色調補正

Photoshop (us) から Photoshopコミュニティフォーラム (Japan) に移動しました。

Hi there,

To put it in a simple way:-

USE LEVELS WHEN:

• You only want to adjust the black or white end points to adjust global contrast
• You want to lighten or darken the entire tonal range. This is normal to adjust exposure errors.
• You want to maintain the visual relationship of the values of the intermediate tones.

USE CURVES WHEN:

• You want to subtly adjust the visual relationship of the tone values. For example lighten the lights and darken the shadows. This usually requires an ‘S’ shaped curve adjustment.
• You want to adjust only the light tones or only the dark tones.
• You want to adjust the tones in only a small section of the overall tonal range.
• You want complete control of your tonal editing.

Both commands also allow you to change the appearance of the intermediate–or grey–tones in-between the black and white end points. However, the important difference between the two commands is that a Levels adjustment proportionally changes all of the tones in the tonal range; whereas the Curves allow you to choose which portion of the tone scale you wish to adjust. The Levels is a linear adjustment but the Curves are a geometric adjustment (in fact, this difference is in the names: levels and linear, curves and geometric). This is a massive difference, and using Curves rather than Levels will elevate your editing skill to a professional level.

Hope this helps.
Regards,
Sahil