56 lines
2.5 KiB
Markdown
56 lines
2.5 KiB
Markdown
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---
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title: Adjust Colors
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description: Fine-tune brightness, contrast, saturation, hue, temperature, tint, gamma, and sepia in your PDF.
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---
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# Adjust Colors
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A full color grading toolkit for PDFs. Adjust eight independent parameters -- brightness, contrast, saturation, hue shift, temperature, tint, gamma, and sepia -- with a live preview that updates as you move each slider.
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## How It Works
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1. Upload your PDF file.
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2. The editor opens showing a preview of the first page and a color settings panel.
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3. Move the sliders to adjust each color parameter. The preview updates in real time.
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4. Click **Reset** to restore all sliders to their default positions.
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5. Click **Apply** to process all pages and download the adjusted PDF.
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## Options
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- **Brightness** -- Lighten or darken the entire page (-100 to +100).
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- **Contrast** -- Increase or decrease the difference between light and dark areas (-100 to +100).
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- **Saturation** -- Boost or reduce color intensity (-100 to +100). Setting to -100 produces a grayscale result.
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- **Hue Shift** -- Rotate the color wheel to shift all colors uniformly.
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- **Temperature** -- Shift colors warmer (yellow/orange) or cooler (blue).
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- **Tint** -- Add a green or magenta cast.
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- **Gamma** -- Adjust midtone brightness using a gamma curve. Values below 1.0 darken midtones; values above 1.0 lighten them.
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- **Sepia** -- Apply a classic sepia tone effect. Higher values produce a stronger brown tint.
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## Features
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- Eight independently adjustable color parameters
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- Live preview that responds immediately to slider changes
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- Reset button to quickly return to defaults
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- Processes all pages in the document
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- Works with any PDF content (text, images, graphics)
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## Use Cases
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- Brightening a dark scan or correcting overexposed pages
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- Desaturating a colorful document to reduce ink usage before printing
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- Applying a sepia tone to create an antique look for certificates or awards
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- Correcting color temperature on photos embedded in a PDF
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- Boosting contrast on faded or low-quality scanned documents
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## Tips
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- For a quick grayscale conversion, drag the saturation slider all the way to -100.
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- The gamma slider is particularly useful for improving readability of scanned documents where midtones are too dark or too light.
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- Like the other image-effect tools, this rasterizes each page. The output will be image-based, so text will not be selectable.
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## Related Tools
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- [Invert Colors](./invert-colors)
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- [Scanner Effect](./scanner-effect)
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- [Background Color](./background-color)
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