Overview
Introduction
This tool adds a flat colored overlay across an entire JPG, entirely in your browser, by alpha-compositing a chosen tint color at a chosen opacity.
It's a simple, predictable way to add a colored shade or vintage-style cast to a photo without touching individual color ranges.
What Is JPG Color Shade Adder?
A client-side color overlay tool that blends every pixel toward a single flat tint color by a fixed opacity percentage, the same math a semi-transparent colored layer would produce in any standard image editor.
Because the blend amount is identical for every pixel, the result reads as a uniform colored film over the whole photo rather than a selective or hue-preserving recolor.
How JPG Color Shade Adder Works
Each pixel's R, G, and B channels are linearly interpolated toward the tint color's corresponding channel, weighted by the opacity percentage divided by 100.
At 0% opacity nothing changes; at 100% opacity every pixel becomes the flat tint color, with the original image fully obscured.
When To Use JPG Color Shade Adder
Use it to add a stylistic colored cast to a photo: a warm sunset tint, a cool blue mood, a brand-color overlay for a marketing image.
It's also useful as a quick duotone-adjacent effect when paired with a grayscale conversion beforehand.
Often used alongside JPG Color Replacer, JPG Color Remover and PNG Color Tone Changer.
Features
Advantages
- Simple, predictable uniform blending that's easy to reason about.
- Runs entirely client-side; your image is never uploaded anywhere.
- Full control over both the tint color and opacity strength.
Limitations
- The blend is uniform and doesn't respect the image's own brightness or color variation the way a hue-preserving recolor would.
- At high opacity, most or all of the original image detail is lost under the flat tint.
Examples
Best Practices & Notes
Best Practices
- Start around 15-30% opacity for a subtle mood effect that keeps the photo clearly readable.
- For a duotone look, convert to grayscale first, then apply this tool's tint on top.
Developer Notes
addJpgColorShade is a pure lib function: it parses a 6-digit hex tint color, validates opacity (0-100), and linearly interpolates each pixel's RGB channels toward the tint by opacity/100, leaving alpha untouched since the JpgPreviewPanel flattens to a matte regardless before export.
JPG Color Shade Adder Use Cases
- Adding a mood-setting color cast to a photo
- Creating a bold brand-color overlay for marketing images
- Building a duotone-style effect on top of a grayscale conversion
Common Mistakes
- Setting opacity too high and losing most of the original image's readability.
- Expecting a hue-preserving recolor: this blends uniformly toward one flat color regardless of the pixel's original shade.
Tips
- Preview at a few opacity levels to find the point where the tint reads as intentional rather than overpowering.
- Combine with the JPG Color Reducer beforehand for a more graphic, poster-like combined effect.