I have a 600 page book scanned in the two page manner you described. (It was an old book that is no longer in print and can't be purchased, so I borrowed my friend's copy to scan.) Following is what worked for me. I will try to give step by step instructions for a novice, so please understand that if you are an advanced user, it is not my intention to insult your intelligence. There are probably better ways to do this. This is the kind of instructions that I appreciate for myself. Now, let's try it: 1. First, copy your original scanned book file to another folder on your computer and use this copy to experiment with. Then if there is a problem or if something goes awry, you will still have your original scan. 2. Open your scanned book in Adobe (I am using Adobe 9.0 on a 64 bit Win 7 machine) and click on the "Pages" icon on the upper left of the black screen. 3. Click on the first page of your scanned book, then press and hold the "Shift" key on your keyboard and scroll to the last page of your book in the left pane and click it. This will select all the pages. 4. Now that all the pages are selected, click on the little "gear" icon that is located at the top of the pane above the selected pages and then select "Crop Pages" from the menu. From the dialog box that appears, experiment with entering measurements in the top, bottom left and right boxes until the image is centered and will split evenly at the center of the page break on the scanned book. (When I scanned my book, I aligned the left page with edge of the scanner with each scan, and the result was that the center of the scanned book was not the same as with the center of the scanned image since the scanner bed was a little larger than the book layed face down, thus resulting in the necessity to crop the image to make the center of the book even with the center of the image to be split.) As you enter different measurements in the boxes, you can see a preview of the results on the image. It might be necessary to "grab" the "Crop Pages" dialog box and move it to another area of your computer screen so you can see the scanned image. When you have the image cropped to your satisfaction, click "Ok". 5. Now we must set up the printer dialog to correctly print your book to an Adobe file. (Not on paper) (Note: When you are finished printing your book to the new Adobe file, it might be necessary to go back and change all your print settings to their original status.) 6. On the very top of your screen on the left side, click "File" and from the resulting menu, choose "Print Setup". From this dialog, click on the little downward pointing triangle to the right of the printer name that is highlighted. Click on "Adobe PDF" 7. Before closing the "Printer Setup" dialog box, click on the small downward pointing triangle in the highlighted box next to the "Size" setting. About halfway down the list of various paper sizes, click on "Half-sheet Letter", then to the right in the Orientation area, click the radio button for "Landscape" and then click "Ok". 8. We are now ready to print to an Adobe PDF file which will literally split your two pages per sheet book into a one page per sheet book. From the same "File" menu as before, click on "Print". 9. About 2/3 down the"Print" dialog box, click on the highlighted bar next to "Page Scaling" and then click on "Tile all pages" from the displayed menu. Note: The preview image shown on the right side of the "Print " dialog box should now show you an image of just where the pages will be split. (Reminder: When you are finished printing your book to the new Adobe file, it might be necessary to go back and change all your print settings to their original status.) 10. You are now ready to print your book to a PDF file with individual pages. Click on "Ok" to print your file. From that you can print a hard copy or whatever. 11. Hope this works as well for you as it did for me.
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