Serene Life

by garik

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22

sRGB is the most common color-space used anywhere. AdobeRGB is a wider color-space which can represent more colors but with less precision when looking at the colors which overlap sRGB. Neither color-space really matters when shooting RAW. The embedded thumbnail or preview within a RAW file may be affected by the choice of color-space though, so keeping ...


15

Color spaces, as ysap stated, can be a confusing issue. There isn't a single correct answer to this question, and what you intend to do with the "final copies" of your images will really dictate what color spaces you use and when you convert from one to the other. While I think it is getting a bit dated, sRGB is still the "safest" color space these days. ...


15

I'm not quite sure what you're asking, but I'll try and cover all the bases. Firstly RGB values run from 0 to some arbitrary number depending on the colour depth - how many different colours your image format or editing program can store. A typical colour depth is 8bit per channel. Here the number of red, green and blue values is two to the power of 8, ...


14

The answer is basically the same as this one on white balance and raw. You're right, it doesn't matter at all in how the image is recorded or stored. As you note, the selected color space applies to the preview image and to the histogram. The camera also may make metering decisions intended to avoid clipping (overexposing to the full saturation point) in ...


14

To start simply, the answer is "It is used for still photography!" I'll explain a little more in a bit, and its use is fairly niche at the moment. The roots of xvYCC The xvYCC encoding is, as far as I can tell, a modern enhancement to YCC encoding, or in its long form, Y'CbCr (or YCbCr, which is slightly different.) The YCC encoding is part of a family of ...


10

sRGB is the default color space, which is way that RGB values translate to actual colors. In RGB, (255,0,0) means "full red", but what exact color is this going to be usually depends on the display or printer that's used for the output. As this is undesirable for professional purposes, people employ color management to ensure their idea of "red" will display ...


10

It's just the values from the sensor, which is a (mostly) linear counter. The different photosites on a Bayer sensor have different colored filters, and the value for each site represents the light which gets through that filter. The name "RAW" is meant to convey precisely that the values are simply that "uncooked" reading. In a sense, then, the RAW file is ...


10

Bit depth and color space are not the same thing, and neither are they mutually exclusive. They are different things that exist simultaneously. For a particularly simple explanation: Bit depth determines the fineness with which each distinct color is graded. Color space determines the extent within which those colors are distributed. Let's take sRGB and ...


9

Basically, life color information is like a box of chocolates crayons... Color information is stored in integers, not analog values — there are a discrete, countable number of colors that can be described at a certain bit depth. Think of the color space like a box of crayons of different colors. A color space describes the types of crayons that are ...


8

It is normally the responsibility of the viewing software to convert from the color-space of the file to that of the display. From what I understand, you want to do the conversion yourself because you use programs that simply assume sRGB as a color-space. A lossless conversion is not possible for this. On a properly calibrated system you will also make ...


7

If everything is working correctly, the difference should be subtle and you shouldn't generally notice a big shift. I have a suspicion: You may be working on a monitor which is not capable of rendering the whole Adobe RGB gamut. In this case, out-of-gamut colors are clipped or approximated (perhaps poorly). When you convert to sRGB, the colors are mapped ...


7

A color model is the mathematical (or computer science) way of describing colors. It is independent from physical devices. RGB-8 or RGB-16 are color models as well as CYMK or HSL. A color space is the method of mapping real colors to the color model's discrete values. sRGB and AdobRGB are color spaces that both use RGB as model. But in one the color ...


6

Normally you would use sRGB mode. It is the most common denominator. Keep in mind that this mode is not calibrated, so your sRGB colors will be different from other sRGB colors. They should be closer. Once in sRGB mode your monitor may not be able to show colors which are outside of sRGB color-space which is why sRGB is not the default mode. The truly odd ...


6

Yes and no. It is important to remember that RGB is an additive process, and CYMK is a subtractive process. First, the yes; there are general mappings that can be done -- so the absence of green light means that you want to print magenta (which will reflect the red and blue portions). On a slightly more detailed level, you get the "no"; There is more than ...


