Yes, you can ask mdfind to show you all image files that do not have a Copyright field available. I used $PWD for test containment. The ‘c’ is for case insensitive content; ‘d’ will show diacriticals if they exist, and ‘w’ is for a word search.
mdfind -onlyin $PWD ‘((* != “Copyright”cdw) && kMDItemKind == “*image”)'
Changing that negation to equality “==“ will show you images that do have the Copyright field available.
The following says to show all image files without a copyright that used PhotoShop CS in the image creation. Using CS* would show all CS versions.
mdfind -onlyin $PWD ‘((* != “Copyright”cdw) && (* == “CS”cdw) && kMDItemKind == “*image”)'
Or, all the images without Copyright that use CMYK in their kMDItemProfileName field.
mdfind -onlyin $PWD '((* != "Copyright"cdw) && (* == "CMYK"cdw) && kMDItemKind == "*image")'
Or, all the images without Copyright, that may have a copyright string in the Authors field (as my Nokia N9 does).
mdfind -onlyin $PWD '((* != "Copyright"cdw) && kMDItemAuthors == "@*" && kMDItemKind == "*image")'
