![]() Take a look at the image on two different displays, or on your phone or tablet, and you’ll see differences, ranging from very slight, to quite drastic, depending on the device. That’s why there are some crunchy gradations in the chart, and those nasty steps in the gradations will change depending on the device on which you look at the image. This chart (below) contains way more colors than our displays or printers have the ability to reproduce. To illustrate the issues we face I created a Granger Chart in Photoshop following the steps in this Luminous Landscape article. We need to edit with more wiggle room than we need, and then adjust this to the output device when necessary. You might think that’s strange, but this is the same theory as my reason for recommending that people work in ProPhoto RGB. They understand many more colors that they can display or print. These days, our computers understand millions of colors. The core piece of information that we need to keep in mind is that every device capable of displaying an image has limitations on what colors it can display. Let’s take a look at the problems we are trying to overcome in a little more detail. On a very basic level, this is what an ICC profile does, but for millions of colors, not just one. We’d both understand what red is and be able to visualize the color. However, if we had a dictionary to map the color red to the Japanese word “akai” we could communicate. Likewise, assuming I didn’t understand Japanese if a Japanese person said the word “akai” to me, I would not understand them either, and not be able to process that information. Now, of course, you’d be hard pushed to find a Japanese person that doesn’t understand the word “red” in English, but assuming they don’t, when I say “red” to a Japanese person, they would not know how to process that information. For example, I understand the color red, and the word “red” to describe that color. If one person only speaks English, and another only understands Japanese, they have no way to communicate. Now, of course, you’d be hard pushed to find a Japanese person that doesn’t understand the word “red” but assuming they don’t, when I say “red” to a Japanese person, they would not know how to process that information.Īnother way to think of this is the difference between human languages. Another way to think of this is the difference between human languages. ICC profiles are used to translate the colors in our image to the ones reproducible by any given device or output media. So, the first thing to remember is that the ability to reproduce color varies depending on the device or media on which we display or output our images. ProPhoto RGB is a much wider profile, larger than all of the other devices and media profiles that we might use, and this is why I recommend using it when editing our images, but you don’t need to use this for your display, or when actually printing, as these modes of outputting our images have their own limitations, and it’s these very limitations that make ICC profiles necessary in the first place. If you recall from the video, I showed you the ICC profiles for my two computer screens, and these were very different from my camera Profile, and my various print media profiles. You may recall from the video I released a few weeks ago, that I talked about using ProPhoto RGB whenever possible, and some people asked if they should use this for their computer display. Following the release of my video on soft-proofing, I received a few questions that helped me to realize that I need to spend a little time going over the reasons that we even need to use ICC profiles, and what they actually do.
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