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25

RGB is a additive, projected light color system. All colors begin with black "darkness", to which different color "lights" are added to produce visible colors. RGB "maxes" at white, which is the equivalent of having all "lights" on at full brightness (red, green, blue). CMYK is a subtractive, reflected light color system. All colors start with white ...


21

I know this sounds a stupid question, black is black right? Not really. It all depends on colour model used, ambient light, substrate, and perception. Black is, by definition, no light hitting our eyes. This is very difficult to accomplish. :) CMYK is a Subtractive Colour Model. It is used in printing because the mixing of the different pigments of ink ...


15

LAB (aka CIELAB), space is quite useful. It's good for exaggerating color differences, relating colors to color opponent theory. I do a lot of image enhancement and digital art creation from photographs in CIELAB or spaces that resemble it. Its main advantages are separation of color from brightness and roughly evenly spread out color changes - two ...


11

CMYK and RGB are the two colour spaces, methods of creating colour. CMYK is subtractive, like paint/pigment. you start with nothing (white paper) and as you add more colours it eventually turns black. CMYK represents the standard coloured inks that printers use to create colours: cyan, magenta, yellow and black. RGB is additive, the way light creates ...


10

Great question! To take the last part first, your skin hue would be the same no matter the brightness of incident light, provided the color of the light didn't change. That's why "Select skin tones" works in Photoshop CS6 and later. In broadcast video work, there's a commonly-used tool called a vectorscope that will prove to you, if you ever test it out, ...


9

Converting to CMYK won't help you unless you find CMYK specific paint, which I'm not sure exists. Commerical paint manufacturers use a variety of non-standardized ways of expressing colour - so try this web based converter: http://www.easyrgb.com This will convert your RGB to a paint colour. That's the free option. If you want to be really picky, you'll ...


8

RGB is an additive spectrum... you ADD colors to get white. Dkuntz is correct stating that RGB is light-based. It is. It uses the visible light spectrum to display colors. CMYK is a subtractive spectrum... you REMOVE color to get white. DKuntz's use of the term "color-based theory" is really nonsensical. Since RGB is also a color spectrum. A more ...


8

RGB is three dimensional, so to understand the problem it helps to visualise the RGB colour space as a three dimensional shape. A classic way is as a cube based on amounts of the three dimensions, red, green and blue: (images taken from Digital Color Design with the RGB Color Cube: Visualization and Color Coordination Activities, a journal article I ...


8

Yes and no. Yes: It offers a smaller range of colors assuming that integers are required for each value. Photoshop, for example, requires HSB values to be integer and will yell at you if you try otherwise: However, your math seems to be off. You're on the right track with RGB: each value can be an integer from 0-255, so the RGB gamut consists of 256³ or ...


8

As per thebodzio's answer, there's plenty of ways to get that colour. No matter what browser you use there will be some sort of colour picker add-on you can get. Alternatively you could take a screen shot and open it in photoshop. Another way is to open developer tools and look at the sites stylesheet, in chrome you could right click the background and hit ...


7

The easiest way would be to create a selection around the bar code (I assume it's got the white background), then using the Channels Panel - Hightlight the black channel and use Levels to boost the tone to 100%. Then Highlight the C channel and fill the selection with white. Then fill the selection on the M and Y channels with white as well. Double check ...


7

Both Illustrator and Photoshop use hexadecimal values! The screenshot below: Illustrator is on the left, photoshop is on the right You can use either RGB or hexa between the two programs. To transfer simply select your swatch and open the Color Picker and select the hexadecimal value. Fun fact: The first two letters/numbers of hexadecimal value colors ...


7

It's actually far simpler than it may first appear. The bottom line is that it's best to convert to the most native format as early as possible. Full colour printing typically uses four inks to create a photorealistic image. In theory, cyan, magenta and yellow should be enough to print a high quality image, but adding black aids the printing process, giving ...


7

HSV (also called HSB) is based on the RGB system - it's actually just a transformation of the RGB color space (so it's still additive, and is intended for computer displays). The three components of this color system are: H: Hue. This is the angle on the color wheel. Starting with red at 0 degrees. S: Saturation. This is the ammout of 'color' in the color. ...


7

No, you aren't missing something. There is no point at all in converting images to CMYK, and several good reasons NOT to. Converting images to flattened CMYK tiff is an old QuarkXpress workflow that is a complete waste of time today, especially with InDesign. What is a good idea is to size images in Photoshop before final output, to reduce file size and for ...


