Grass Valley Xnews Vertigo Suite v.5.0 - Manual (Page 89)

5-12 Xnews User Manual
Embedded Pages: Creating, editing and previewing
Making color adjustments
The Image Editor allows you to adjust the color properties of an image asset. Color
adjustments are applied immediately to the entire image, not just a specific area of interest.
You can experiment with different color settings, however there is no way to undo your
changes except to click the R
ESET A LL button, which returns the color settings to the state
they were in when the image was last saved, or by clicking the C ANCEL button, which closes
the Image Editor and the image asset remains unchanged.
Figure 5-11 and the following table demonstrate that you adjust the image’s color properties
by moving the property’s slider to the right or left.
Figure 5-11. The Image Editor’s color adjustment sliders
Contrast The difference in the luminance of the brightest and the darkest areas of an image. A
high contrast will display an obvious difference (i.e. black versus white) in the
luminance between two areas, while a low contrast makes the difference less obvious
or more gradual (i.e. shades of grey).
•
Move the slider to the right to increase the image’s contrast ratio.
• Move the slider to the left to decrease the image’s contrast ratio.
Brightness Generally, the brightness setting determines how light or dark a the colors of the image
are based on how close the colors are to white. The more white a color has, the brighter
it is.
•
Move the slider to the right to increase the image’s brightness (until all white)
• Move the slider to the left to decrease the image’s brightness (until all black)
Saturation Saturation refers to the intensity of a specific hue. It is based on the color's purity; a
highly saturated hue has a vivid, intense color, while a less saturated hue appears
more muted and grey. With no saturation at all, the hue becomes a shade of grey.
•
Move the slider to the right to increase the image’s saturation.
• Move the slider to the left to decrease the image’s saturation.
Gamma Alters the contrast of the mid-tone colors with little effect on pure white or black, which
is the function of the Contrast property above. Increasing the gamma ratio increases
the image’s highlight to shadow contrast in terms of mid-tone colors’ density values.
Decreasing the gamma setting intensifies the shadows amongst the mid-tone colors.
•
Move the slider to the right to increase the image’s gamma setting.
• Move the slider to the left to decrease the image’s gamma setting.