# Image White Balance

Fix color casts and set the mood of a photo with white balance. Auto mode uses the gray world method, which assumes the scene averages to neutral gray and scales red, green and blue until their averages match. Temperature then warms or cools the image and tint shifts it between green and magenta, either on top of the auto correction or alone in manual mode. Great for indoor and mixed light photos.

## Frequently asked questions

### How does auto white balance work?

Auto mode measures the average red, green and blue of all visible pixels and calculates a gain for each channel that brings its average to the overall gray average. This gray world method removes most uniform color casts from artificial light, shade or old prints. Each gain is limited to between 0.5 and 2.

### When does the gray world method fail?

It assumes the scene contains a balanced mix of colors. Photos dominated by one color, such as a green forest, a sunset or a red wall, get overcorrected toward the opposite color. Use manual mode for such scenes and set temperature and tint by eye.

### What does the temperature slider do?

Temperature ranges from -100, cool, to 100, warm. At 100 red is multiplied by 1.25 and blue by 0.75, and at -100 the reverse, with values in between scaled proportionally. It is applied after the auto correction in auto mode.

### What does the tint slider do?

Tint ranges from -100, green, to 100, magenta, and corrects casts that temperature cannot, such as the green of fluorescent tubes. Positive values reduce green by up to 20 percent and negative values increase it by up to 20 percent.

### What is the difference between auto and manual mode?

Auto mode first applies the gray world correction and then your temperature and tint. Manual mode skips the automatic step and applies only temperature and tint, which is useful when the scene is not balanced or you want to keep the original light.

### Are transparent pixels included in the auto analysis?

No, fully transparent pixels are ignored when the averages are measured, so a cutout on a transparent background is balanced on the visible subject only. The alpha channel itself is kept unchanged.

### Will highlights clip?

Channels that are boosted can reach the maximum value, so very bright areas may clip slightly in one channel. Moderate temperature and tint values avoid this in most photos.

### Does it work on grayscale images?

Grayscale images are converted to RGB first. Auto mode leaves them neutral, while temperature and tint can add a warm or cool tone to them.

### 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.

### What engine applies the correction?

The channel averages are measured in the tool and the gains are applied with the linear operation of the sharp library, which multiplies each channel in a single pass. The result is deterministic.

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