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by evan-pak

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A colour space is a specific organization of colours. In combination with physical device profiling, it allows for reproducible representations of colour, in both analogue and digital representations. The colour spaces most commonly encountered in photography are Adobe RGB and sRGB.

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32
votes
8answers
13k views

What's the difference between Adobe RGB and sRGB and which should I set in my camera?

In my Canon 60D, there's a setting between Adobe RGB and sRGB. What's the difference and what should I prefer when shooting to RAW ?
22
votes
3answers
11k views

Does the selection of sRGB or Adobe RGB in camera when shooting RAW ever matter?

I shoot RAW essentially 100% of the time, and have the in-camera color space setting at AdobeRGB (sRGB is also offered). The raw converter in turn is set to produce sRGB output files. As I understand ...
18
votes
5answers
2k views

Why isn't the xvYCC color space seeing uptake for still photography?

For the last fifteen years, sRGB has been the primary standard for computer monitors (and for consumer-level printing). That's changing now, as wider-gamut LED-backlit monitors become common. Usually, ...
17
votes
3answers
907 views

How much of a difference do different color spaces make?

How much of a difference does it make to use one of the extended colorspaces vs. the normal sRGB? And what difference does it make? Are there situations where it is not important, and conversely are ...
16
votes
7answers
2k views

Why don't color spaces use up the entire color spectrum?

Take a look at the CIE 1931 chromaticity diagram shown with the sRGB color space gamut. Why are certain colors intentionally left out of color spaces, like you see below? Why not just include all the ...
16
votes
4answers
3k views

Are RGB numeric values equal to CMYK percentages?

are RGB numeric values equal to CMYK percentages?
14
votes
2answers
41k views

Should I use “sRGB mode” on my computer screen?

I recently acquired the ASUS PA248Q screen for photo processing (and everyday use and gaming: I have just that one display). This display offers a "sRGB" mode. Right now the screen is configured to ...
9
votes
5answers
5k views

What's the difference between colour space and bit depth?

I know that there are different types of colour space and that sRGB is the most common. Bit depth defines the variations of a colour channel, where (I think) 8 and/or 16 bits are the most common. ...
8
votes
1answer
392 views

Why does L*=0 not correspond to black in the L*a*b* color space?

According to two sources I found, in the CIELAB LAB colorspace a value of L*=0 corresponds to black. Quoting Wikipedia: The three coordinates of CIELAB represent the lightness of the color (L* = 0 ...
7
votes
7answers
233 views

What is the actual color space of film in film photography?

I have been thinking about this question for a while now, and I haven't found an answer online. Modern technology (scanners, screens, digital cameras, printers...) use technical color spaces to ...
7
votes
4answers
1k views

What is the difference or relation between a Color Model and a Color Space?

What is the exact relation or difference between a color model and a color space? I find these two terms to be used interchangeably in some literature. Are they simply the same? Thanks!
7
votes
1answer
291 views

Is it true that all current browsers and OSes are “color managed” now?

My understanding is that around 2010 everything except IE (which still had issues) was Color Managed and displayed web images containing embedded profiles correctly. Today (2015) all current ...
5
votes
2answers
15k views

Adobe RGB to sRGB conversion, why does the color change?

When I convert my photos from Adobe RGB colorspace to sRGB for browsers, the color slightly changes and I’m bothered by it. I know that sRGB covers a smaller space of colors so I won’t get an exact ...
5
votes
3answers
3k views

Losslessly batch convert many JPEGs to sRGB?

Recently I came across a bunch of weird JPEGs; here's one of them. In Firefox 16.0.2 and ACDSee it looks much more vibrant: However in Internet Explorer 9/MS Paint/Paint.NET 3.5.10 (on Windows 7 ...
5
votes
3answers
267 views

Why don't cameras capture using the CIE XYZ color model?

If the CIE XYZ color model is a better representation of what humans see, then why don't CCD arrays in cameras capture data in a way that maps to it rather than the RGB model? It seems especially ...
5
votes
1answer
70 views

How to minimise the noise in colour values when moving between colour spaces?

Let's say I was to change from RGB to HSV using a software like Matlab and then convert the result back to RGB using the same software. I know that there are going to be some slight noise and error in ...
4
votes
7answers
919 views

Is CMYK less blue than sRGB?

