ratcreature | a Tumblr question (Reply)

When a Tumblr post contains more than one picture, with certain numbers some of the images tend to be resized rather small with maybe only one image largish. And then when I click the images I just get an annoying slideshow that barely makes the images larger and actually makes large images *smaller*. Is there a way to click somewhere (or change a setting somewhere) that enables me to see the images at their proper size as they were uploaded? Or at least at the 500px width resize Tumblr does for single picture posts?