Show HN: Smart Color Replacer with HSV tolerance and edge snapping(irrationaltools.com)
irrationaltools.com
Show HN: Smart Color Replacer with HSV tolerance and edge snapping
https://irrationaltools.com/color-replacer/
https://irrationaltools.com/color-replacer/
• HSV tolerance (not RGB) - Catches all blues regardless of lighting while ignoring whites/grays that RGB tools pick up
• Magnetic lasso-style edge snapping - Uses Sobel edge detection so polygon vertices snap to object boundaries automatically. Green vertices = snapped, yellow = free placement
• Multiple independent color pairs - Replace 5 different shades with tight tolerances instead of cranking up one slider and getting color bleed
• Preserve shading toggle - Change a pink shirt to blue while keeping all fabric folds, shadows, and highlights intact
• Editable polygons - Drag vertices after closing, undo points, hide overlay while keeping selection active
• Remove colors → transparency - Perfect for background removal when you know the bg color
Problem with RGB: White (255,255,255) is mathematically close to Light Pink (255,182,193). HSV separates Hue from Saturation/Value, so you can target "all pinks" while excluding "anything low-saturation" (whites/grays).
Free, browser-based, no account needed. Built for e-commerce product recoloring and design mockups where simple flood-fill tools fail.