Use the Batch Convert to Sepia tool to convert multiple color images to into sepia images.
Tip: If you want to preserve the original color images, create a new album, and drag the images into the new album to create copies of the original images, and then convert these copies to sepia.
To convert multiple images to sepia:
On the Browse tab, click the album to display thumbnail views of the images in the album in the Album View window.
In the Album View window, select the images that you want to convert.
To select multiple images, press and hold the <Ctrl> key and click the images.
To select multiple images in a sequence, press and hold the <Shift> key, click the first image in the sequence, and then click the last image in the sequence.
Click the down-arrow on the Batch button and choose Convert to Sepia.
A confirmation window opens stating that this operation cannot be undone. Click Yes to continue, click No to cancel.
Mark the Do not display this warning again check box, if you do not want to be warned when you perform an operation that cannot be undone.
Automatically Adjusting Multiple Images
Converting Multiple Images to Black and White