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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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123 views

In Lightroom how do you specify Perceptual or Relative when exporting image?

In Lightroom 6 I can use Soft Proofing to see what my image will look like with different profiles, and I can choose whether to do the conversion using Perceptual or Relative. However when I actually ...
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2answers
67 views

Is conversion from one colour profile to another clearly defined

Is conversion from one colour profile to the other other clearly defined ? If I change the ICC profile for an image from sRGB to another profile such as Adobe RGB will it be applied the same way by ...
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1answer
31 views

Does Soft Proofing to a different profile modify the actual photo

Am I right in thinking the difference between using Soft Proofing to a different colour profile (in Photoshop for example) and just changing the colour profile is that with Soft Proofing use of the ...
4
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2answers
85 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 ...
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7answers
1k 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 ...
2
votes
2answers
158 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 ...
4
votes
3answers
166 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 ...
2
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2answers
69 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) ...
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1answer
55 views

When to use LUV and not RGB colourspaces

Some applications extract information from images in the LUV colour space and not directly from the more commonly used RGB. Why is that?
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5answers
797 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 ...
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1answer
56 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 ...
2
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2answers
138 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?
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1answer
244 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 ...
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3answers
235 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 ...
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2answers
116 views

Photoshop working color space choices

I've always read that normal users should stick with AdobeRGB and not use ProPhoto for the working color space. But why? Does it affect the ability to edit and make sense of color changes? I ask ...
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2answers
101 views

Color profile from calibration affects Windows' Preview

I recently bought an X-Rite i1 Display Pro that I used to calibrate my notebook. I had some problems with the calibration, but it turned out that my settings were not perfect and in the end I managed ...
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2answers
259 views

How is data in a camera's colorspace transformed into XYZ or a standard RGB space?

I have a canon 600d that says it uses sRGB. How is this even possible without having the same spectral sensitivity spectrum as a standard observer? It is possible to define the matching functions of ...
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3answers
414 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 ...
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2answers
748 views

LightRoom 5 Export looks different to the Develop screen [duplicate]

I hope that someone might be able to help me here, I have recently started with DSLR photography and I jumped straight in at the deep-end I think (although i've used compacts and bridge cameras for a ...
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4answers
165 views

How does Saturation in Lightroom work?

I checked the HSB values (using Photoshop Elements) of the same pixel before and after a saturation adjustment in Lightroom - here is the information: Before Saturation: RGB: 159, 189, 233, Gray: ...
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1answer
57 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 ...
4
votes
1answer
446 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 ...
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0answers
98 views

Windows 7 how to switch through monitor ICC profiles and see instant change

Sorry for such a long title, but I have not been able to shrink it more than that :-). In windows XP there was a nice utility named WindowsColorSetup made by Microsoft. That was allowing to load and ...
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3answers
397 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, ...
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1answer
76 views

Color schemes and perception: If L*-linearity does not imply perceptual intensity linearity, then what is the best metric of perceptual intensity? [closed]

This question was in part motivated by this MathematicaSE question and Matteo Niccoli's geophysics blog post on color schemes. The underlying concept of Niccoli's perceptually-balanced color schemes ...
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1answer
289 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 ...
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3answers
213 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?
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3answers
163 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 ...
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2answers
134 views

Color spaces for large prints / and or web

I am using a MacBook Pro (2011) and edited a photo from camera raw into photoshop. The color space is set to sRGB within photoshop. I used Lightroom to export to JPEG while ensuring that the color ...
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7answers
847 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 ...
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0answers
32 views

For photos that end up on the web, does Adobe RGB matter? [duplicate]

To pay the bills I am a developer first, web stuff mainly. All of my photography, so far, has just ended up on the web, and I don't think that that will change anytime soon. I shoot in RAW and then ...
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3answers
127 views

does anyone see technical meaning in going from RAW to an 8 bit TIFF?

I was watching a video about frequency separation techniques for skin retouching in Photoshop. The subject is irrelevant, but I mention it because this comes from a decent source and a high-end ...
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1answer
879 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 ...
2
votes
1answer
209 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 ...
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3answers
342 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 ...
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0answers
167 views

Postprocessing ColorSpace: Windows System with two graphics cards (Quadro and GTX) one AdobeRGB the other sRGB color space

I couldn't find any satisfying answer to this question. I plan to build a postprocessing PC which has a Quadro K4000 and a GTX680 graphic card installed. I plan to buy two monitors which are: NEC ...
3
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1answer
206 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 ...
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5answers
4k 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. ...
3
votes
1answer
341 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 ...
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votes
4answers
199 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 ...
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votes
4answers
734 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!
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2answers
155 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 ...
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1answer
110 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 ...
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votes
3answers
120 views

Displaying an 8bpp image on 30bpp hardware, what to do with the extra bits? [closed]

I am building some hardware with a graphical user interface and my images are stored with 8 bits per pixel (bpp) in RRRGGGBB format. However, my video chip expects 30bpp pixels (10 bits for each ...
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votes
1answer
292 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
1answer
357 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 ...
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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 ...
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2answers
136 views

Colour Management

I have a laptop. I have an Xrite colour display calibration tool. I have CS6. It may seem an idiotic question but in all my reading no one explains it simply. I profiled my monitor. It gave me a ...
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votes
1answer
285 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 ...
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2answers
13k 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 ...