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How to preview a blue accent in a photo on Mac

Use Rainbow Art to preview a blue detail against a monochrome portrait before deciding whether to apply the effect.

3 stepsUpdated 12 Nov 2026Get Rainbow Art - Color Brush
What you'll achieve
You will see the original beside a black-and-white preview in which the blue scarf stays colored.
What you need
  • Rainbow Art 2.0 for Mac.
  • A photo with a distinct blue area, such as the scarf in this example.
Rainbow Art shows the original cobalt scarf portrait beside a monochrome Blue Accent preview, with the scarf preserved in vivid blue.

Rainbow Art's Color Splash presets let you compare an original image with a selectively colored preview. This guide follows the Blue Accent preset in the macOS 2.0 app, using a portrait whose scarf is cobalt blue.

  1. 1.Open a photo with a blue detail

    Open a photo in Rainbow Art. This example uses a portrait with a cobalt-blue scarf, so you can clearly see which color stays visible.

    Rainbow Art with a portrait of a man wearing a vivid blue scarf, ready for a selective-color edit
    Rainbow Art with a portrait of a man wearing a vivid blue scarf, ready for a selective-color edit
  2. 2.Choose Color Splash

    Choose Color Splash in the sidebar. Its preset gallery includes Blue Accent, which selectively keeps blue color.

    Color Splash selected in Rainbow Art, with accent presets visible in the inspector
    Color Splash selected in Rainbow Art, with accent presets visible in the inspector
  3. 3.Preview Blue Accent before applying

    Select Blue Accent. Compare the original portrait on the left with the monochrome preview on the right, where the scarf remains blue. Select Apply to accept this look or Cancel to leave it unchanged.

    Blue Accent preview compares the original portrait to a monochrome version retaining the bright blue scarf
    Blue Accent preview compares the original portrait to a monochrome version retaining the bright blue scarf

After the last step

The edit stays a preview until you choose Apply.

Tips

  • Choose a photo whose blue subject contrasts clearly with the surrounding scene.

  • Use Apply only after the preview matches the look you want.

  • Watch outThe final step previews an effect; it does not save a file. Apply the effect before preparing an export.