Bucket Tool...

in Questions
Hey gang. Total noob here so please bear with me. I am going through a tutorial video on how to create tiles. The example being used is rocks on dirt. The gentelman in the video used a the bucket tool to fill in all the rocks. My problem is that when I use the bucket tool, it fills in the entire tile. I can't for the life of me figure out how to get it to fill in only the rocks. Thank you so much your help...
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