When comparing the sRGB and CMYK color spaces, the sRGB color space encompasses much more blue than the CMYK does. Open Photoshop using sRGB as the color space. Fill the entire image with blue (rgb(...
4
votes
1answer
296 views

How is color represented in RAW formats?

I was browsing the forum and found this thread: Does the selection of sRGB or Adobe RGB in camera when shooting RAW ever matter? It makes sense that the selection of either sRGB or Adobe RGB as the ...
4
votes
3answers
469 views

What does the under/overexposure warning mean in image editing software?

We all know exposure warnings that a digital camera offers: If shows which parts are so bright or dark that there's no more distinction towards even brighter or darker areas possible. Meaning that ...
4
votes
3answers
317 views

What are the RGB primaries in a camera?

More generally, what is the nature of the gamut? Primaries as peak sensitivity don't behave the same as primaries for mixing output. I suppose this is necessary to know for RAW importing and would be ...
4
votes
3answers
275 views

What is the advantage of using L*a*b in Photoshop?

In a couple posts, I noticed throw-away remarks about using Lab as the recommended or only serious thing to do. Why?
4
votes
4answers
219 views

How to calibrate colors from photos for classification purpose (ICC profile)?

For a scientific study, I have to classify pictures of crop canopy in two classes: vegetation / soil. These picture are taken at several places, different times and date. The idea is to use the same ...
4
votes
2answers
125 views

What's the perfectionist's workflow for taking a photograph from capture to print?

I'm interested in perfecting the 100% ideal method of doing things, keeping the color tones and quality through capturing to the printing and publishing. This isn't about handling the camera or doing ...
4
votes
1answer
466 views

Understanding Hue, and is there something else I should be using?

I am trying to isolate objects of a certain color in an image. Looking at this image, you can see that I have extracted the hue channel, and have filtered these values so that the closer a pixel's hue ...
4
votes
1answer
664 views

What is the native color gamut of a modern digital sensor?

What is the area of CIE 1931 diagram that is being covered by contemporary digital camera sensors? I can find triangles for LCD panels being comapred to sRGB and aRGB and ProPhoto. There are always ...
4
votes
3answers
629 views

In a monitor for photographic work how significant is 3% additional sRGB coverage?

I am looking for a new display. Photography is not my professional occupation but a hobby, but I still want to have a good enough results. After some investigation I came to following two displays ...
3
votes
3answers
253 views

Why are the color spaces we have access to incomplete?

The question, then: If all colors are combinations of red, green and blue, and my monitor's pixels use all three, why is its color space limited to so small a portion of the actual complete color ...
3
votes
3answers
407 views

Is it possible to convert to and from LAB color space without loss of quality?

Can I safely convert from sRGB or Adobe RGB to L*a*b color space and back without quality loss? Lab is the widest color space and therefore it should be possible to convert colors into this color ...
3
votes
1answer
468 views

What is the photopic luminous efficiency function?

What is the photopic luminous efficiency function? Is it actually a the, or are there multiple such functions? Is it an absolute fact of nature or simply an agreed-on standard? If the later, who says?...
3
votes
1answer
178 views

Are colour profiles ever stored in RAW files?

Recently on a wildlife photography course, the leader asserted that using aRGB in the camera settings meant less loss of data in the RAW file than if sRGB were used. As I did not understand this I ...
3
votes
1answer
236 views

Why is there such a big difference with these JPG file sizes?

I have 2 nearly identical JPG images that have been processed externally, but one file is much larger (in file size) than the other. I have been looking at all the metadata and embedded information ...
3
votes
1answer
312 views

What is happening when I convert from a source color space AdobeRGB to a Canon photo paper profile?

I'm converting my photos in photoshop from the source space of Adobe RGB to the destination space of Canon PRO-100 LU 1/2 Photo Paper Pro Luster and when I do this my colors change very drastically, ...
3
votes
5answers
198 views

Is there free software to compare gamuts?

This questions is related to Why did LR6 soft proofing thought some colors were out of gamut even if they turned out perfect? Since I found out some of my images are out of gamut of the printing ink+...
3
votes
1answer
425 views

Human perception in color mixing

Look at this image: 50% of its pixels are blue (0, 0, 255), 50% of its pixels are yellow (255, 255, 0). When I look at my computer display from a distance where I cannot distinguish the ...
3
votes
1answer
433 views

What's an easy way to batch assign (not convert) an ICC profile to .JPG and .CR2 Canon RAW files?

