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Supposing that I have the following table,

enter image description here

Is there a fast method (with external tools with the web: for example ColorZilla, browser extension) to recognize the color in RGB (or CMYK) without to install any software?

For me it is important to know because I use LaTeX for my important document.

Which software supports the function of identifying the color used in a given image?

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    Maybe this isn't for you, but on Mac I'd recommend ColorSnapper or Sip. They are essentially OS wide color pickers. — I like Color Snapper, because it has this zoom toggle, which zooms in really close when you hold down Ctrl. It's way nicer than increasing and decreasing the zoom level using 2 different shortcuts, which is what you gotta do in Sip. Sip recently had a big update, so maybe they added that. Who knows... I don't. – Joonas Feb 18 at 13:15
  • @Joonas Very good. Can you delete your comment and give me a complete answer adding also the screenshots? I like give all user also a vote. – Sebastiano Feb 18 at 21:50
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    I didn't think it fit here mainly cause you didn't want to install any applications, but I guess it can still help other people. I'll post it as an answer, but I'll have to do it tomorrow. – Joonas Feb 18 at 21:58
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Make a search for Color Picker. You find several tools like this:

enter image description here

It's here: https://imagecolorpicker.com/en

If you can run legacy Photoshop, you can as well do PrntScrn to copy an image to the clipboard, then open a new image in PS, paste and check the colors with the picker.

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If image is in web browser, it is rendered as RGB, so basic color pickup will work. Use Colorzilla or any other color pickup tool (browser based or local installation doesn't matter). CMYK image have no use of values without knowledge what color profile is used, so no simple solution is possible. Mozilla have several Color Management solutions built in in testing versions, but they are still experimental, so I would never rely on them.

  • Meanwhile I thank you and in the same way as I work in TeX.SE. I always vote in favor of any answer I am given, as it is correct on my part, consider the time taken by a user to provide an answer. Do you know any other color pickup tools? I currently have an old pc and would not like to create problems. Thank you. – Sebastiano Feb 17 at 12:37
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I got 2 application suggestions for Mac:

They are OS wide color pickers so they can be used to pick colors from practically anything. I like Color Snapper, because it has this zoom toggle, which zooms in really close when you hold down Ctrl. It's way nicer than increasing and decreasing the zoom level using 2 or 4 different shortcuts, which is what you gotta do in Sip. Both applications have these shortcuts that adjust the magnifying glass size up or down and zoom level up or down.

The toggle feature in Color Snapper is really handy because it's easier to move around when you're not super zoomed in and then zoom in when you are over the area where you want to pick a color by using just a single modifier key. If you want to do the same thing using these shortcuts, it's a big hassle. That's always been the big selling point for me. That said, Sip does have some more features.

I do also like that with Color Snapper you pick the color and then it suggests the different output formats, whereas with Sip, you gotta choose the format first and then pick the color. It's not a big deal though... If you pick a color in the wrong format, you can change the format and copy the color to your clipboard again from the color history.

Sip does give you CMYK, while Color Snapper doesn't. They both have trials.

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