Is there a software that will allow me to add my watermark to a large amount of photos in one fell swoop?
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Are you comfortable on a terminal? If so, that is by far your easiest option.
Take a look at the various methods associated with the ImageMagick toolchain. Something like this will be your best bet (reproduced below). The example provided would add a watermark.jpg on top of the image at 30% opacity.
EDIT: As liori pointed out in the comments, beware using this on anything with spaces or special characters in your filenames. It can have unexpected effects. Generally, it's safest if you only use numbers, letters, dashes, and underscores in filenames.
for pic in *.jpg; do
composite -dissolve 30% -gravity south watermark.jpg $pic ${pic//.jpg}-marked.jpg
done
George
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Please add relevant parts of those links to your answer with attribution. – Panther Aug 10 '17 at 18:41
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Sorry, I forgot to do so. Fixed. – George Aug 10 '17 at 18:43
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2Be careful with filenames with spaces. – liori Aug 10 '17 at 22:58