I'm curios what happens to the size of the host image after an invisible watermark has been inserted. I'm guessing the size will increase but by how much?

For example, the cover image to be inserted is 1kb and the host image is 2kb. Since your adding additional information the size will be 3kb after the embedding process?

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Depends on how the watermarking is done. Some watermarks use the low order bit of the pixel (thus changing the color slightly, but not enough that you'd notice) and won't change the size of the image at all.

I'm going to embed the watermark in the middle-band coefficient of DCT. My host image is colored (512 x 512) and my cover image (64 x 64) is binary image.Will that affect the size of the after I watermark has been inserted?

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