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Apply linear transformation (a * input + b) to adjust image levels, brightness, and contrast
Execution
Fill in the form, run the tool, and review the result in one place.
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Tool usage guide
The Image Linear Transformation tool allows you to precisely adjust image brightness, contrast, and color levels by applying the mathematical formula result = a * input + b to your image pixels.
Background
A set of photos taken in low light appears too dark to use for a portfolio.
Problem
The images lack sufficient brightness and visibility in the shadows.
How to use
Upload the image and set the multiplier (a) to 1.2 and the offset (b) to 20 to lift the exposure.
multiplier: 1.2, offset: 20, channels: allOutcome
The image brightness is increased, revealing hidden details in the shadows while maintaining overall color balance.
Background
An image looks flat and lacks visual impact for a marketing banner.
Problem
The contrast is too low, making the subject blend into the background.
How to use
Apply a multiplier (a) of 1.5 to stretch the pixel values, increasing the difference between light and dark areas.
multiplier: 1.5, offset: -10, channels: rgbThe multiplier (a) scales the pixel values to adjust contrast, while the offset (b) shifts the values to adjust overall brightness.
Yes, you can provide comma-separated values for the multiplier and offset to target specific channels independently.
The tool supports JPEG, PNG, WebP, GIF, BMP, and TIFF formats for input.
Yes, especially if you choose a different output format or adjust the quality setting during the transformation.
You can upload image files up to 10MB in size.
Outcome
The image gains a sharper, more dramatic look with deeper blacks and brighter highlights.