6

Photopic luminous efficiency is more simply stated as the spectral response function, normally of the human eye (though in photography it could also refer to spectral response of film, sensor, etc.) There are several -- in fact, if you want to get down to it, there really millions -- every person's spectral response is probably (minutely) different from ...


5

xvYCC is a particular clever way of encoding color data: it abuses the YCC representation by using previously-forbidden combinations of values to represent colors outside the gamut of the RGB space used in the YCC scheme. That is, some YCC tuples decode to colors with negative R G or B values. Previously these were simply illegal; in xvYCC these are ...


5

I'd say that it depends on your output medium, or more correctly, the relationship between the object, the storage format and the output medium. The problem is that when working with an extended space, then at the last stage of actually printing or displaying your image, where the medium is more limited than the source, some kind of remapping needs to take ...


5

A color model is a method of describing a color. For example with Red, Green and Blue (RGB) elements or with Cyan, Magenta, Yellow and Black (CMYK). A color space is the set of colors which can be displayed or reproduced in a medium (whether stored, printed or displayed). For example, sRGB is a particular set of intensities for red, green and blue and ...


5

Because, as you say, L*a*b* is a superset larger than either sRGB or Adobe RGB, you're right, this is safe — if you have enough bit depth to prevent color mapping errors. In practice, this means that if you are working in 16 bits per channel, there is no loss. If you are working in 8 bits per channel, there may be some, as you are spreading your "crayons" ...


5

1) I have never seen any official information, but various people close to the LR development team indicated at numerous occasions that LR is internally using color space that they named Melissa, which has gamut of ProPhoto RGB, but different gamma. 2) No devices support entire ProPhoto RGB, but many, especially modern inkjet printers, exceed sRGB and even ...


4

Color spaces solve two problems related to color information: imaging sensors can capture a lot more data than can be displayed by any media or device - the data is therefore useless when transferring and storing images; color space defines the range of data that is preserved color space standardizes what each color should look like, so the ...


4

It does not matter what you set in your camera if you shoot raw. (What matters is how you configure the software that you use for raw conversion.)


4

The main difference I see is that they're saved with different JPEG quality parameters - the smaller file has quality 91 (according to GIMP), whereas the larger file has quality 99. File size can grow pretty exponentially at high quality parameters. Resaving the larger file at quality 91 reduces it to around 2.2 Mb, which while still significantly bigger ...


4

The only advantages to saving your RAW files as 8-bit is for memory conservation or if certain tools only work with 8-bit images. There is no advantage from a quality point of view, if you're going to do a lot of editing especially in a wide colour space then you may get posterisation when working with only 8 bits. Regarding colour spaces, it is advisable ...


4

CMYK CMYK is a subtractive colour model rather than an additive as in the case of sRGB. The subtractive colour models are used in printing since they allow dyes, ink or paint pigments to absorb certain wavelengths from an otherwise white surface. The dyes, ink and paint pigments can be a very limited discrete set that are mixed to get a wide range of ...


3

sRGB is best for images view on screen, Adobe RGB is best for printing. These are color spaces, which affect the rendering of an image on the mediums. I found that sRGB will give you the most consistent result for screens. NB! No screens will ever give you the exact same result (even if they have been calibrated) color management can be quite complex to ...


3

Good explanations of additive versus subtractive color so far, I just wanted to clarify a few points... First, there isn't a single RGB or CMYK standard, both are device dependent (the colors vary based on what device is displaying/printing them), so already we have trouble. A typical CMYK color space (a graph of all the possible colors of a given color ...


3

So, to answer my own question a bit after some research: While it isn't xvYCC, for reasons that really still elude me (since JPEG encoding uses a similar older scheme), there does appear to be some encouraging moves on the "we can have nice things!" front, because it appears that at least Microsoft cares about wider color gamut and better bit-depth in still ...



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