7

To answer your second question first, Pantone is a color-matching system, like Trumatch or Toyo. It's just a standard so everybody can agree on what "kelly green" is. In Photoshop, click on the Set Foreground Color box in the vertical toolbar. When the Color Picker comes up, click on Color Libraries. In the dropdown menu at the top of the box, you have a ...


7

RGB is a color space that can only exist with projected light. It's physically impossible to replicate it on paper, which is a reflected light color space. So no, no printing press can 'print RGB'. At best, prepress RIP software can convert from RGB to CMYK. In fact, this is what most prepress software workflows do. How they convert to CMYK can vary ...


6

A monitor can't show true CMYK. CMYK is reflective light, or subtractive color. A computer display is projected light, or additive color. They take up different (albeit overlapping) color spaces. Your software does its best to emulate the CMYK colors converting them to RGB but it simply can't replicate them exactly. "When ever I'm choosing color while ...


6

Firstly, when you change color modes, you should use Photoshop's Edit->Convert to profile function. This will allow you to map the colors to the new profile in the least-obtrusive way. This should prevent the logo or other asset from noticeably changing colors. Secondly, the reason people do print designs in CMYK is precisely because it allows them to work ...


6

The premise of the question is flawed for a few reasons. A print proof is meant to mimic the final product. The idea is that you view the proof with the expectation that the final product will look exactly like that. That concept doesn't exist on the web. For a number of reasons: There is no defined canvas size. Unlike a piece a paper, a web browser can ...


6

Although I never heard the term 'pastel colour space', it looks like you're talking about tints, tones and shades of a hue, in HSB colour space. The term you're looking for is shade. The pure hue has S(aturation) and B(rightness) each equal to 100%. Adding any amount of white reduces saturation, while keeping the brightness at 100%, yielding a tint of the ...


6

RGB color is for light-producing situations, and is additive, which means that you are adding light of one color to light of another color, resulting in more light and a mixed color. CMYK color is for light-absorbing situations, and is subtractive, which means that you are absorbing light instead of reflecting it, and mixing two pigments results in ...


6

RGB is an additive color model using light directly from its source before it is reflected off of an object. In essence, you start in darkness and because you are directly viewing the light source, the wavelengths can be added to each other to create colors. CMYK and 'real life colors' both use a subtractive method to display color. In essence, you begin ...


5

I suspect this came about by working in RGB to start with, then converting to CMYK. This would turn your RGB(0,0,0) text into a colour composed of all four CMYK channels, rather than pure 100% K. As Marc and Scott say, body text should be 100% K. (If you did need a stronger black, you's be better of going for a double hit of the black plate rather than ...


5

Generally speaking, once you have "lost color accuracy" by converting to a smaller gamut, there really isn't any good way to do the reverse and increase your color accuracy by converting to a larger gamut. This is generally why I'm part of the camp that advocates working in the largest gamut you can (even if your screen can't display all the colors), as you ...


5

You don't say what the end product is supposed to be, so I can only give with limited advice. To find specific Pantone colors as RGB swatches, use this page on the Pantone website. Since you have the RGB values already, you could also just type them into the color picker of the gimp (or equivalent). To get tints, follow Lauren's suggestion, starting with ...


5

Not to detract from Marc's excellent and comprehensive answer, there are some points that are worth a bit more explanation. It's a big subject. This gets geeky before it gets better, so bear with me and follow closely. :) CMYK and RGB are "color models," not color profiles. A color model is a way to represent colors using numbers. There are other models, ...


5

Real color is a quite complex subject. In essence color is something that happens somewhere between your cornea and brain. Simplifying this a bit color is what you sense when some photons interact with the three color sensing structures in your eye. Other definitions exist but they fail on many levels. Photons can reach your eye trough many processes. They ...


4

There is no substitute for an actual Pantone swatchbook if you are a) specifying color for a project and want to know accurately how it will print, or b) if you're putting together a color board for presentation to a client. There is no on-screen rendering that will show all PMS colors 100% accurately, or even some parts of the CMYK gamut -- the color gamuts ...


4

Photoshop handles the RGB ⇒ CMYK conversion according to the colour profiles you've set. What Photoshop suggests for you here is a variation of rich black. As the name implies, rich black looks richer when printed since it produces more layers of ink instead of just one layer of black (K) ink. You can tune the conversion in Edit → Convert to profile → ...



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