The instructable said to draw the image on the book; my problem is a word or image might get complicated and I am horrible at drawing. Searching the internet led to several images but no English instructions. I did find this page in French and used the screenshots to recreate instructions for folding using a graphics program I had available. It has also been posted as an instructable.
The beauty of this project is its simplicity. The image is made by simply folding the two corners of each page. No cutting, gluing, or special equipment needed.
**NOTE** When trying to find instructions for book folding I found the above referenced page in French, did not see the translation. I used the screenshots to infer the method but did not originally reference that page. That was wrong of me and the author has my apologies.
Step 1: Materials and Tools
Ruler- I used an engineering scale with 1/10th inch markings for ease of measuring
Pencil or pen
Plastic or stiff paper for folding template
Computer with basic graphics program
Step 2: Select Book
This was a trial run at book folding so I chose an outdated paperback reference book . For future projects I will use hardback books for added support.
Step 3: Design Basic Image
Set canvas height to the height of the book and set the width wide enough to fit the word or image. Insert the image or select the font you would like. For this project I used the word Love in Coopers Black font. This font has thick letters that will show up well. Type word in a size appropriate to the height and center word or image. Set the contrast to 100 (under Adjustments tab) to ensure solid color with no gray edges.
Step 4: Prepare the Image
Select Resize in Image tab. Do not select Canvas Size, this will cut off the image. Make sure "Maintain aspect ratio" is NOT checked. This will allow the width to change without effecting the height. Set width to the number of sheets (one pixel per sheet), keep height the same, and set resolution to your ruler scale (10 pixels per inch in this case). The word or image should distort to wider than the original. Once folded the final image scale can be adjusted based on how compressed the book is.
Select show grid when zoomed and zoom in until grid is visible, only a portion of the image may be visible. You will see empty (white) squares and filled (black) squares. Some columns will have one solid line of filled squares, others will have two or more lines. In columns with multiple sections filled, you will delete sections so that only one remains. Alternate the deleted sections top, middle, bottom, top, etc. When complete this will cause each section to be filled in without having to cut the pages.
Step 5: Make Excel File
When finished the number of filled row should be less than the number of sheets. Divide the number of extra sheets by two, this will tell you how many pages before and after the image will be left. These can be folded or not folded depending on what looks best when finished. Count down the number of blank sheets indicated before the image. Enter the page number in the first PAGE row. Add two to the page number in the next row and then fill down the remaining rows. This will give you a reference so you do not lose your place.
Attached is a file used to make the image I made. Book must have at least 307 sheets and be 4.5" in height. Fill in sheets, first folded page and height and it will do the rest.
Step 6: Template
Step 7: Folding
Fold the corners of the page in along the marks. First sheet done, only a few hundred more to go. Repeat for each sheet, if you lose your place simple look at the page number you are on and find it in the excel table. Continue until all pages are finished. Adjust looseness of the book until the image looks right.