All of the files that comes out of my camera (Canon Rebel T3i) are not assigned a colorspace. Instead, all files the format IMG_XXXX.JPG/CR2 are implied sRGB and _MG_XXXX.JPG/CR2 are implied Adobe RGB ...
3
votes
3answers
193 views

Why can I see beyond sRGB in CIE Chromatic Diagram

According to CIE 1931 color space chart, the sRGB gamut is what's inside the triangle: As you can see from the diagram, blue is shown outside the sRGB gamut (at about 460 nm wavelength). Knowing ...
3
votes
1answer
2k views

What is the color reproduction accuracy on mid-2012 non-Retina Macbook Pro-s and how applicable it is for photo editing?

What is the color reproduction accuracy (sRGB color space coverage) for Apple Macbook Pro non-Retina models from mid-2012 and how applicable it is for photo editing? I read that MBP Retina display ...
3
votes
2answers
310 views

Should I perform the final color space conversion before or after final sharpening of an image?

When preparing an image for the web (or other media), the last two steps is usually to resize the image to the desired resolution and sharpen it at that resolution. However, when working in a larger/...
3
votes
1answer
108 views

How to avoid glare problems with insert-your-photo portfolio books?

Right now I am using the Itoya Art Profolio Expo 8.5X11 ("XP-12-8") and have my prints (Kodak Endura Lustre) and tear sheets sitting loose inside. The good thing is that the tear sheets are safe (I ...
3
votes
2answers
690 views

Does a YCbCr color picker exist for Windows or Unix?

Is there any YCbCr color-picker so that I can better understand the color space? For example, I want to get the range from the blue sky or from green grass. I need to know the value ranges to detect ...
2
votes
5answers
2k views

Why do my Photoshop/LR pictures look different on Facebook?

The left picture is the uploaded picture to Facebook, center picture is exported jpeg from photoshop and opened using Windows Photo Viewer, and right picture is open in Photoshop still. The center and ...
2
votes
3answers
424 views

How to save large photos with web safe colors?

When I'm done in photoshop I always use save for web to take care of color management so it looks the way I want in the jpeg, but it won't let me save photos any larger than 8191 pixels on a side, ...
2
votes
2answers
182 views

What colour space does Adobe Lightroom use when displaying photographs outside of the Develop module?

I've already read What colour space does Adobe Lightroom use in the Develop Module? this question but its leave two points unanswered: Does Lightroom use that particular color space throughout or ...
2
votes
2answers
107 views

What should I do with negative values when computing sRGB colors from spectra?

This question is from the computational side of things. Maybe some of you computational photography folks can help me out. If I have a normalized CIE XYZ tristimulus vector like this one: (x, y, z) ...
2
votes
2answers
2k views

Apple Aperture profile name (sRGB IEC61966-2.1 vs Camera RGB Profile)

I have a bunch of duplicate photos in Aperture. They came from separate iPhoto libraries. Some of the photos have the profile name sRGB IEC61966-2.1 and others Camera RGB Profile. Which should I keep?...
2
votes
2answers
298 views

What is the difference between HSV and CIE-Lab color space?

When do we (or should we) use HSV color space and when do we use CIE-Lab color space?
2
votes
1answer
260 views

RGB working color space that uses the L* tone response curve?

There are a couple of RGB color spaces out there - LStar-RGB.icc and ProStarRGB.icc- that use the L* tone response curve. What's the supposed advantage of using the L* TRC over using a gamma curve as ...
2
votes
2answers
164 views

Lossy, linear, 8-bit DNG colorspace technical explanation?

I read a few articles about lossy DNG, and here is a very technical thread for example: http://forums.adobe.com/message/4132283 I get what lossy means, but the other important aspect is that it's 8 ...
1
vote
1answer
1k views

What colour space does Adobe Lightroom use in the Develop Module?

What colour space does Lightroom use when you load an Adobe RGB or SRGB tiff/jpeg file into the Develop module? The reason I ask is because I was told that the develop module always uses the ProPhoto ...
1
vote
1answer
138 views

Color space encoding vs Color image encoding

Can someone explain to me, what's the difference between those to terms. I mean the space encoding I understand it as given the color space we define the depth (in bits) and value ranges that color ...