Image Color Splash & Selective Monochrome Generator

Isolate vibrant selective colors on black-and-white photos with interactive brush masking and smart color detection. 100% in-browser processing.

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🔒 100% Local Processing — Color splash brush mask rendered entirely in your browser memory. Nothing is ever uploaded.

Drop any photo to create a Color Splash & Selective Monochrome effect

Paint to selectively reveal vibrant colors over moody black-and-white. Use smart color presets to auto-isolate reds, blues, and yellows. Paste with Ctrl+V

How to use this tool

Upload your image (JPG, PNG, WebP, SVG) or paste directly from your clipboard using Ctrl+V / Cmd+V.
Your image is instantly desaturated into a clean black-and-white base using perceptual Rec. 709 luminance.
Select the Color Brush mode to paint directly on the canvas and reveal the original vivid colors underneath.
Switch to the Eraser (Monochrome) mode to fix mistakes and paint grayscale back over unwanted areas.
Adjust Brush Size (5px to 120px) and Feather Softness (0% to 100%) for razor-sharp boundaries or smooth, seamless transitions.
Use Quick Color Selection presets (Keep Reds, Keep Blues, Keep Greens, Keep Yellows) to auto-detect and isolate specific colors instantly.
Click Invert Splash Mask to invert which regions are in full color versus monochrome with one click.
Inspect the Before / After comparison slider or zoom in on the canvas preview to refine fine details.
Download your final color splash artwork at full native source resolution as a lossless PNG or high-quality JPEG.

Frequently asked questions

Quick answers about file privacy, processing modes, formats, and device support.

Color Splash (also known as selective desaturation or partial monochrome) is a photographic technique where most of an image is converted into black-and-white while a single focal element (such as a red umbrella, yellow taxi, bright flower, or colorful eye) retains its vibrant original color. This dramatically draws the viewer's attention to the primary subject.

The tool creates a dual-layer compositing system entirely in your browser using an HTML5 Canvas. A base grayscale layer is generated via perceptual Rec. 709 luminance (0.2126R + 0.7152G + 0.0722B). An alpha mask canvas tracks your interactive brush strokes, seamlessly blending between original color and monochrome without any external server processing.

When you click a quick color preset (such as 'Keep Reds' or 'Keep Yellows'), the engine calculates the Euclidean color distance and hue separation for every pixel in the image. Pixels matching the selected color family are automatically revealed in full color, while neutral and contrasting pixels remain black-and-white.

Yes. The Brush Softness slider controls radial gradient feathering on the brush tip. A lower setting gives a hard edge suitable for geometric objects and buildings, while a higher setting creates a soft, natural falloff ideal for hair, foliage, and skin.

Yes. Clicking the Invert Mask button instantly swaps the colored and black-and-white regions, turning the colored subject monochrome and restoring the colorful background.

Yes. When you download your image, the engine reproduces your exact brush strokes and color selection thresholds onto a full-scale offscreen canvas matching the native source dimensions, guaranteeing crisp edges and zero downsampling.

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