Apply curves adjustments to a photo or video on Mac
You can use the Curves adjustment to change the brightness and contrast in a photo or video. You can adjust the overall look of the photo, change the look of specific colours (red, green, and blue), and adjust settings for the black point, mid-tones, and white point.
The Curves adjustment shows a histogram with a diagonal line going from the black point (bottom-left corner) up to the white point (upper-right corner). To adjust the brightness or contrast, you can add points along the line at specific places where you want to change the photo or video. Drag a point up to increase the brightness; drag it down to decrease brightness. Drag a point left to increase contrast; drag it to the right to decrease contrast.
Go to the Photos app
on your Mac.Double-click a photo or video, then click Edit in the toolbar.
Click Adjust in the toolbar, then click Curves.
Do any of the following:
Automatically correct the curves of a photo or video: Click the pop-up menu below Curves, choose RGB or the colour you want to correct, then click Auto.
Manually set the black point, mid-tones, or white point of the histogram: Click
for the point setting you want to change, then click a location in the image that best represents the black point, mid-tones or white point of the photo or video.
Black point: Adjusts the point at which black areas become completely black (no detail can be seen).
Mid-tones: Adjusts the lightness or darkness of mid-tone areas of the image.
White point: Adjusts the point at which white areas are completely white.
You can also drag the top or bottom handle of the diagonal line in the histogram to change the black point and white point range of adjustment. For example, to adjust the white point of the histogram, drag the top handle to a new location.
Manually adjust the colour curves of a photo or video: Click the Add Points button, then click locations in the photo or video you want to change. Each click adds a point to the histogram’s diagonal line. You can also click along the diagonal line in the histogram to add points. After adding points, drag the points to adjust the brightness and contrast.
Change the red, green or blue colours in a photo or video: Click the pop-up menu below Curves, then choose the colour you want to change. Click the Add Points button and click locations in the photo or video you want to change. Drag the points added to the diagonal line to adjust that colour in the image.
