Spine displays/exports differently from SkeletonViewer

Ann

I have some fairly old .skel files (binary, version 3.6.53) and the accompanying .atlas and .png files, and my end goal is to export their animations as .gifs.

When viewing them in the SkeletonViewer-3.6.53 program, everything is displayed perfectly. However, when I try importing them into a project in Spine, a few random elements seem to be slightly resized.

Some other elements are also displayed incorrectly because unlike on SkeletonViewer, there is no premultiplied atlas alpha box to check (at least not on version 3.6.53).

These issues also show up in Spine's Preview window, and they persist even after saving the project and opening them in a later version.

How can I address these issues and export the files correctly?

Misaki

Ann I think you will find the following blog post helpful: Blog: Importing skeleton data
There is a FAQ section titled "Why are some of the parts smaller or larger than the correct size?". Could you please check to see if this applies to your case?

Ann

Misaki It did indeed, thank you! That solves my first issue.

Now, is there anything I can do about the premultiplied atlas alpha thing? Both the preview and export look the same as when the premultiply box is unchecked in SkeletonViewer, and I can't seem to find an option to enable it in Spine.

Misaki

Ann You can unpack the texture atlas with the latest Spine editor, this allows you to use the Unpremultiply alpha option when you unpack it. By using Unpremultiply alpha, pixels whose alpha has been multiplied can be restored to their original alpha values.

Ann

Misaki Perfect, it looks as intended now! I thought that option would have the opposite effect. Thank you so much!

Misaki

Ann I’m glad to hear that! Thank you for getting back to us 🙂