Show HN: Fun sketch – Bring your sketches to life

Show HN: Fun sketch – Bring your sketches to life(funsketch.kigun.org)

15 points by mishu2 189 days ago | 11 comments

Hello HN,

I created a simple website which lets children (of all ages) sketch something and then animate it using AI. It's a small hobby project because I wanted to see what all the hype is about.

No account required (but because the sketch app allows image uploads and we all know we can't have nice things on the Internet, I will be moderating the submissions before showing them on the front page).

Stack: Excalidraw, Django, Postgres, Redis for caching, ComfyUI for the image to video workflow (Wan 2.2 14B I2V).

Let me know what you think. Merry Christmas!

forgingahead 189 days ago |

Nice work! What hardware are you running ComfyUI on, specifically the Wan2.2 workflow? It must be expensive having a GPU running for a hobby project like this?

mishu2 189 days ago | |

Thank you. I'm running it locally on a 4090 (24 GB).

I was running into OOM issues with Wan 2.2 before, but I found the latest version of ComfyUI can now run it (using about 17 GB of VRAM for what I assume is a quantized model?).

mishu2 188 days ago |

Thank you everyone for taking a look. The website had around 1,200 visitors and received over 90 sketches over the past 24 hours, and I'm happy to say I could approve almost all of them (all except 2 'rocket' sketches which were starting to look a bit dubious, but all in good fun).

The results look very interesting to me, and I think as a next step I will look into adjusting the prompts (both positive and negative). On the one hand, I'd like to keep the sketch/drawing look rather than going full photorealism as some of the videos do, on the other hand I don't want to restrict the users' creativity too much.

I plan to simplify this further and optimize it for tablets. Some friends said they'd like to have their kids try it out it and I like the idea, as by having to sketch it keeps the user in a more active role.

Please let me know if you have any other suggestions.

fouc 189 days ago |

Pretty good, I've noticed the animation tends to veer off / hallucinate quite a lot near the end. It is clear that the model is not maintaining any awareness of the first image. I wonder if there's a way to keep the original model in the context, or add original image back in at the half way mark.

mishu2 189 days ago | |

Thank you. I've noticed that too, and also that it has a tendency to introduce garbled text when not given a prompt (or a short one).

This is using the default parameters for the ComfyUI workflow (including a negative prompt written in Chinese), so there is a lot of room for adjustments.

fouc 188 days ago | | |

Oh I was wondering why some of the hallucinations introduced Chinese text/visuals, I'm guessing that might be due to the negative prompt.

VierScar 189 days ago | |

Could do something funky like convert it to grayscale, add a 4th "colour" channel and put the grayscale image it that

mishu2 188 days ago | | |

I'm actually trying to reduce the 'funkyness', initially the idea was to start from a child's sketch and bring it to life (so kids can safely use it as part of an exhibit at an art festival) :)

There's a world of possibilities though, I hadn't even thought of combining color channels.