# Image Warm Filter

Add golden, sunny warmth to a photo. The warm filter is a color matrix that strengthens red by about 10 percent, lifts green slightly and cuts blue to about 82 percent, so whites turn creamy amber, skin looks healthier and skies feel like late afternoon. An intensity setting from 0 to 100 percent lets you add just a hint of warmth or the full golden hour effect.

## Frequently asked questions

### What exactly does the warm filter change?

It multiplies each pixel by a color matrix that boosts the red output to about 110 percent with a little green mixed in, keeps green near 102 percent and reduces blue to about 82 percent. The result shifts all tones toward amber. Whites become a soft cream and cool shadows become neutral.

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

The warm filter raises red and lowers blue, while the cool filter does the opposite, lowering red and raising blue. Applied to the same photo they push it in opposite directions on the color temperature scale.

### How does the intensity setting work?

Intensity blends the filter matrix with the identity matrix. At 100 percent the full matrix is applied, at 50 percent each coefficient moves halfway, and at 0 the image is unchanged. Whole numbers from 0 to 100 are accepted.

### Will bright areas clip?

Very bright reds can reach the maximum value and lose a little detail, because the red output is boosted. Lower the intensity for photos with bright warm highlights such as sunsets or flames.

### When should I use a warm filter?

Use it to correct photos that look too blue, such as shots in shade or on cloudy days, to make portraits more flattering, or to give food, interiors and landscapes an inviting golden feel. For measured correction, Image White Balance offers a temperature slider.

### How is this different from the vintage filter?

The warm filter only shifts color temperature and keeps contrast and saturation intact. The vintage filter mixes in a sepia matrix, lowers contrast, lifts the blacks and adds dark corners for an aged look.

### Is transparency kept?

Yes, only the color channels go through the matrix and the alpha channel stays as it was. Grayscale images are converted to RGB so the warm tint can appear.

### Which formats can I upload?

Upload JPEG, PNG, GIF, WebP, TIFF or AVIF images up to 5 MB. Animated files use their first frame and images larger than 4000 pixels on a side are scaled down to fit. The result is a PNG.

### Can I apply it to many photos for a consistent look?

Yes, the filter is deterministic, so the same intensity gives exactly the same shift on every photo. That makes it easy to warm a whole series consistently.

### What engine applies the filter?

The matrix is applied with the recomb operation of the sharp library on libvips in a single pass. The calculation is exact, so no extra compression or resampling is introduced.

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