CLAHE Enhance
Boost local contrast with CLAHE (Contrast Limited Adaptive Histogram Equalization). Recover detail in dark or hazy photos.
CLAHE divides the image into tiles and equalizes each tile separately, then bilinearly interpolates between tiles to avoid blocking artifacts. The clip limit caps amplification so noise isn't blown up. Used in medical imaging, dark photography rescue, and dehazing.
How to Use CLAHE Enhance
- Upload an image: Upload one of the formats listed by the tool (JPG, PNG, WebP) and wait for the local preview.
- Adjust settings and process: Adjust the available controls, then run the selected image processing workflow in your browser.
- Review and download: Review the result, then download it in one of the formats offered by this tool.
Frequently asked questions
What is CLAHE?
CLAHE (Contrast Limited Adaptive Histogram Equalization) improves local contrast by equalizing tiles independently and clipping the histogram to limit noise amplification. It outperforms global histogram equalization on photos with mixed lighting.
How is CLAHE different from histogram equalization?
Global histogram equalization redistributes tones across the whole image, often crushing dark or bright regions. CLAHE works tile-by-tile with bilinear interpolation, recovering detail in shadows and highlights without making well-lit areas washed out.
When should I increase the clip limit?
Increase clip limit (10–40) for very dark, hazy, or low-contrast images where you want dramatic enhancement. Keep clip limit low (1–3) for photos that already look balanced. You'll just sharpen subtle local contrast without amplifying grain.
Is the CLAHE Enhance tool free?
Yes. All tools on Pixlane are free with no signup required.
Does it reuse cached assets on repeat visits?
Browser caching can speed repeat visits; uncached site assets can still require an internet connection.
What image formats are supported?
JPG, PNG, and WebP are supported.
Is CLAHE useful for medical imaging?
Yes. CLAHE is a standard preprocessing step in X-ray, MRI, CT, and microscopy pipelines. The local adaptation reveals tissue boundaries and lesions that global equalization would obscure.
Can CLAHE remove haze from outdoor photos?
Partially. CLAHE recovers contrast in hazy regions and is often combined with dedicated dehazing algorithms. For severe haze, pair CLAHE with the Retinex Illumination Correction tool.