The Art of Emoji Blending: How Canvas Compositing Works
Ever wondered how Emoji Kitchen creates those wild mashups? We break down the Canvas API techniques. Emoji Kitchen looks simple on the surface — pick two emojis, choose a blend mode, download. But under the hood, we're using some clever HTML5 Canvas API tricks to create each effect. How Emoji Rendering Works Browsers render emojis as colored vector glyphs using system fonts (Apple Color Emoji on macOS, Segoe UI Emoji on Windows, Noto Color Emoji on Android). The Canvas API can draw text including emojis using ctx.fillText(emoji, x, y). By setting a large font size, we essentially render the emoji at any resolution. Fusion Mode — Both emojis are drawn centered on the canvas with a slight offset controlled by the X/Y sliders. The second emoji is drawn at 85% opacity, creating a natural overlay effect. This is the simplest but most versatile mode. Ghost Mode — The second emoji is drawn at 30-50% opacity with a larger font size, creating an ethereal overlay. It's called "Ghost" because the second emoji appears to haunt the first. Split Mode — Uses ctx.clip() to divide the canvas into two halves. The left half shows emoji 1, the right half shows emoji 2. Perfect for "vs" style comparisons. Surround Mode — Emoji 1 sits large in the center while emoji 2 orbits around it. Read the full article on Emoji Kitchen, then try the ideas yourself in the emoji kitchen editor or browse examples in the mashup gallery.