Image Threshold

Image Threshold | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Design
Input types: file, number, checkbox
Output type: file
Sample coverage: 4
API ready: Yes

Overview

The Image Threshold tool allows you to convert any image into a high-contrast black and white binary format by setting a specific pixel intensity threshold. By defining a value between 0 and 255, you can isolate shapes, simplify complex visuals, or prepare images for OCR and stencil creation.

When to use

Preparing images for optical character recognition (OCR) by removing background noise.
Creating high-contrast stencils or silhouettes from photographs.
Simplifying complex diagrams or sketches into binary data for technical analysis.

How it works

1Upload your image file in formats like PNG, JPEG, or WebP.
2Choose whether to convert the image to greyscale first for more accurate intensity calculation.
3Set a threshold value between 0 and 255 to determine the cutoff point for black and white pixels.
4Process the image to generate your new binary output file.

Use cases

Isolating text from scanned documents to improve readability.
Generating binary masks for computer vision training datasets.
Converting detailed line art into clean, black-and-white vector-ready graphics.

Examples

1. Document Text Extraction

Researcher

Background

A researcher has several scanned pages of historical documents with grey, uneven backgrounds that interfere with text recognition software.

Problem

The background noise makes the text difficult for OCR tools to parse accurately.

How to use

Upload the document scan, enable 'Convert to Greyscale', and set the threshold to 150 to drop the background noise.

threshold: 150, greyscale: true

Outcome

The document is converted to a clean black-and-white image, making the text stand out clearly for OCR processing.

2. Creating a Stencil

Graphic Designer

Background

A designer needs to create a simple stencil from a portrait photo for a screen printing project.

Problem

The original photo has too much detail and color variation to be used as a stencil directly.

How to use

Upload the portrait, enable greyscale, and adjust the threshold until the facial features are clearly defined in black and white.

FAQ

What does the threshold value represent?

It is the intensity cutoff point. Pixels with a value equal to or greater than your threshold become white (255), while those below become black (0).

Should I use the 'Convert to Greyscale' option?

Yes, enabling this is recommended for color images to ensure the threshold is applied consistently across all color channels.

What file formats are supported?

You can upload JPEG, PNG, WebP, GIF, BMP, and TIFF files.

Is there a file size limit?

Yes, the maximum file size for uploads is 10 MB.

Can I process multiple images at once?

No, this tool is designed to process one image file at a time.

threshold: 120, greyscale: true

Run this tool

Inputs

Result

Examples that match this tool

Continue with connected tools and hubs

Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Document Text Extraction

2. Creating a Stencil

FAQ

Web Image Processing Python Samples

Web Image Processing TypeScript Samples

Android Image Processing Java Samples

Android Image Processing Kotlin Samples

Add Border to Image

Add Frame to Image

Add Glow Effect

Image Gradient Overlay

Binary Image Thresholding, Morphology, and Mask Tools

Image Format Conversion and Animated Export Tools

Image Cleanup, Framing, and Batch Prep Tools

Image Metadata, EXIF, and Privacy Cleanup Tools