How can I make color images into gray scale for forming flipbooks

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How can I make color images into gray scale for forming flipbooks?

Before outputting flipbooks with images, I want to convert the color ones to gray scale, how can I form gray scale flip books with ease?

You can use Flip Word (free download here) to form gray scale flip books with ease:
1. Add files: click "File->Add Images", the pages can be previewed in the Thumbnail or the List;
2. click "Image->Gray Scale", you can also optimize pages by rotating, cropping, de-skewing etc.;
3. Convert: Click "Publish", enter into output interface, you can set Book Proportions, Config, or Tool Bar here, then "Apply Change";
4. Output: Click "Convert to Flipping Book" to choose output format from *.html, *.zip, *.exe, or burn to CD, click "Convert" to output flipbook in your defined mode.