• 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.

Comments URL: https://news.ycombinator.com/item?id=46656219

Points: 1

# Comments: 1

I’ve been building a few color and image-related tools with a focus on ease of use, solid UI/UX, and correctness as a hobby project.

What makes these different from other online tools? Very often I needed free, simple, yet powerful utilities for these little tasks and couldn’t find anything that fit, so I ended up building them myself (100% client-side, no sign-ups required!)

Color Palette Generator: Uses the OKLCH color space (instead of RGB) to generate perceptually the most distinct colors for a given scheme. It also includes sequential palettes and palette generation from an image for convenience.

Smart Color Replacer: Uses HSV-based fuzzy matching, supports multiple input-output color pairs (something I couldn’t find elsewhere), and preserves original highlights and shadows by replacing only hue. It also includes a “magnetic lasso”-style tool that snaps selection vertices to detected object boundaries (not perfect yet - I’m working on additional selection modes) to limit replacements to specific areas.

Color Mixer:A pretty simple mathematical Color averager, but allows you to input colors in multiple spaces (just write anything in the textbox, or 'bulk' copy and paste!), and adjust input and output colors quickly by clicking on the swatch.

Image Blender: Fast, simple, no frills client-side image blending. Change opacity if you need.

I’d love to hear your kind suggestions or feedback!

Comments URL: https://news.ycombinator.com/item?id=46620727

Points: 2

# Comments: 0

- I don't know about that, may be, may be not, but I don't know of any such plan in the short term at least. It gives University students a free 'professional' license so there's that too.

> Just fill pattern and text are always a struggle.

Feel free to create a support ticket about your pain points. Everyone can easily do that, and Onshape is surprisingly more responsive to support tickets than many other companies.

What annoys me greatly though is kids coding various 'fancy' functional paradigms for data transformation without realizing their performance implications, still thinking they've actually done the 'smarter' thing by transforming it multiple times and changing a simple loop to three or four loops. Example : Array.map.filter.map.reduce. Also when talked about it, they have learned to respond with another fancy term : "that would be premature optimization". :|

I don't know if I should feel happy or concerned about the security policies of a company that has already given 2 million USD in bug bounties :).

> The problem is, where does a file go in between the time you cut and you paste? : - It doesn't have to go anywhere, it's just "marked for" 'cut', just like a file marked for copying doesn't go anywhere until you paste it. All other Operating Systems have got it exactly right for eons. If you accidentally copy something else, that mark is removed, and the file is still happily sitting where it was. (Windows even shows it visually in their File Explorer). No safety hazard. I don't understand your other point - be it my entire life's work, it's always at one place or the other. It can't go to a third place, and in any case Undo and Bin are always there. At least in Windows moved files go back to their previous places on Undo. This is a much more intuitive default, making sure a recovery option is always there for exceptions.

> `View` → `Show Path Bar` : Yes, that's what I had done, but imagine having a proper address bar which both tells you where you are, and is editable so can be used to paste a new address to go to. That will be much more intuitive, and that's what other OSs have done.

> Click the gear in the toolbar → `paste`. : I don't see a gear icon, but sure, I can also do it using Cmd+V and also from the Edit Menu. But a 'Paste Item' is still there in the Context menu that is unusable in a lot of situations. Wasn't Steve Jobs really particular about pixel perfectness? I don't see that here.

I didn't even talk about my other problems with this OS especially when you use non-Apple hardware. I just want to point out that unlike what a lot of people believe, Windows (and even modern Linux) UI is much more intuitive and arguably causes less repetitive strain injury to our hands with more frequent OS operations made easier. The only thing I had found great in Mac's UI was Spotlight (though even that leaves a lot to be desired), but Windows now offers that too under their new PowerToys fleet of applications (less capable in some places but it should only get better) and I think people should give it a try.