The app

It's a fairly small thing - a one-page app that loads a picture from photo gallery, inverts the colors and allows to store the result back to gallery.

Built for two reasons - first, I wanted to update my Flutter/Dart experience a bit, as I haven't dome much with it since releasing Pidging; but in addition to that, I wanted a tool to make photo negatives out of my photos (because it looks cool and entirely strange), and I couldn't find anything suitable and free available.

So here it is, the Picturevert - I'm in the process of uploading it to the app stores (it's always a huge pain), but once I do it will be freely available there.

Oh, and its code is also free (though not very pretty): https://github.com/hydralien/PictureVert