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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 ...


13

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 ...


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 ...


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 ...


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 ...


5

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 ...


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 ...


4

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 ...


4

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 ...


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

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 ...


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 ...


3

You have things almost completely backwards. This is not a case where still photography could/should "catch up" with video -- quite the contrary, this is a matter of video having finally caught up to (roughly) the capabilities that TIFF (for one example) provide a couple decades ago (or so). While you certainly didn't see very many 16 bits/channel TIFFs 20 ...


3

Short Answer You should not actually convert your images directly into the printer space, as you then actually lose the ability to properly color manage your results. For color management to work, each device involved in the process needs to be assigned a color profile. The image should be assigned an appropriate color space itself, and that is usually ...


2

I'll add a couple of notes around Jon's... The color space is meaningful in a camera context only when talking about JPEGs because, for Raw images, the color space is a choice in the "development" phase. Some cameras (Pentax semi-pros for certain) allow the choice of sRGB or aRGB for the JPEG development, so perhaps they may add a third (or fourth for ...


2

So, sRGB IEC61966-2.1 is the standard sRGB color profile and the one that you want to be using. My understanding is that Camera RGB Profile happens on iPhoto import when the color profile isn't present in the image during the import. Other than the gamma (sRGB is 2.2, this is 1.8), the profiles are identical, but that a lot of devices and computers won't ...


2

No, you should never use your monitor profile as "working space". Monitor profile serves a completely different purpose. Your working color space should not be tied to any device at all. It should be set to some abstract device-independent color space that has sufficient coverage and precision to minimize data loss (caused by integer overflow and/or ...


2

You need to interpret those exposure warnings as this: "If you export an LDR image with the current settings, these are the areas where you have lost detail that exists in the original unedited picture". This is very useful, because you can move sliders and immediately see the effect your change will have in a final exported LDR image. Also note that ...


2

From "Color Management: Understanding and Using ICC Profiles", edited by Phil Green : Color image encoding: digital encoding of the color values for a digital image (Derived from: ISO 12231) Color space: geometric representation of colors in space [...] (CIE) Color space encoding: digital encoding of a color space, including the specification of a digital ...


2

You use color references to create an ICC color profile for the specific lighting conditions and camera settings, then take shots and the color information contained in the pictures plus the ICC profile provides you with the proper color information. Check out some of the color targets through this link. I personally use the ColorChecker Passport. Make ...


1

It is very likely that your monitor cannot support the full AdobeRGB gamut. The best way to convert an image from one color space to another with minimum changes in color reproduction is by following the below process: Having set your workflow's color management to AdobeRGB (Photoshop, Lightroom, etc) Having your monitor profile set in AdobeRGB as well ...



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