Unable to create a duplicate layer scanned image file
I just have scanned a few documents, tif, bmp and png in various resolutions.
Regretfully duplicate layer is greyed out, no matter which one I select.
OTOH when selecting some other (non-scanned) png file, duplicate layer is not greyed out.
Within the same 'Photoshop session'
(scanner software not running, the scanner us shut down, the file is not read only)
Any suggestions?
Thanks!
(Photoshop CS6)

