Image Threshold Tool
Convert an image into pure black and white by adjusting the brightness threshold.
Convert an Image to Pure Black and White
The threshold tool calculates pixel brightness and converts every pixel to either black or white according to the selected threshold value.
Example
At a threshold of 128, pixels with calculated luminance of 128 or higher become white, while darker pixels become black.
Factors That Affect the Result
Lower thresholds create more white areas; higher thresholds create more black. Original exposure and contrast strongly influence where useful details appear in the two-tone result.
Frequently Asked Questions
Does thresholding preserve gray tones?
No. The output contains only black and white pixel values.
Does it resize the image?
No. Dimensions remain unchanged.
Is processing local?
Yes. It runs in your browser.
Related Tools
Using an Image Threshold
Thresholding converts tones into a limited black-and-white result based on a cutoff value. It is useful for silhouettes, scans and high-contrast graphics. Adjust the threshold while watching fine details because a value that is too high or low can remove important shapes, text or texture.
Choosing a Threshold Level
A threshold converts image tones into a simplified black-and-white result based on a cutoff value. Lower or higher thresholds can reveal or hide different details, so adjust the setting while watching important edges. This effect is useful for silhouettes, scanned documents, masks, and high-contrast graphics.
Technical Method and Practical Limits
Thresholding converts tonal information into two output classes based on a cutoff value. A low or high threshold can erase useful detail, and uneven lighting often requires preprocessing or local threshold methods for document and image-analysis work.