What is the blue hour?

The blue hour is the twilight period just after sunset or before sunrise, when the sky casts deep blue light.

What does the Blue Hour filter do?

It cools the white balance, lowers exposure, shifts colors toward blue, and adds a soft vignette.

What file formats can I export?

You can export as PNG, JPEG, WebP, TIFF, BMP, or HEIC.

Is this tool free to use?

Yes — completely free, no account needed. Your images are processed entirely in your browser and never uploaded to a server. Downloads have no watermarks.

← Online Time of Day Photo Filters

Blue Hour Photo Filter Online

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What you can expect

Turn any photo into a deep blue twilight scene. The Blue Hour filter cools the white balance, lowers exposure, pushes the image toward rich blues, and adds a soft vignette to recreate the moody light just after sunset. Adjust it with one intensity slider.

Related tools

More BrushCue tools that fit this workflow.

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Midnight Filter

Turn daytime photos into a moonlit midnight scene. The Midnight filter uses a day-for-night grade that darkens exposure, cools and desaturates colors, adds subtle film grain, and deepens the edges with a strong vignette. Control the effect with a single intensity slider.

Sunset Filter

Paint your photos with sunset colors. The Sunset filter warms the image, split-tones highlights toward orange and shadows toward magenta and purple, boosts saturation, and adds a vignette for a dramatic evening sky look. Control the effect with a single intensity slider.

Dawn Filter

Make your photos look like they were taken at first light. The Dawn filter adds a cool, rosy tint, softens contrast, mutes saturation, and blooms the highlights for a hazy early-morning glow. Control the effect with a single intensity slider.

Kelvin Tuner

Adjust the color temperature of your image by setting a specific white point in Kelvin. Perfect for correcting color casts from different lighting conditions or creating a warmer/cooler aesthetic. D50 is our default, you can adjust from there.

Darken

A darkness adjustment tool with a user-controlled slider, designed to deepen shadows and reduce overall luminance for a richer, more dramatic look. Ideal for toning down overexposed areas, enhancing contrast, setting mood, and subtly obscuring details to create depth and atmosphere.

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Online Time of Day Photo Filters

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Frequently asked questions

What is the blue hour?: The blue hour is the twilight period just after sunset or before sunrise, when the sky casts deep blue light.
What does the Blue Hour filter do?: It cools the white balance, lowers exposure, shifts colors toward blue, and adds a soft vignette.
What file formats can I export?: You can export as PNG, JPEG, WebP, TIFF, BMP, or HEIC.
Is this tool free to use?: Yes — completely free, no account needed. Your images are processed entirely in your browser and never uploaded to a server. Downloads have no watermarks.

For developers

Use Blue Hour Filter from Python

Open the Jupyter notebook example to see how to run this tool from the BrushCue Python API, inspect the processing steps, and adapt the workflow for scripts or batch image jobs.

View Python notebook

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