Adobe photoshop cs2 사용자 설명서
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ADOBE PHOTOSHOP CS2
User Guide
4
Adjust the amount of shadow and highlight values that are clipped, and adjust the target color for the midtones.
5
Click OK to close the open dialog boxes to apply Auto Levels.
See also
The Auto Contrast command
The Auto Contrast command adjusts image contrast automatically. Because Auto Contrast does not adjust channels
individually, it does not introduce or remove color casts. It clips the shadow and highlight values in an image and
then maps the remaining lightest and darkest pixels in the image to pure white (level 255) and pure black (level 0).
This makes the highlights appear lighter and shadows appear darker.
individually, it does not introduce or remove color casts. It clips the shadow and highlight values in an image and
then maps the remaining lightest and darkest pixels in the image to pure white (level 255) and pure black (level 0).
This makes the highlights appear lighter and shadows appear darker.
By default, when identifying the lightest and darkest pixels in an image, Auto Contrast clips the white and black pixels
by 0.5%—that is, it ignores the first 0.5% of either extreme. You can change this default using the Auto Color
Correction Options found in the Levels and the Curves dialog boxes.
by 0.5%—that is, it ignores the first 0.5% of either extreme. You can change this default using the Auto Color
Correction Options found in the Levels and the Curves dialog boxes.
Auto Contrast can improve the appearance of many photographic or continuous-tone images. It does not improve
flat-color images.
flat-color images.
See also
To use the Auto Contrast command
1
Do one of the following:
•
Choose Image > Adjustments > Auto Contrast. The application of Auto Contrast is automatic with this option.
You cannot adjust any of the options in the following steps.
You cannot adjust any of the options in the following steps.
•
(Photoshop) Choose Layer > New Adjustment Layer and choose either Levels or Curves. Click OK in the New
Layer dialog box.
Layer dialog box.
2
In the Levels or Curves dialog box, click the Option button.
3
Select the Enhance Monochromatic Contrast option under Algorithms in the Auto Color Correction Options
dialog box.
4
Adjust the amount of shadows and highlights that are clipped, and adjust the target color for the midtones.
5
Click OK in open dialog boxes to apply Auto Contrast.
See also
To change default Auto Contrast and Auto Level clipping values in ImageReady
❖
Click Options in the Levels dialog box. Enter the percentage of extreme highlight and shadow pixels to clip, and
click OK. A value between 0.5% and 1% is recommended.