Animator PIC/CEL refers to a raster graphics format associated with the original Autodesk Animator animation software for DOS. The same file format is used for both .PIC and .CEL files.
Note that the successor to Animator, Animator Pro, also used .PIC and .CEL files, but the formats are different. PIC files use Animator Pro PIC format, and CEL files use FLC format. It seems there are also versions of Animator [Pro] that use GIF as their "PIC" format.
Files start with bytes
- Animator Pro File Formats, "PIC - Picture Files" and "Original Animator PIC Files" sections
- Information from FileFormat.Info and Corion.net
-  → AnimatorAKA.zip - Animator A.K.A. v1.02 (DOS software) - At least uses this format for .CEL files.
- Open source Animator Pro A.K.A. - Seems to support the format in some way; see "pic_header" in src/V/fli.h.
- Image Alchemy