Photo Filter Studio — Real-Time, GPU-Accelerated

WebGPU Filter Studio is a real-time photo finishing tool that runs on your GPU. It chains a tone-mapping pass (exposure, contrast, saturation, warmth, gamma), a separable Gaussian blur, and a finishing pass (sharpen, vignette, film grain) entirely in WGSL fragment shaders. Each parameter update re-renders the full chain in milliseconds, so sliders feel like a desktop editor rather than a web upload form.

The pipeline is three WGSL fragment passes. Pass 1 applies exposure (power-of-two scaling), contrast (around mid-gray), saturation (mix toward luminance), warmth (R/B offset), and gamma. Pass 2 is a horizontal Gaussian blur with weights computed from the radius. Pass 3 reuses the blur shader for vertical sampling, giving a proper separable Gaussian. Pass 4 is finishing: a five-tap sharpen, radial vignette, and hashed film grain. Each pass writes a new rgba8unorm texture, and the final result is read back, drawn to a canvas, and offered as a PNG.