Hot answers tagged rgb
19
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 ...
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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 ...
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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 ...
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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 ...
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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 ...
6
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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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 ...
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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 ...
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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 ...
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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It is a misnomer, or at least confusing, to say both: "RGB is based on light and it's additive because you start with no light" and "CMYK is based on ink and it's subtractive because you start with no ink".
It is easy to understand how RGB works, as the usual displays create colors by adding the additive primaries, red, green and blue, together in ...
4
Your original question has been adequately answered, but since you're a photographer, it's important to recognize that there are different RGB color spaces.
The three you'll most often come across in photography are "ProPhoto RGB", "Adobe RGB" and "sRGB". They all measure color using the RGB model (amounts of Red, Green and Blue light), but differ in their ...
4
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 ...
4
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 ...
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The range of colors that can be reproduced in any CMYK-only color (known in the trade as "Process Color") printing method is considerably smaller than the sRGB range of colors reproducible on a standard monitor. Here is an excellent video that demonstrates this visually using 3D color models.
It happens that one of the ranges of RGB color that can't be ...
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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 ...
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It's not so much "how does the monitor display color" as "how does the software think it's displaying this particular color on this particular monitor." As they say on Facebook, "It's complicated."
Color gets to your screen through layers of software called color profiles. A color profile takes the raw numbers and interprets them for display or for ...
4
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, ...
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You don't need to work in CMYK directly. Stay in RGB as long as you want. When you're ready to send to the printer, save your original, then Save As PDF/X-1a using [filename]_CMYK.pdf or something similar, which will convert to CMYK on the fly. Use as your output color profile in the PDF dialog the one that your printer recommends. (ALWAYS ask your printer.)
...
3
RGB is an additive color space. If you mix the three base colors (red, green and blue) you get white. That is the model monitors use, if the red light and the green light and the blue light is mixed, it becomes white.
CMY (cyan, magenta and yellow) are suubtractive. If you mix all, you get black. That model is used by printers. If on a dot are printed all ...
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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 ...
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You might need to redo the "color management" on your computer. I ran into this a couple years ago at work, I could save a small picture to the desktop and open it, take a screen shot of it and paste it into photoshop and the colors would be different!! I don't work there anymore so I don't have the exact settings, but I remember where I changed the ...
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There is no such thing as a definitive conversion from a PMS colour to RGB, so if the client hasn't already determined what RGB value to use, and there isn't any previous web work to form a precedent, I'd recommend that you provide a few on-screen samples and get them to choose what they think is best by comparing with a Pantone swatch at their desks.
...
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Are you using the Pantone color as a reference to use it on the web or for print?
The only way to see colors accurately is to use a correctly calibrated monitor setup using the correct profiles in your software program. Even then it best it will be an approximation. One problem is that the Pantone system is subtractive and a monitor is additive, they have ...
2
To get an approximation to the RGB of the tint value, you need a bit of arithmetic:
If the RGB of your Pantone colour is (0, 101, 96)
and the background is pure white, i.e. (255,255,255)
then a 50% tint is pretty much halfway between the two - and that calculation is done for each of R,G,B separately. And the answer is: R=127, G=178, B=176 . That's because ...
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The Catch 22 here is that anything soft, like a PDF, will show you a color on your screen, but you've no way of knowing whether what you print from it will accurately show what "real" CMYK off a press will look like. To make things worse, the appearance of printed on uncoated paper is different from the exact same ink (or combinations of inks) printed on ...
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