I know it’s tempting to sometimes use those fancy options on your digital camera like sepia or B&W (my mom just cried a little because I called that fancy) — but please don’t. It’s much better to capture your image in full color. That way you gather as much information as possible while you’re taking the photo and then you have many more choices when you decide what to edit out, including colors.
Converting to black and white doesn’t seem like something that would require much practice, does it? There’s a Desaturate option right there in your image menu. But oh ho ho! Don’t worry! I’m here to help you take something that you normally do in a single graceful step and turn it into a whole multi-stepped process that you’ll feel intimidated and frustrated by.
Haha, just kidding. Sort of. But really, I promise not to make this scary or technical and it really will make a huge, dramatic difference in your photos. Swear. Like I tell my son: if doing it my way doesn’t improve things, I’ll buy you a big bag of candy. I’m not only a photoshop expert and a professional prostitute, I’m also an excellent parent.
Here are a couple of examples of the difference these steps can make:
Converted using sad and lame Image>Adjust>Desaturate

Converted like someone gave a crap:

The one on the left converted with care, the one on the right simply desaturated.

Ready? Let’s rock.
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Step 1. Have a radiant and gorgeous child, then take a picture of him and crop it.
Use my previous tutorial on taking dandy photos. Or, you know, use actual technically accurate information available in books and things. Whatever. Open your photo in Photoshop. Here’s the original we’re going to work on here:

Step 2. Create a duplicate layer.
Name it something useful like “b/w”
Either go to Layer>Duplicate layer or click on the tiny triangle at the top of your layers palette. A list of options will appear, and duplicate layer is one of them. Choose it.
Step 3. Open the Channel Mixer.
Go to Image>Adjust>Channel Mixer.
The Channel Mixer Thingy opens.
I know, you’re all oh my god! What are all these options? Output Channel? Constant? Source!? This is insane, Tiffany, You ARE INSANE.
Breathe. You can ignore most of it. This is the main area you need to worry about right here.

Step 4. Click the box that says “monochrome”.

Step 5. Slide the slider things for Red, Green, and Blue around until your image looks excellent.
You’ll see that the default setting is Red: 100%. Slide it back to 20%, and slide the Green and Blue channels back and forth — watch the changes in your image preview. Generally you want the output from the three channels to equal roughly 100%. Even if you want the image to be very bright, you’ll have more control if you work on that in the curves palette.
When you’re happy with your image, click OK.
This is the step that will require some play and practice. The best setting depends on what colors are in your photo, and what sort of mood you’re going for. Here are a few guidelines…
Pictures of people: Skin has a red undertone to it. So if you convert all of the red to white, people are going to look milky and bizarre:

It can be an interesting effect at times but most of the time you’ll want to have both red and green set to roughly 50%, and leave blue at 0%.
Pictures of blue sky with white clouds: You can get some cool dramatic skies by leaving red at 100%.

Pictures of trees and plants: If you slide the green channel up you can make plants look very delicate and ghostlike. For a more natural look though, stick to the red and blue channels.

Left to right: Full color, plain desaturation, channel mixer with red 100%, channel mixer with a mix of red and blue
But! There’s no formula… every image is different, and it of course depends on what element you’re trying to emphasize. For this picture of Graham, I focused on his eyes more than anything else. Here’s the setting I ended up most happy with:

And here is the result:

Goddamn I love that kid.
Step 6. Open the Color Balance Palette
Wait! Didn’t we just suck all of the color out? On purpose? Yeah, pretty much. But you can give your black and white photos a lot of richness by adding a subtle tint of color to them. A lot of times people won’t even realize that the color is there, but it makes a difference. You can make subtle (or not subtle, depending on how much color you add) shifts in the mood of the photo.
For example, here’s Mr.Graham with a warm tint:

With a subtle cool tint:

And with a not so subtle cool tint:

To get this effect, go to Image>Adjust>Color Balance.
The color balance palette will open.
Step 7. Adjust the color balance of the midtones
As we talked about before (”we” meaning me and my husband I mean; you weren’t there), your photos have shadows (the darkest areas), highlights (the brightest areas), and midtones (everything in between).
It’s just a personal preference, but I usually adjust the midtones first.

Notice that I pulled the top slider to the Red side… I wanted a warm effect, and red is warmer than cyan (greenish-blue). For the same reason, I pulled the Yellow-Blue slider towards the Yellow side.
Don’t click okay yet! You’re not done.
Step 8. Adjust the color balance of shadows.
Staying in the Color Balance palette, click the circle next to the word Shadows. Your sliders will all reset to the middle position, but your work on the midtones isn’t lost.

Something I like to do a lot of times on black and white images is pull the shadows and the midtones in different ways. So if I made the midtones warmer (more red and yellow), I’ll make the shadows cooler (more cyan and blue). And vice versa. It keeps the image looking more like a black and white image, and just seems to have more depth to my eye.

Black and white image with cool shadows and warm midtones
Step 9. Don’t adjust the highlights.
Look, I’m not the boss of you. If you want to play around with the highlights color balance, you do whatever you’re man enough to do. Most of the time I leave them alone because tinted highlights can start looking very unnatural and hypersaturated. I don’t know, it just looks wonky to me… but like a lot of features, can be used to get some neat effects if that’s what you’re going for.
Step 10. Click OK
Seems silly to have a whole step just for that, but there you have it.
And you’re done! Look at you, Mr or Mrs Fancyphotographerpants!
Next time I have time to do one of these: adjusting color balance on color photos. Spring break wooooooooo!