Step 1: Picture
I'm sick of my face, so lets use my roommate's.
Step 2: Tweeking Your Photo
First, Grayscale the image. Hint: play around with the contrast/brightness of your image, or Equalize the image to make the shadows and relief more pronounced.
After you are satisfied with the Grayscale, Posterize the image. REMEMBER HOW MANY LAYERS YOU DECIDE UPON. The less layers you posterize with, the easier the following steps will be. The more layers you use, the more impressive the effect will be. For this case, I chose 4 layers.
Play with your image until is just as your heart desires.
Step 3: Text
Open your text in Microsoft Word or a similar program. Remove all paragraphing so the text is uniform. I used a long exerpt (a chapter from Thoreau's "Walden"), but for this example I'll use something shorter, but of the same philosophical and poetic caliber, the lyrics to the Fresh Prince of Bel-Air theme song, repeated.
Step 4: Format Text
Choose a page size and text size that will give evidence to the large image while allowing the text to be readable.
To change page size in word, use Paper Size under Page Setup in the File menu. In this case, I choose 12" by 12" and size 8 Times New Roman font.
Step 5: Inserting Picture
Insert your posterized picture into your word file. Format the picture to be behind the text and to size of the margins (so directly behind the text).
You may have to format your page/font size a bit to make sure the image is large enough without distorting it.
Step 6: Change Text
So pick a few text formats you can create quickly; for instance, those letters above the darkest layer, I'll change to bold (Ctrl B), those below the lighter layer I'll underline (Ctrl U), those under the even lighter layer will be in italics (Ctrl I). Finally, the lightest layer I won't do anything to ("regular").
Now go line by line highlighting and changing the text appropriately. Yes, I know, its tedious.
You'll note that the smaller the text the more detail you will be able to see. If you want, you can change the spacing between the letters and lines to bring the text closer together without making the text it is too small to read.
Step 7: Adding Color (shading)
Once your entire text matches the underlying image in bold/italics/underline/whathaveyou, you can remove the picture from beneath the text.
Using the Find function (Ctrl F) we are going to replace all the altered text. Under the "Replace" tab, click the "More" button to expand the window. With the curser in the "Find" field, click the "Format" button and choose "Font". When the Font box pops up, choose your font and what format you want to change (bold/italics/whatever). Hit ok.
With the curser in the "Replace" field, do the same thing, but choose the font you want to change it too: i.e. if I'm finding all times new roman bold, I'm going to change it to times new roman regular, black. If I'm finding the italics, I'm replacing with regular, light gray, and so on.
Hit replace all.
Do this for each format. Try your best to have the shade of gray you choose match that in your posterized picture. (you may want to keep your picture underneath during this step, so you can see how colors line up.)
However: when you do your lightest color, you can't change the font to white, as then you can't read it. With 4 layers, I made the darkest black, the next darkest 75% gray, the next 50%, and the lightest (supposedly white) 25%.
Also, start adding shading with your "regular" font, if you have one. Otherwise, as you change Bold to Regular, and then finally change all the "regulars", you'll change everything you've already done. Remember our friend Ctrl Z...
Step 8: I'm a Cheater / Tips
1. I cheated. In order to produce a concise instructable, I only formatted a small area of the picture instead of the entire image.
2. Changing from bold/italics/etc. and back again changes the letter spacing. This can drastically alter the picture. Here are some ways to get around this:
A. Leave them in. If you pick font formats that do not change the flow of the image, you can leave them in after changing the colors. So stick with bolds for the darkest areas, italics for the lighter ones, and stay away from underlines or strike-throughs that will leave scars in your picture.
B. Center all text Problems come when the change in format changes the spacing from left to right. Centering all text before beginning will make any spacing issues move outward, minimizing and damage.
C. Use different formats Bold drastically changes letter spacing, Italics less so. Experiment with other formats that you can use with the Ctrl pad to see what changes more or less.
D. ALL CAPS transitions between large and small font agitates the spacing problem. With all words in caps, or none in caps, less problems should occur. You can also use "all caps" as a format instead of Bold, for instance.
Make the big image big, and the tiny text tiny. The larger the contrast in size, the more visual acuity and room for error you will have. In the one I've worked through here, the font was rather large for such a small image. Also, the bigger, the more impressive the effect.
Hang it in a prominent place! Remember to record how many double takes people make when they see it.