Converts images to blueprints of factorio lamps.

This isn't the most useful thing ever, but it's been a good exercise in putting together a webpage, which I hadn't done in about 10 years.

There are 3 basic options for choosing the number of lamps. You can specify a specific size to resize to, you can ask for an estimated number of lamps and the program will scale the image appropriately, or you can let the program use a default scaling, which makes the larger dimension 90 and the smaller dimension proportional.

On a reasonably new laptop it is also possible to set the program to not rescale at all, but even for a moderately sized image this is far too many lamps to be practical as a factorio blueprint. On a cheapass EC2 instance it completely nukes the memory to use more than ~100,000 lamps when building the blueprint. Note that while it would be easy to say, hey programmer do a better fucking job, actually it's the json to blueprint conversation itself that takes up all this memory, so there isn't a whole lot of room to squeeze in extra lamps.

Support is included for base colors, either with or without black represented as a powered down lamp, and for a couple mods. There is at least one more mod I know of which adds a bunch of colors, factorio-color-coding, but it adds new lamp types rather than new lamp signals, and I'm too lazy to accommodate that.

Currently there are two color conversion methods available.

The first is to use kmeans clustering to come up with K clusters, where K is the number of colors available (8 in the base game, for example). It then uses min cost flow to assign each cluster to a lamp color in such a way as to minimize the total distance from cluster color to lamp color. Super overkill, but it's better than randomly assigning colors.

The second is to assign each pixel to the lamp with the closest color. If done using L2 in RGB space, this is completely terrible and everything comes back black or white. Therefore I convert the image and the lamp colors to Lab space and use CIEDE2000 to find the closest lamp color for each pixel. This is actually quite slow, since the formula is so complex, so to save time I cluster the image into 100 clusters and assign each cluster to the nearest lamp color. The difference is basically unnoticeable.

Future work is even more overkill: add a deep learning segmentation model to first separate the image into foreground and background, then color those regions independently. That will be a good exercise for learning how to use the latest version of tensorflow or pytorch. The last version of TF which I used didn't have eager as default, for example.

I find that kmeans gives results that are amusing when used with the base color lamps. For example, turning my daughter's face blue & cyan because her stroller was pink. nearest neighbor actually looks kind of credible when used in combination with a mod. kmeans and mods winds up looking like you smashed a kaleidescope on the ground, and nearest neighbor and base doesn't really have enough color depth to look meaningful.

Disclaimers: not responsible for how slow your factorio map gets when you try to build a blueprint with too many lamps. Not responsible for the content of any of the images you convert to lamp blueprints.

Bugs? Complaints? Want to remind me how useless my app is? Hate Lantern Control? (Just play Blast Zone, it will all be okay)
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