Graphics Programs Reference
In-Depth Information
The contrast of an image signifies the luminance and/or color variation; in other
words, the separation between the darkest and brightest areas of the image. Increas-
ing the contrast emphasizes the distance between the dark and bright pixels in the
image, thus making shadows darker and highlights brighter. This effect makes parts
of the image pop up, making it a vibrant image. Decreasing the contrast makes the
shadows lighter and highlights darker, making the image dull and less interesting.
The following screenshot shows the effect of increasing and decreasing the contrast
value on the
Bright/Contrast
node:
The Hue Saturation Value node
The
Hue Saturation Value
node provides a visual spectrum-based image control.
The input image can be modified using the hue shift, which ranges from red to violet.
Hue
Using the
Hue
slider, the image hue can be shifted in the visible spectrum range. At
the default value of
0.5
, the hue doesn't affect the image. Reducing the value from
0.5
to
0
adds more cyan to the image, and increasing the value from
0.5
to
1
adds
more reds and greens.
