To make one color pop in a black and white photo using Photoshop, you can use a filter to isolate the color you want to keep and convert the rest of the image to grayscale.
Here's a general method based on the reference and common Photoshop techniques:
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Open your image in Photoshop.
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Identify the Color: Determine which color you want to emphasize and keep in its original form while turning the rest of the image black and white.
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Use a Color Range Selection (Likely via a Filter): The video reference mentions using a filter and a range setting. This likely refers to Photoshop's color range selection capability. You'll want to select the specific color you want to keep.
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Invert the Selection: Once you've selected the color you want to keep, you'll need to invert that selection so that everything else is selected. This allows you to apply a black and white adjustment only to the background.
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Apply a Black and White Adjustment Layer: With the inverted selection active, add a Black & White adjustment layer. This will convert everything except the selected color to grayscale.
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Fine-tune the Color Range (Optional): You might need to refine the color range to perfectly isolate the desired color and avoid unwanted desaturation. This can be done by adjusting the "Fuzziness" or "Range" settings in the Color Range selection dialog, or by masking the adjustment layer.