Photoshop tutorial on using curves to correct white balance of gray photos

In the digital later period, there are many ways to correct the color white balance of the image, we want to use the curve to adjust the layer of the way to correct the color of the picture.

The advantage of this adjustment is that if you are not satisfied with the color, you can return at any time to continue to adjust the overall feeling of color. Let's begin today's simple tutorial with me

First look at the effect of the picture:

Original:

Open the original picture, as shown below, click on the Black and white button below the layer to add a threshold value for the picture (Threshold)

After clicking Add, you can see the adjustment panel of the Threshold value (Threshold), as shown below

We will adjust the threshold value (Threshold) to find the most accurate white and black in the image. First adjust the threshold to the left as shown below, and use the Color Sampler tool to mark the solid black position.