How to make black and white photos, except for one color in Photoshop is not difficult. Below are details on how to retain a color when converting an image to black and white using Photoshop .
Step 1: Choose a color and turn everything black & white
You can apply this method to any photo you want to convert to black and white, except for one color. Basically, you need a Hue/Saturation layer and adjust the properties in the Properties panel .
1. Create a Hue/Saturation adjustment layer .
2. In the Properties panel , click Color Picker .
3. Click on the color you want to choose. This example chooses red glasses.
4. Drag the Saturation slider to the left to remove all red in the image.
5. Drag the middle right slider to the right.
6. Move the slider on the right to a 15 degree angle as shown below.
7. Move the left slider to 315 degrees .
8. Move both smaller sliders in each group so they are right next to each other as shown below. This action will refine the selections so that red is the only color in the image.
As you can see, every color has been removed except red. However, you will realize that some red color still needs to be removed to make the image look better. Let's move on to the next step.
Step 2: Hide unwanted red pixels
Next, we will hide the red spots on the fingers, wine bottle, face and neck, leaving only the red lips.
1. Press B to open the Brush tool or select it from the toolbar.
2. Select the Soft Round brush .
3. Create a Hue/Saturation adjustment layer .
4. Go to Reds channel .
5. Move the Saturation slider to the left to remove all red points.
6. With the top Hue/Saturation layer's mask selected, press Ctrl + I to invert the mask.
7. Press D to get the default Foreground/Background color. Here, white will be the default choice.
8. Erase the red color everywhere, except the cup and lips. Now you've created a black and white photo that's down to just one perfect color.
Step 3: Change the color of the drink
This step simply requires adding a Hue/Saturation adjustment layer.
1. Create a third Hue/Saturation adjustment layer .
2. Select Reds channel .
3. Move the Hue slider to +125 .
4. Switch the Saturation slider to +18 .
5. Change Lightness to -45.
6. Press the X key to make the Foreground color black.
7. Press B to open the Brush tool again if it is not already activated.
8. Apply on lips to restore red color.
Super easy, right? Just 3 adjustment layers and slight changes to keep one color while converting the photo to black and white using Photoshop. Hope the article is useful to you.