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protip #1: before saving an image from pixiv, press the v key when viewing in pixiv to open the full size of the image in a new tab. save the pic from there. otherwise your filenames will have master1200 at the indicating they're thumbnails.
protip #2: before saving an image from tumblr, right click the image and "open in a new tab". whatever the number is at the end of the url, if it isnt 1280, you are not viewing the full size of the image. change it to 1280 to get the full size, then save it.
you're welcome. now please for the love of god everyone stop uploading thumbnails.