I recently joined Pixelfed and, considering there’s no algorithm, hashtags are the only way to be discovered.
I hate hashtag optimizing, but I also don’t want to upload my image to someone else’s random server before posting it to pixelfed, just to generate hashtags. Where should I look to find something I can host myself, or even something that runs natively on Android/Linux, that’ll generate hashtags/keywords for an image?
If you want software that analyses an image and produces tags that describe the image’s content, you want a combination of image recognition, image interpretation, text generation and a promp generator to link these three parts. There is no way that any single of these applications can be “lightweight”, not to speak of the combination.