You can take a snapshot or capture an image sequence in the UV Editor using the -capture flag of the textureWindow command, and save your image or image sequence to disk.
To capture a single frame snapshot, do:
textureWindow -e -capture "fileName" panelName;
The following example captures the current snapshot of the UV Editor and saves it to a testSnapshot.iff file.
textureWindow -e -capture "testSnapshot.iff" polyTexturePlacementPanel1;
You can also capture an image sequence. An image is saved every time the editor is refreshed until you disable the capturing.
To capture an image sequence, use the -captureSequenceNumber flag (short name -csn) and specify the sequence number #. The sequence number must be positive, and your image sequence is saved with the pattern: fileName.#.ext. You must use -capture with -captureSequenceNumber.
The following example saves the image sequence testSnapshotSequence.1.iff, testSnapshotSequence.2.iff and so forth until you choose to disable the capture. A snapshot is taken per refresh, and the sequence numbers are not related to the frame numbers or time in the timeline.
textureWindow -e -csn 1 -capture "testSnapshotSequence.iff" polyTexturePlacementPanel1;
To disable the capture, set the sequence number to -1; or, set the file name to an empty string "".
For example:
textureWindow -e -capture "" polyTexturePlacementPanel1;
You can then play back your image sequence in FCheck; for example: