63
STANDARD SCAN UTILITY
HUE/SATURATION/LIGHTNESS CORRECTIONS
This palette adjusts the image in reference to the HSB colour model. These controls can be used to
manipulate the colour image rather than producing a realistic representation.
The HSB colour model defines colour based upon human perception rather than photographic
processes. Hue refers to each separate colour in the model. Saturation is how vivid each colours is.
Lightness describes how bright or dark a colour is in the colour space.
The hue control is not a colour balancing tool. It is a creative tool.
When changing hue in the palette, each colour is assigned a new
hue depending on the degree of rotation through the colour space.
For example, a very simple colour space could have three colours:
red, green, and blue. I have a red barn next to a green tree with a
blue sky. Now I rotate the image in the colour space; the colours
are reassigned a new hue based on the position – the barn is
green, the tree is blue, and the sky is red. The HSB colour space
is similar, but with many more hues.
Unlike the brightness control in the brightness, contrast, colour balance palette, the lightness control
does not change the apparent density of the colours equally. With an extreme increase in lightness,
blue will not appear as light as yellow.
1 Click the hue/saturation/lightness button to open the palette.
2 Drag the hue, saturation, or lightness slid-
er, or enter specific values in the corre-
sponding text box to make corrections.
• Dragging each slider to the right or inputting a positive
number in the text box increases the saturation, and
lightness. The hue slider rotates the colours in the image
through the colour space. The maximum position on the
left is the same as the maximum position on the right.
• Two colour-sample bars are displayed at the bottom of
the palette. The top sample indicates the colour space of
the original image. The bottom sample displays the rela-
tive changes to the colour space.
• Click the reset button to cancel any changes.
• Changes will be reflected in the prescan image.
AUTO SETTING
Click the auto-setting button adjusts the saturation automatically without
affecting the hue or lightness.
• Click the reset button to cancel any changes.
