Generates a "complete" image starting from an image composed of two interlaced fields (extracted from a video animation). This command is only applied to the current image in the current layer. The order argument may be equal to 0 or 1. With its default value (0), this command will copy even lines in the image onto odd lines (line 0 onto line 1, line 2 onto line 3, etc.). If it is equal to 1, it copies odd lines in the image onto even lines (line 1 onto line 0, line 3 onto line 2, etc.).