I had a client call me out on a Friday afternoon once. She’d received the final retouched portrait, opened it on her laptop, and the skin tones looked greenish and flat. I opened the same file on my main monitor and it looked perfect. Same file. Two completely different images. That’s the moment I stopped treating color management as optional and started treating it as the first thing I set up on any project.

If your colors look great in Photoshop but drift when you export, send to a client, or print, you’re not doing anything wrong artistically. You’re dealing with a color science problem, and it has a real solution.

What’s Actually Happening When Colors Shift

Photoshop works inside a color space, which is essentially a defined set of rules about what a specific RGB or CMYK value actually looks like as a visible color. The two you’ll run into most often are sRGB and Adobe RGB. Adobe RGB has a wider gamut, meaning it can describe more colors, particularly in the greens and cyans. sRGB is smaller but is the standard that browsers, phones, and most client screens expect.

When you edit in Adobe RGB and export without converting, you’re handing someone a file with color coordinates that their software will interpret using sRGB rules. The result is washed-out, dull, or hue-shifted colors. The numbers in your file haven’t changed. The interpreter has.

The fix starts before you open a single image. Go to Edit > Color Settings. Set your working RGB space to sRGB if you’re editing for screen or web. If you’re delivering to a print shop that has sent you a specific profile, use that. Check “Ask When Opening” under Profile Mismatches so Photoshop flags files that don’t match your working space instead of silently converting or ignoring the conflict.

Building a Repeatable Correction Workflow with Curves

Once your color management is dialed in, the actual correction work starts with Curves. I’ve had long, friendly arguments with students about whether Curves or other tools are the better approach, and my answer is always the same: Curves is the most direct conversation you can have with the tonal and color data in your image.

Add a Curves adjustment layer, not a direct adjustment. This keeps your correction non-destructive and editable at any point. In the Properties panel, you’ll see a histogram and a diagonal line. Here’s the basic correction sequence I use on almost every image:

First, set your black and white points. Hold Alt (Windows) or Option (Mac) while dragging the black input slider inward until you just see detail clipping. Do the same with the white slider. This maps the actual tonal range of your image to the full display range, which immediately improves contrast and punch without touching color yet.

Second, switch from the RGB channel dropdown to each individual color channel. Red, Green, Blue each have their own curve. If the image is too warm, pull the Red curve down slightly in the midtones, meaning click the center of the line and drag it down just a few points. Quantify this: a 5 to 10 point shift in the midtones is often enough to correct a visible color cast. Any more than 15 points and you’re usually overcorrecting.

Third, use the gray eyedropper inside the Curves dialog and click on something in your image that should be neutral gray. Photoshop will calculate the color cast and correct it automatically across all three channels. This single step saves me around five minutes per image on portrait batches.

Checking Your Work with a Threshold Layer

Here’s one I didn’t learn until about three years into doing retouching work for agencies. Add a Threshold adjustment layer above everything and drag its slider all the way left until the canvas goes white, then slowly drag right until the first black pixel appears. That pixel is your darkest shadow point. Note where it is, then drag left until the last black pixel disappears. That’s your brightest highlight point.

Sample those two spots with the Color Sampler tool (Shift-click), then delete the Threshold layer. Now you have readout points that let you watch your shadows and highlights numerically in the Info panel as you work. If your shadow point reads something like R:12, G:10, B:14, you have a slight blue cast in the shadows. Small numbers, real information.

Exporting Without Losing the Work You Just Did

All that correction disappears if you export incorrectly. When you go to File > Export > Export As (not the older Save for Web, though it still works), check the “Convert to sRGB” box if your working space was Adobe RGB. This is not automatic. Photoshop will not warn you if you skip it.

For JPEG exports targeting web or client delivery, I use quality 85. That’s a specific number I’ve landed on after years of comparing file size to visual quality. At 85, a typical 3000-pixel-wide portrait comes in around 1.5 to 2.5MB. At 100, it’s often 8MB with no visible improvement on screen. The Convert to sRGB checkbox at export time is the single most common fix for the “why does this look different on their computer” problem.

The Monitor You’re Ignoring Is Lying to You

I run three monitors and I calibrate each of them separately every four weeks using a Datacolor Spyder X Pro, which runs around $170 and takes about ten minutes. Before I started doing this, I was making color decisions based on a monitor that was slowly drifting warmer as it aged. I thought I was correcting for cool skin tones. I was actually chasing a hardware problem with software tools.

If you’re serious about color, calibration is not a nice-to-have. Your corrections are only as accurate as your reference point, and an uncalibrated monitor is a reference point built on a lie.

The single most important thing you can do right now is go to Edit > Color Settings and make sure your working space matches your delivery target. Every technique in this article fails if that foundation is wrong.