How to Convert a Photo to Black and White (That Doesn't Look Flat)

Desaturating a photo — dragging the saturation slider to zero — technically produces a black-and-white image. But it usually looks flat, muddy, and lifeless. Great black-and-white photography is about controlling how different colors translate to different shades of gray. Here's how to do it correctly.

Why desaturation produces flat results

When you simply remove all color from a photo, every color is converted to gray based purely on its luminance (brightness). Red and green, for example, often have similar luminance values — they just look different to our eyes because of their hue. When you desaturate, those two very different colors become nearly identical shades of gray, and the image loses the contrast and separation that made the original scene interesting.

Classic black-and-white film photography uses colored filters (red, orange, yellow, green) placed in front of the lens to make certain colors darker or lighter in the final image. A red filter makes red tones much lighter and blue/green tones much darker, dramatically increasing the contrast in outdoor scenes with sky and foliage. This control is what gives great black-and-white photography its punch.

The right approach: mix color channels

A proper black-and-white conversion adjusts how much each color channel (red, green, blue) contributes to the final gray values. This is called channel mixing or the black-and-white mixer.

Lightroom / Camera Raw: The HSL/Color panel becomes the B&W panel in black-and-white mode. You see sliders for each color (Red, Orange, Yellow, Green, Aqua, Blue, Purple, Magenta). Moving a slider brighter makes all pixels of that color in the original lighter in the B&W version; moving it darker makes them darker.

Photoshop: Layer → New Adjustment Layer → Black & White. The same color sliders appear. This is non-destructive, so you can always go back and adjust.

GIMP (free): Colors → Hue-Saturation, or Colors → Components → Channel Mixer. Less intuitive than Lightroom but achieves the same results.

Common channel mix recipes

Classic portrait (skin tones bright, background controlled):

• •Red: +50 to +70
• •Orange: +40 to +60
• •Yellow: +20 to +30
• •All others: default or slightly darkened

Boosting the red and orange channels brightens skin tones, adding luminosity and separation from darker backgrounds.

Dramatic landscape (dark skies, bright foliage):

• •Red: +30
• •Yellow: +50
• •Green: +30
• •Aqua: -30
• •Blue: -70 to -90

Darkening the blue channel makes blue sky dramatically darker, creating the high-contrast look associated with infrared photography and Ansel Adams-style landscapes.

High contrast street photography:

• •Red: -20
• •Yellow: -20
• •Green: +20
• •Blue: +10

Slightly darkening warm tones while lifting cool tones creates a grittier, more dramatic separation in urban scenes.

Tonal adjustments after conversion

Once you've set your channel mix, apply tonal adjustments to the overall image:

Contrast: Almost all B&W conversions benefit from slightly increased contrast. The goal is separation between mid-tones that might look similar in gray.

Whites and Blacks: Pull the blacks down to give shadows true depth. Lift whites slightly to ensure highlights are bright. Avoid clipping either end (losing detail in the brightest or darkest areas).

Clarity: A small increase in clarity (which adds micro-contrast around edges) gives B&W images a sharper, more textured feel — useful for portraits with skin texture you want to emphasize, landscapes, and architectural photography.

Grain: Light analog-style grain (Lightroom's grain tool, or the Add Noise filter in Photoshop) gives digital B&W conversions a more organic, film-like quality. Use sparingly — the goal is texture, not noise.

Vignetting

A subtle dark vignette (darker edges, brighter center) is a classic B&W technique that draws the eye toward the center of the frame. In Lightroom, the Effects panel has a Post-Crop Vignetting tool. Set it to -10 to -20 for a subtle effect, -30 to -50 for a more dramatic editorial look.

Quick conversion without Lightroom

If you don't have Lightroom or Photoshop, BG Bueno's Image Enhancer can adjust brightness, contrast, and saturation quickly. For a basic B&W with improved contrast:

1. 1Upload your photo.
2. 2Drag saturation to zero (or minimum).
3. 3Adjust contrast up to +20 to +30.
4. 4If skin tones look good, reduce brightness slightly for moodier results.
5. 5Download.

This won't give you the channel mixing control of Lightroom, but for simple conversions it produces much better results than a plain desaturation.

When to use black and white

B&W works best when:

• •The color in the original image is distracting or unappealing (garish clothing, mixed light sources with different color casts)
• •The image has strong geometric shapes, lines, or textures that become more prominent without color
• •The lighting is dramatic — strong shadows and highlights
• •You want a timeless, formal, or archival feel

B&W typically doesn't improve:

• •Images where the color is the point (food photography, product shots relying on color accuracy, travel photos of colorful scenes)
• •Images with flat, even lighting where the B&W version loses the separation that color was providing