Curve adjustment is a very powerful tool for color correction or adding creative contrast in an image. This tutorial will help learn how to use Curves for color correction and adding creative contrast in an image using LightX. Curves adjustment helps adjust multiple points throughout an image's tonal range so as to get granular control over shadows, mid tones and highlight intensity region of an image.
Here is a simple tutorials on how to use Curves for color correction or adding creative contrast in an image and thus making them more interesting on views.
Step 1: Open your photograph from Album and navigate to Curves: Open Image -> Pro -> Curves. In the beginning, the tonality of an image is represented as a straight diagonal line overlaid on the image with input intensity level mapping with output intensity level of the image. Horizontal axis in the graph represents the original input levels of and vertical axis in the graph represents adjusted output levels of an image.
You can add upto five control points on the line by tapping on the line. In the beginning, there will be two preselected points representing black and white intensity level of image.
Step 2: As you add control points to the line and move these points, shape of the curve changes, reflecting your overall image adjustments. Moving a point in the top portion of the curve adjusts highlights. Moving a point in the centre portion of the curve adjusts the mid tones, and moving a point in the bottom portion of the curve adjusts the shadows.
Moving a point either down or to the right maps input value to a lower Output value, and the image darkens. Similarly, moving a point up or to the left maps input value to a higher Output value.
Further, highlights can be darkened by moving a point near the top portion of the curve downward. Similarly, shadows can be lightened up by moving the point at the bottom upward along vertical axis.
As you adjust the tonality of the image by adjusting color of the image, the original baseline image and adjusted image can be compared using compare button in the application.
The tonal effect in the image can be changed in all 4 color channels (Gray, Red, Green and Blue channel). In the below image, tonality of the image has been adjusted in red color channel by selecting red color channel in the application.
Curves is similar to Levels in that, Curves tool also takes input tones and selectively stretch or compress so as to get desired output tone. But, unlike levels which provides control over only shadows, mid tone and highlights intensity level of an image, Curves provide multiple anchor points to control tonality of an image.