Shadowy Daisy

Shadowy Daisy
by damned-truths

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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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79 views

On iOS, why would one want to pick a 'video' pixel format (16-235) over a 'full' format (0-255)?

Take a look at this screencap from this year's WWDC session 501 "Advances in iOS photography". As an app developer, you can tell the camera subsystem to either use the 'video' pixel format or the '...
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1answer
205 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
votes
1answer
103 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 ...
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5answers
184 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+...
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7answers
193 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 ...
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1answer
70 views

Tagged or untagged sRGB images for web?

I have a situation and I am interested to find your point of view. We have a calibrated monitor at D6500, tone curve as measured ~2.4, white level ~90cd/m2 and a tagged sRGB / untagged sRGB image ...
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2answers
123 views

Why does the result of Photoshop Curves and Imagemagick Curves differ?

When using imagemagick to apply curves (convert -function), the output differs from the output when I'm using a curves adjustment layer in Photoshop. What is the reason for this difference? I'm using ...
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4answers
2k views

Are RGB numeric values equal to CMYK percentages?

are RGB numeric values equal to CMYK percentages?
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3answers
247 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 ...
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3answers
257 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 ...
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1answer
45 views

Soft proofing without physical printer in LR6

I've decided to print out one of my photos with a plotter. So to make sure I will get the right colors I've asked in the print shop what printer and paper are they using so that I can soft proof in ...
16
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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 ...
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1answer
175 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 ...
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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 ...
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1answer
202 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
70 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
38 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
118 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 ...
2
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2answers
175 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
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2answers
98 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
98 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
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 ...
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3answers
189 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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1answer
68 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 ...
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3answers
398 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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2answers
269 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
290 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
304 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
151 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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3answers
592 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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4answers
195 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: 28%...
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2answers
124 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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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. ...
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2answers
345 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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2answers
2k 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 ...
4
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1answer
639 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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3answers
422 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
88 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
372 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
265 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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2answers
144 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 ...
5
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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 ...
4
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7answers
911 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(...
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0answers
34 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 ...
7
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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!
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3answers
135 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
984 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
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1answer
254 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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1answer
230 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
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1answer
419 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 ...