Adjust Brightness and Contrast
This section describes how to adjust with [Brightness/Contrast] tab.
The brightness adjustment function is to adjust the tone curve by changing the middle point value of the brightness of the entire image. The brightness adjustment is the adjustment of the output value at base point where the input value (horizontal axis) in curve view area is 50%. When the slider is moved to the right (when the input value to the input box is large) the images is made brighter, and when the slider is moved to the left (when the input value to the input box is small) the image is made darker.
The contrast adjustment function is to adjust the gradation for the bright part and the dark part of the entire image. The contrast adjustment is the adjustment of the output value at base point where the input values (horizontal axis) in curve view area are 25% and 75%. When the slider is moved to the right (when the input value to the input box is large) the contrast is made stronger, and when the slider is moved to the left (when the input value to the input box is small) the contrast is made weaker.
For details, refer to Image Quality: Adjusting the Tone Curve.
The adjustment using [Brightness/Contrast] tab adjusts each color of CMYK collectively. For details about each color adjustment, refer to Adjustment of Tone Curves (Each Color).
Click [Brightness/Contrast] tab on the [Tone Curve Adjustment] screen.
[Brightness/Contrast] tab appears.
Drag the [Brightness] slider to left/right. You can also set a value between -25 and 25 (inclusive) in the [Brightness] box.
The value of the adjustment is reflected to curve view area and to preview of [After Adjustment].
Drag and move the [Contrast] slider to left/right. You can also set a value between -25 and 25 (inclusive) in the [Contrast] box.
The value of the adjustment is reflected to curve view area and to preview of [After Adjustment].
Confirm the preview of [After Adjustment], and repeat Step 2 and Step 3 as required.
When you adjust each color, go to Adjustment of Tone Curves (Each Color).
When you execute confirmation print to confirm the result of tone curve adjustment, go to Confirm the Result of Tone Curve Adjustment.