In Photoshop, go to Image > Mode > Grayscale.

There are a few ways to change the color of a section of an image in Photoshop. One way is to use the Eyedropper tool and select a color from within the image. Another way is to use the Hue/Saturation adjustment layer.

There are a few ways to make a black section in Photoshop. One way is to use the Black & White adjustment layer. Another way is to use the Color Range tool and set the black range to the bottom of the color wheel.

In Photoshop, select the layer that you want to make black and white, and go to Image > Adjustments > Black & White.

There are a few ways to create a duotone in Photoshop. One way is to use the Color Range command and select the two colors you want to be the duotone. You can also use the Selective Color tool and fill the selection with one color, then use the Eyedropper tool to sample the second color and fill the selection with that color.

There are a few ways to make one color pop in Photoshop. One way is to use a layer mask to hide specific colors from view. Another way is to use a gradient tool to create a gradient that changes the color of one or more layers.

There are a few ways to change the color of something in a picture. One way is to use the color picker in photo editing software. Another way is to use a color filter on your camera.

There are a few ways to change the color of part of a picture. One way is to use a photo editor to change the color of specific parts of the picture. Another way is to use a color filter app on your phone or computer.

There are several ways to change colors in an image on an iPhone. One way is to use the color filters that come with the camera app. Another way is to use a photo editing app like Photoshop or iPhoto and change the colors of individual pixels.

There are a few ways to fake duotone, but the most common is to use a photo as the base color and then overlay it with a second color. You can also use an app like ColorfulTone to create duotone photos.

This is likely due to the fact that Photoshop does not support duotone files.