So why do we need spot colors? Well, we as humans can see a wide range of colors. Scientists claim we're capable of seeing 10 million shades. And if that sounds like a lot consider that some animals, such as tropical fish and birds, can see colors we can't. And in fact bees can even see into the ultraviolet. Of course, we're not trying to print the ultraviolet, we just like to print the colors that we want to see. But there's a limit to what we can print. Now, this sort of odd shaped rainbow that you see is supposed to represent the range of colors that we can see. Admittedly, you see a limit there that defines what we can see on a monitor, so clearly we're not seeing everything that we can see. But this is really just to give you an idea of what the capabilities are. The monitor gamut is reasonably big, the CMYK gamut is pretty much smaller, although you'll notice that there are some parts of the CMYK gamut that actually fall outside the monitor gamut.
Colors like cyan, you really can't render faithfully on a monitor, you can come close, but you can't quite hit it. And then of course, we have the PANTONE gamut which is wider than what we can see in either other reality, the CMYK or the monitor. And, I'm using PANTONE here but there are other spot color systems. But the concept is the same. These are specially mixed inks that let us accomplish stuff in print that we couldn't with a combination of CMYK. Now CMYK is adequate for photographic reproduction for the most part but there are a lot of colors that we really like that we can't print within that gamut. Now there are some colors that you could print equally well using spot colors or using CMYK.
For example, and I just pulled this at random. PMS 235, you can approximate very closely with CMYK. But then when you come across colors like bright oranges or navy blues, you're going to find that you really can't print those satisfactorily with combinations of the process inks. And we tend to like those bright colors, and if you want to image those bright colors, you're going to have to use a spot color. And navy blue, very common problem. Think how many logos you know of that use navy blue. That always goes kind of grey, a little bit purple.
You really can't do it with CMYK. If you want navy blue, you're going to have to use a spot color. And then, of course, if you want to print something like a metallic ink. Or fluorescents, or neons, you can't even come close in CMYK. So, that's why we need spot colors. We need to be able to create a special ink that accomplishes a color that we have our heart set on, that we cannot approximate with CMYK.
- Why spot colors are necessary
- Making a decision between spot and process colors
- Choosing a spot color
- Understanding the effects of stock on color
- Printing spot colors digitally
- Using varnishes
- Creating a multi-tone image in Photoshop
- Adding Pantone color swatches to Illustrator
- Creating spot varnishes in Photoshop, Illustrator, and InDesign
- Using preflight profiles in Acrobat