Question: I'm looking for a way to convert low-resolution anime posters to higher resolutions, can you suggest a tool that can do this?

If you're looking for a service to upscale low-resolution anime posters, Let's Enhance is a good option. This AI image upscaling tool can convert low-resolution images into high-resolution and high-quality versions, including anime posters. It can be used in batch mode and can upscale to 4K or higher. The service is designed for creative professionals and eCommerce customers, but it can be used for print quality improvements and automatic product photo editing.

Another good option is Pics Enhancer. This AI-based service can automatically upscale low-resolution images, increasing detail and color saturation without manual editing. It can upscale images up to 16X resolution, so it's good for anime poster upscales. It can handle a variety of image formats, and offers both free and paid options, so you can use it for different purposes.

If you want a lossless approach, check out Bigjpg. This service uses deep convolutional neural networks to upscale images up to 16 times their original size without losing any color or detail. It's particularly good for anime-style artwork, so your images will look good and retain their color. The service offers several pricing options, and it deletes uploaded images automatically after three days for privacy.

Last, Remini offers a variety of options to improve visual content, including face enhancement, noise reduction and background detail enhancement. It can upscale photos and videos up to 2x without losing quality, so it's good for creating professional-grade anime posters. Remini also can be integrated easily with a simple API, so you can use it for different purposes.