);
Frequency Separation is a Photoshop/GIMP method to separate texture from color/tone for advanced retouching. It uses two layers:
Use a soft Mixer Brush or the Lasso Tool with a Feather to smooth out color transitions and remove redness.
: It automates the complex manual setup of frequency separation, which typically involves multiple "Apply Image" and "Gaussian Blur" steps. How to Use FX-Ray Frequency Separation Retouching in Photoshop with the FX-Panel
// --- update all canvases from original image --- async function updateSeparation() if (!currentImageData) return; const radius = parseInt(radiusSlider.value, 10); const lowData, highData = computeFrequencySeparation(currentImageData, currentWidth, currentHeight, radius); // put low freq onto lowCanvas lowCanvas.width = currentWidth; lowCanvas.height = currentHeight; lowCanvas.getContext('2d').putImageData(lowData, 0, 0);
The tool is typically packaged as a Photoshop extension or panel. This allows users to toggle between different "frequencies" with a single click, rather than manually creating layers and clipping masks. Accessibility: