What does histogram normalization do?

It stretches the intensity range of an image so that the darkest pixels become black and the brightest pixels become white, which significantly improves overall contrast.

How do the percentile sliders work?

The lower percentile ignores the darkest pixels, while the upper percentile ignores the brightest. This helps prevent extreme noise or outliers from skewing the contrast adjustment.

Can I change the file format?

Yes, you can convert your image to JPEG, PNG, or WebP, or choose to keep the original file format.

Is there a limit to the file size?

Yes, the tool supports image files up to 20 MB.

Does this tool reduce image quality?

The tool uses high-quality processing. You can adjust the quality setting (1-100) for lossy formats like JPEG and WebP to balance file size and visual fidelity.

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Image Normalize

Normalize image histogram to enhance contrast by stretching the intensity range

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6 options

FilesUpload source files for this workflow.1

Image FilefileRequired

Single file max size: 20 MBSupported types: image/jpeg, image/png, image/webp, image/gif, image/bmp, image/tiff

Upload any image file (JPEG, PNG, WebP, GIF, BMP, TIFF) to enhance contrast through histogram normalization

SettingsAdjust formats, ranges, numbers, and modes.4

Lower PercentilerangeOptional

0.110

Percentage of darkest pixels to ignore (0.1% - 10%). Lower values preserve more shadow detailUpper PercentilerangeOptional

9099.9

Percentage of brightest pixels to ignore (90% - 99.9%). Higher values preserve more highlight detailOutput FormatselectOptionalChoose output format or keep original. PNG recommended for maximum qualityQuality (1-100)numberOptionalOutput quality for lossy formats (JPEG, WebP). Higher = better quality but larger file size

TogglesEnable or disable optional behavior.1

Auto ContrastcheckboxOptionalEnabled when checkedAutomatically enhance contrast using 1% and 99% percentiles (recommended for most images)

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Image Normalize

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Key facts

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Use cases

Examples

1. Enhancing Faded Scanned Documents

2. Optimizing Hazy Landscape Photos

FAQ

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