Adjusting Tone Curve

Tone curve is a graph showing the balance of brightness. Edit tone curve to adjust the image brightness by adjusting the balance of tone input and output. You can make fine adjustments to the brightness of a specific area.

In ScanGear's Advanced Mode, click the [Tone Curve] button.

Reading Tone Curves

With ScanGear, scanning images via a scanner is the input, and displaying to a monitor is the output. [Tone Curve] shows the balance of tone input and output for each [Channel].

Adjusting Tone Curves

Color tone of the image can be adjusted by changing the shape of [Tone Curve] for each [Channel].

You can drag specific points on the [Tone Curve] or select from the pull-down menu of [Select Tone Curve] to adjust the image.

No adjustment (No Correction)

Convex curve (Overexposure)

Concave curve (Underexposure)

S curve (High contrast)

Downward-sloping line (Reverse the negative/positive image)

No adjustment

Convex curve

The midtone data of the input side is stretched toward the highlight of the output side, resulting in a bright-toned image when viewed on a monitor.

Concave curve

The midtone data of the input side is stretched toward the shadow of the output side, resulting in a dark-toned image when viewed on a monitor.

S curve

The highlight and shadow of the input side are enhanced, resulting in a high-contrast image.

Downward-sloping line

The input and output sides are reversed, resulting in a negative-positive inverted image.