Spine does not have a strict pixel limit for individual images, but the size of images you can use is often limited by your graphics hardware. Large images, such as 3492x3188 pixels, require significant video memory, and if your hardware cannot handle it, the image may not appear in the atlas. When exporting, even if you scale down the image, the original size still affects whether it can be processed. It's advisable to use smaller images or ensure your hardware can support large images.
