# Image Cool Filter

Give a photo a crisp, cool blue mood. The cool filter is a color matrix that reduces red to about 84 percent and raises blue to about 114 percent with a touch of green, so whites turn icy, shadows go steel blue and warm light is neutralized. Use it for winter scenes, technology and corporate imagery, night moods or to calm overly orange indoor photos, with intensity from 0 to 100.

## Frequently asked questions

### What exactly does the cool filter change?

Each pixel is multiplied by a matrix that lowers the red output to about 84 percent, keeps green at full strength with a little blue mixed in, and raises blue to about 114 percent with some green. Whites therefore turn pale blue and warm colors lose their orange cast.

### How does it differ from the warm filter?

It is the opposite shift on the temperature scale. The warm filter adds red and removes blue, while the cool filter removes red and adds blue. Choose by the mood you want or to correct the color cast of the light.

### How does the intensity setting work?

Intensity blends the cool matrix with the identity matrix, from 0, which leaves the photo unchanged, to 100 for the full effect. A value around 40 gives a subtle, modern cool tone.

### Can it fix photos taken under warm indoor light?

Yes, tungsten and candle light make photos look orange, and the cool filter counteracts that. For a measured correction with separate temperature and tint, or an automatic balance, use the Image White Balance tool.

### Will blue areas clip?

Very bright blue areas such as clear skies can reach the maximum blue value and flatten slightly. Lower the intensity if skies lose detail.

### How is it different from the cinematic filter?

The cool filter shifts the whole image toward blue evenly. The cinematic filter pushes only the shadows toward teal while warming the highlights toward orange, and it adds contrast.

### Is transparency preserved?

Yes, the alpha channel is untouched and only the color channels are transformed. Grayscale uploads are converted to RGB so the blue tone can appear.

### Which formats can I upload?

JPEG, PNG, GIF, WebP, TIFF and AVIF images up to 5 MB are accepted. Animated files use their first frame and images over 4000 pixels on a side are scaled down to fit. The output is PNG.

### Which subjects look best with a cool tone?

Snow, sea and mountain landscapes, architecture, cityscapes at dusk, product shots of electronics and moody portraits work well. Food and skin usually look better warm, so use low intensity there.

### What engine applies the filter?

The cool matrix is applied with the recomb operation of the sharp library in one pass. The result is deterministic.

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