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25

Check out this image by Jeff Schewe from wikipedia. It's a 2D slice of what's really a three-dimensional space, but it makes the basic concept clear: So: sRGB is a subset of AdobeRGB, which is a subset of ProPhoto RGB. You can also see how ProPhoto RGB extends outside of the curved shape which represents visible colors. And you can see how AdobeRGB is a ...


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

I expect you are looking at the exported JPEG photos with some program which does not properly take the color space into account — it just assumes sRGB, the standard default. So, only your photos exported to match that expectation work. (Even if your screen is calibrated, your applications might not be so smart.) Keep in mind that Adobe RGB is a color space ...


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. ...


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

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

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 ...


8

I don't know of any statistics that I can back this up with, but I feel like a very high majority (I'd guess at least 99%) of images on the web are going to be in sRGB. The primary reason for this is historically most browsers have not been color managed (you can test yours here), and default to treating all images as sRGB, and further, many web services ...


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

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

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 ...


4

I haven't done the math, but I believe there is a lossless RGB to CMYK transform, just as there is from RGB to Lab or RGB to HSL and back. I believe you just want to ignore the black channel, and reflect the R, G, and B channels across the color cube. The thing is, in what way would that be useful? No one makes CMYK images with the intent of showing them on ...


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

I don't think the number of users uploading non-sRGB photos is going to help you too much with analysis, as I suspect the bulk of users are uploading from point and shoots onto Flickr, etc. What you should investigate is how many of your users, coming to your site, are using color managed browsers. Safari on Mac and Windows are color managed, as is ...


4

First of all, sRGB is a single color space, with defined boundaries and defined mappings from RGB values to (for example) CIE XYZ values, a specified viewing environment, etc. CYMK, by contrast, is really a whole family of color spaces. All the color spaces in the family are subtractive, but you can't count on them having a lot in common beyond that. The ...


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

If you have a Mac, you can visualize differences between color spaces in 3D - run ColorSync Utility, and select a large color space (like ProPhotoRGB or AdobeRGB). Then click on the arrow at the upper left corner of the plot, and select "hold for comparison". Then select a different space to see it plotted on top of the other one, you can rotate all ...


4

To add to @mattdm's great answer - but unless I missed it, there is no explanation to the file size - I would speculate that when shooting aRGB and then transforming to sRGB with an intent that saturates the overflowed color (relative colorimetric), then since in the range of the aRGB gamut that is not transformed (not clipped) there are less discrete color ...


4

Actually, #E58C4E, if you mean the web color, is defined to be in sRGB. However, if you didn't mean that particular convention but rather "red:229, green:140, blue:78", it's a different matter, because the extremes (the "primaries") of each channel are different in different color spaces, so those numbers actually do represent something different in each ...


4

The real key is going to be that you'll want true 8 bit color resolution rather than the 6 bits that most TN panels get. Off angle color changes is also a key issue when looking at choosing a good screen for any color sensitive work. Having a wider color gamut is helpful, but if I had to choose between a more limited color gamut on a S-IPS panel with good ...


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

[afaik] Unless the display driver or application being used applies a color profile or similar to compensate for the wider gamut, the color codes you use in your application will be sent to the display as-is. And in the display a specific color value (say E5) is no longer interpreted in the srgb scale but in the wider gamut scale. So why does the display ...


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

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

Yellow is not a native color of the monitor. The screen is composed of red, green and blue sub-pixels. If red, green and blue all look fine, then something else is going on with the yellow. There is a good possibility that this is a physical limitation of the screen's color gamut, since you said that full red and full green look the same, but full red and ...


3

The covered range of colors (called gamut) is different between color spaces because these ranges are then discretized, "digitized", represented on a fixed amount of bits, and then reproduced on a monitor, in print, etc. One wants to store as much color information as possible in a certain amount of bytes. Now, if you have an equipment which can only emit ...


3

CMYK is based off of offset printing capabilities where you are using only specific shades of Cyan, Magenta, Yellow and Black ink being laid down from separate printing plates to print full color. It isn't mechanically capable of reproducing very saturated colors. But ... most photo inkjets don't expect you to send generic CMYK files to them. They have ...



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