How to compare a photo color with a website theme

A color in your photo looks close to a website’s theme, but you are not sure if it really matches. You can compare the colors by sampling them on screen and checking their HEX, RGB, and HSL values.

The Color Picker can pick a color from anywhere on your screen. Use it to check a representative area of the photo, then the website color you want to compare. The anywhere-on-screen feature works in Chrome and Edge on a computer. Other browsers may offer reduced support or none.

Compare the colors

1. Open the Color Picker in Chrome or Edge on a computer. Keep the photo and the website visible or easy to switch between.
2. Show the photo large enough to identify a clean, representative area. Avoid edges, reflections, shadows, and textured spots if you want to compare a single color rather than the way light changes across the image.
3. Pick a point inside that area with the Color Picker. Note the HEX value, such as #3A7F91, or the RGB values. If the photo has several shades, sample more than one point and note which area each value came from.
4. Switch to the website and pick the theme color in its normal state. For a button, sample its background, not the text or a border. If you already know the theme’s HEX value from a style guide, compare that value instead of sampling the page.
5. Compare the two sets of values. Matching HEX values mean the sampled screen colors are the same. If they differ, compare the RGB channels and check whether the difference is in hue, saturation, or lightness.

Write the values down as you go. If you sample several parts of a photo, a short note like “blue jacket, shaded side” helps you remember which color you actually compared.

What the comparison means

The HEX values match

The two sampled colors have the same digital value. This is a strong match for those exact pixels, but it does not guarantee that the photo and website will look identical in every context. A photograph can contain texture, lighting, and nearby colors that change how a color seems to your eye.

The values are close, but not identical

Look at the RGB values, where each red, green, and blue channel runs from 0 to 255. A small difference in one channel may be hard to notice, while changes across several channels can make the colors look noticeably different. In HSL, hue describes the basic color, saturation how vivid it is, and lightness how bright it is. Similar hues with different lightness can still feel like a poor match.

There is no universal number that makes two colors “close enough.” A photo color may need to be a little darker or less saturated to work as a website background, especially if the website also uses text on top of it.

The values are very different

Check that you sampled the intended parts of the image and page. You may have picked a shadow, border, antialiased edge, hover state, or a translucent color blended with another background. If the website uses a gradient, different points along it will have different values.

How to make the comparison more reliable

1. Choose a flat part of the photo. Pick an area with even color, away from edges and strong highlights. A single point sample cannot represent a whole object if its color changes with lighting or texture.
2. Sample the website’s normal state. Move the pointer away from buttons and links before sampling if hovering changes their color. Check that you are comparing the theme color itself, not a shadow, border, or text color.
3. Keep the display conditions consistent. View both colors on the same screen when possible, and avoid comparing a photo on one device with a website on another. Different displays can show the same digital values differently.
4. Check display color settings if the colors look wrong. On Windows 11, open Settings › System › Display and check whether Night light or HDR is changing the appearance. On a Mac, open System Settings › Displays and check Night Shift and True Tone, if available. These features can change how the screen looks to you, even when the sampled values match.
5. Look for transparency or overlays. A theme color with transparency is blended with the background beneath it, so the visible page color may not equal the theme’s base HEX value. Compare the rendered color on the page, or find the underlying value in the site’s theme settings if you need to match the design token itself.

For a quick visual check, place the photo and the website color side by side on the same display, then use the sampled values to explain what your eyes are seeing.