contrast between them and bright objects in the image; values 1 differentially
suppress the dark features, accentuate bright features in the image, and increase their
contrast. Contrast adjustments with allow you to use the entire range of pixels representing
the object; this is distinct from contrast adjustment by histogram stretching.