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Classic Color Meter

Classic Color Meter is a enhanced replacement for Apple's Digital Color Meter application. Itrestores functionality available in previous versions of Digital Color Meterand adds many additional features.

Profiles are color corrections in a sense, they make sure that the color you capture with your camera is what you see on screen and is what you see on your printer and in your scanner. They calibrate all your equipment so that consistent colors are obtained. The generally accepted 'standard' in the world of photography is usually the Adobe RGB. In the Preview app on your Mac, open the image you want to adjust. Do one of the following: Apply a color profile to the image: Choose Tools Assign Profile, select a color profile, then click OK. See what an image would look like on a different device: Choose View Soft Proof with Profile, then select a color profile. That is why the best profile for the display is a custom one. You have to tell the system exactly what the display is showing. LR provides sRGB as an option for exporting. But internally, Lightroom is not using sRGB but a larger color space. There is a common misconception that all profiles should be the same.

Download Classic Color Meter on the Mac App Store.

Hold, Tweak, & Paste

Classic Color Meter doesn't stop at measuring — it enables you to quickly tweak colors.Need a lighter shade of your website's background fuschia? No problem. Move your cursorover the background, select Hold Color, and crank up the brightness. Copy the color as an HTMLHex Snippet and paste it into your site's markup.

Classic Color Meter can also perform the reverse — copy an HTML or CSS color to clipboardand select Paste Text as Color. This fills the color aperture and enters Hold Color mode.


Display Modes

  • RGB percentage
  • RGB (decimal or hexadecimal)
  • Hue/Saturation/Brightness (HSB)
  • Hue/Saturation/Lightness (HSL)
  • CIE L*a*b*
  • CIE 1931, CIE 1976
  • Tristimulus
  • Y'PbPr, Y'CbCr

Color Output

  • Values as text
  • Pasteboard image
  • Image file
  • NSColor code snippet
  • UIColor code snippet
  • HTML hexadecimal
  • CSS rgb()
  • CSS rgba()


  • Lock cursor position / X axis / Y axis
  • Adjust magnification (1x/2x/4x/8x)
  • Adjust aperture size
  • Show/hide cursor coordinates
  • Update preview continuously
  • Hold Color
  • Adjust held color
  • Paste Text as color


  • Adjust aperture color
  • Assign actions for clicking/dragging the color swatch
  • Use lower-case letters for hex values
  • Include pound sign prefix for hex values
  • Show visual guides when locking cursor position
  • Show component sliders when in Hold Color mode
  • Assign global keyboard shortcuts
  • Move mouse cursor with arrow keys

RGB / HSB / HSL conversions

  • Show as sRGB
  • Show as Display P3
  • Display native values (for advanced users)
  • Show as Adobe RGB
  • Show as ROMM RGB

Frequently Asked Questions

Why do values not match those in my image editor?

Classic Color Meter, like all system-level color meters, only sees the valuesthat macOS sends to the display. These values are in the display'scolor space.As an image editor has access to color information prior to any colorspace conversion, its meter may choose to display this informationas raw values in the image's color space.

For website and application development, it's recommended that you set bothClassic Color Meter and your image editor to the sRGB (or Display P3) color space.

For more information, read my article on macOS Color Meters and Color Space Conversion.

I'm a photographer. How accurate is Classic Color Meter's L*a*b* display?

As mentioned in my article, there are two typesof color conversion issues: clipping errors and rounding errors.

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Clipping errors occur when your computer's display uses a narrower color space than your camera.For example: your camera is capable of Adobe RGB but your monitor is sRGB or Display P3. Usingan Adobe RGB monitor will eliminate (or drastically reduce) these errors.

Rounding errors occur due to limitations in macOS. Specifically, macOS may reduce the color depthto 8-bit even when your photo software and display support higher bit depths.

That said, as long as your display uses an equal or wider color space than your camera, theL*a*b* readout should be reasonably accurate and usable.

What are the “legacy” features that are hidden by default?

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Starting in version 2.0, Classic Color Meter hides certain legacy color spacesand conversions by default. These were used by a small percentage of workflows andmostly fixed quirks in macOS's color management.

To re-enable these options, select “Show legacy color spaces and conversions” fromthe Advanced pane in Preferences.

• RGB, 16-bit

Historically, Apple's Digital Color Meter app offered a '16-bit' option which displayedeach color component as a number between 0 and 65535.

Classic Color Meter added this feature for parity. Unfortunately, users thought thatthe '16-bit' mode was more accurate than the '8-bit' mode. In reality, Apple's screenshotAPI has always returned 8-bit values (even on 10-bit displays).

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• Show as Generic RGB

This option converts colors into the non-standard 'Generic RGB Profile'. As far as I can tell,this color profile was last used in the Mac OS X 10.3 Panther era (released in 2003).

• Convert to main display

Around Mac OS X 10.7, Apple would convert colors on the secondary display to the main display's color space.This option was occasionally useful in that era.

Why do colors in the right view appear less saturated than those on the left?

Newer Macs feature a display with a P3 color space. This provides deeper colors than the sRGB color space.

When Classic Color Meter is set to “Display in sRGB”, the closest sRGB color will be shown on the right.The original screen image is shown on the left. This sRGB color represents what most Macs and iOS devices (which have sRGB displays) would see.

Minimum Requirements

  • macOS 10.13
Ready to buy? Download Classic Color Meter from the Mac App Store
Still have questions? Contact me