Can't reduce an image's size

I have an image that I took in RAW with a Canon 5D. I then masked a large portion of the image using the adjustments brush. The result was what I wanted but the image is now very large. I exported the image to a DNG to retain editability. The resulting DNG is 53,679 kb. If I export the image to a JPG at 25% quality limiting the size to 2000 pixels on the longest edge I still get a 7,795 kb image.
I have had this problem with masking before. Is there any way to get rid of the bloat that the masking caused?
Jim

Thanks, you guys answered my question without directly answering it. I just did a set of tests to confirm my "lightbulb flash".
What I did not understand, and I don't know why, is all edits are stored as metadata. is this right?
To also satisy your interest as to why I needed masking. I attached two images. Both images contain the exact edits with the exception of the masking. When the picture was taken, the sun was on the city but clouds blocked the light from the background. The only way I could control the background brightness was to mask the sky behind the city skyline. The problem with masking is it is very size intensive.
The two attached images are with the "Copyright Only" metadata. They are 515kb and 471kb respectively.
The same two images with the same compression with "All Metadat" are 8,062kb and 489kb respectively.
The metadats of the masking represents 7,573kb. Amazing.
Thanks again for the help.
Jim
By the way, the final image with the masking will be used as the cover for a glossy magazine about San Francisco. I was just doing some web page updating to show the full photoshoot on my web site. You will be able to see it tomorrow at www.jpalik.com

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