Blur Background Tool
Blur the background around a manually defined central focus region in a local image. This is a deterministic image effect and does not claim automatic AI subject detection.
Use the Blur Background Tool
Keep a manually defined central focus region sharp while blurring the surrounding background locally. This is not automatic AI subject detection.
File processing and generation happen locally in your browser; this batch does not require an external processing service.
This tool uses a manual central focus mask, not AI segmentation. It will not automatically trace hair, people or irregular subjects.
How to use it
Start with the realistic worked example, replace it with your own data or local file, inspect the generated result, and verify the important assumptions before using the output.
How the Blur Background Tool works
Keep a manually defined central focus region sharp while blurring the surrounding background locally. This is not automatic AI subject detection. The methodology documents the real Build 0198 production workflow, its verified QA fixture and the limits that prevent generated or transformed content from being represented as independently verified fact.
Calculation breakdown
ToolLott will explain the current inputs and displayed result here.
Assemble or transform the requested content from explicit user inputs
The Blur Background Tool validates its supplied fields/options, performs the page-specific operation — Keep a manually defined central focus region sharp while blurring the surrounding background locally. This is not automatic AI subject detection — and returns the Build 0198 verified outcome “Background blur: 12px outside a central ellipse (45% x 65%)”. The tool does not silently claim external research, authorship, originality, accuracy or legal/academic acceptance.
| Symbol / input | Meaning | Unit |
|---|---|---|
file | Source image | user input |
blur | Blur radius (px) | user input |
shape | Focus shape | user input |
focusWidth | Focus width (%) | user input |
focusHeight | Focus height (%) | user input |
Step-by-step method
- Validate the required text, fields, options or source content shown on the page.
- Keep a manually defined central focus region sharp while blurring the surrounding background locally. This is not automatic AI subject detection.
- Review and edit the generated/transformed output before sending, publishing, submitting or relying on it.
Worked example
Aisha, a content and operations specialist, A portrait has a busy office background. The subject is centred, so the editor wants a simple central focus mask that keeps the person sharp while blurring the surrounding area.
Example inputs
- Blur radius (px): 12
- Focus shape: ellipse
- Focus width (%): 45
- Focus height (%): 65
Calculation / processing
Use the verified QA fixture: Blur radius (px): 12; Focus shape: ellipse; Focus width (%): 45; Focus height (%): 65.Apply the production assemble or transform the requested content from explicit user inputs workflow exactly as described on this page.The production QA fixture reports: Background blur: 12px outside a central ellipse (45% x 65%).
The result is the verified Build 0198 output for this exact scenario. It should be interpreted with the displayed inputs, assumptions and limitations rather than as context-free advice.
Assumptions
- The user has the right to use the supplied source material and provides the factual context required by the tool.
- Generated or transformed text is based on the explicit inputs and documented local/template rules; hidden factual verification is not assumed.
Limitations
- Generated text can be incomplete, awkward or unsuitable for a specific audience and must be reviewed by the user.
- For plagiarism, grammar, translation, career, academic, legal or professional use, this utility cannot guarantee originality, acceptance, semantic equivalence or compliance beyond its documented checks.
Common questions
What does the Blur Background Tool actually do?
Keep a manually defined central focus region sharp while blurring the surrounding background locally. This is not automatic AI subject detection. The methodology documents the production calculation or transformation rather than a generic description.
Does the worked example match the real ToolLott tool?
Yes. It is tied to the passed production QA fixture for Build 0198, including the expected summary.
What should I verify before relying on the output?
Check the entered values, stated assumptions, support boundaries and any authoritative sources linked on the page; independently review high-stakes use.
Methodology sources
This page uses basic mathematical or ToolLott implementation logic that does not require an external factual source. The worked result is still tied to the production tool and QA example.
Related ToolLott tools
A realistic way Aisha could use this tool
Aisha is a content and operations specialist.
A portrait has a busy office background. The subject is centred, so the editor wants a simple central focus mask that keeps the person sharp while blurring the surrounding area.
For this case the entered data is blur = 12; shape = “ellipse”; focus width = 45; focus height = 65. The page evaluates that exact set and reports Background blur: 12px outside a central ellipse (45% x 65%); the example therefore demonstrates the method with real values rather than describing a vague before-and-after story.
This produces Background blur: 12px outside a central ellipse (45% x 65%). In practical terms, Aisha can keep a manually defined central focus region sharp while blurring the surrounding background locally. This is not automatic AI subject detection using a result tied to the shown inputs instead of an unexplained recommendation. The page also keeps this limitation explicit: No new external service or backend is introduced.
Fictional scenario using realistic example data. For Ready tools, the worked result is tied to the tested example shown in the tool. Replace the figures with your own inputs and independently verify important professional, financial, legal, health or safety decisions.
What this tool is for
Use it to keep a manually defined central region sharp while blurring the surrounding area locally; it does not perform AI subject detection.
It sits within ToolLott’s Image Tools collection, where you can also pick colours, compress, crop, resize, rotate, watermark, convert and prepare images for common web and document uses.