I tried to create an object style for a border around an image. It worked for one image, but then when I tried to apply it to another image, the dimensions were resized. Is there a way to create a image border object style that won't resize the image?
Yes, just remove the entries for size (setting them to As Is) and update the style. From then on, applying the style should not impact the size property, and any others that have been set to As Is.
Ah, I found the answer! In the Object style designer, you need to click the reset button in the top right corner (a circular arrow) in the Dimensions tab to remove the dimensions for the Object style.