Adjust Image Brightness
Adjust Image Brightness applies brightness(n%) while drawing the image. The default is 110%; 100% is nominally unchanged, values below darken, and values above lighten. A zero or invalid entry falls back to 100 because of the implementation's numeric default, and extreme values clip channels rather than recover exposure detail.
Runs locally — files stay on your deviceCan increasing brightness recover blown highlights or blocked shadows?
No. It scales rendered pixels and cannot restore detail absent from the decoded image.
Brightness filtering scales rendered channel values
Values can be clipped at display limits. This differs from raw-photo exposure adjustment, tone curves, or high-dynamic-range reconstruction.
How it works
Enter a percent, select an image, and process. Canvas sets brightness(percent), redraws at original dimensions, and exports PNG.
Key concepts
Zero falls back to 100%
Number(0) is falsy in the current default expression.
Clipping loses distinctions
Large increases can turn multiple bright values into the same maximum.
When to use it
- Make a quick display-oriented lightness adjustment.
- Create a lighter or darker derivative.
- Compare simple filter percentages.
When not to use it
- Do not use for raw exposure recovery.
- Do not expect highlight/shadow reconstruction.
- Do not assume zero produces black in this implementation.
Worked examples
Slight lift
- Input
110%- Expected output
Brighter PNG
The default increases brightness by roughly ten percent.
Darken
- Input
70%- Expected output
Darker rendering
Channels are scaled downward.
Zero
- Input
0%- Expected output
Effectively 100%
The implementation falls back.
Common mistakes
Using zero for black
Zero triggers fallback. Correction: Use a small positive percentage or another editor.
Confusing exposure and brightness
Raw pipeline controls are absent. Correction: Use raw-editing software.
Pushing until clipping
Detail can merge. Correction: Inspect histogram and pixels elsewhere.
Best practices
- Use moderate values.
- Inspect highlights and shadows.
- Keep the original.
Related operations and differences
Add Text Watermark to Image
Choose Add Text Watermark to Image when you need to place a text watermark in the lower-right corner.; use Adjust Image Brightness specifically for brightness.
Adjust Image Contrast
Choose Adjust Image Contrast when you need to increase or decrease image contrast.; use Adjust Image Brightness specifically for brightness.
Adjust Image Saturation
Choose Adjust Image Saturation when you need to control the intensity of image colors.; use Adjust Image Brightness specifically for brightness.
Crop Image
Choose Crop Image when you need to crop an image to an exact local pixel rectangle.; use Adjust Image Brightness specifically for brightness.
Flip Image Horizontally
Choose Flip Image Horizontally when you need to mirror an image from left to right.; use Adjust Image Brightness specifically for brightness.
Flip Image Vertically
Choose Flip Image Vertically when you need to mirror an image from top to bottom.; use Adjust Image Brightness specifically for brightness.
Limitations and privacy
- Canvas brightness filter only.
- Zero/invalid becomes 100%.
- No raw data, histogram, exposure stops, masks, preview, or clipping warning.
Selected images are decoded and processed locally in this browser.
Frequently asked questions
What is neutral?
100%.
What does 0% do here?
It falls back to 100%.
Can lost detail return?
No.
Is output PNG?
Yes.