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by Lars Kotthoff

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30
votes
8answers
7k 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 ?
17
votes
3answers
771 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
5answers
1k 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, ...
14
votes
3answers
2k views

Are RGB numeric values equal to CMYK percentages?

are RGB numeric values equal to CMYK percentages?
13
votes
2answers
5k views

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

In talking to a colleague of mine yesterday, we got onto the subject of color spaces in digital photography. He's a Nikon buff, I use Canon (specifically, an EOS 50D); I don't know if that is relevant ...
9
votes
5answers
974 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. ...
9
votes
2answers
9k 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 ...
5
votes
2answers
5k 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 ...
4
votes
3answers
387 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
1answer
1k 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
votes
4answers
77 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
1answer
376 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 ...
3
votes
1answer
225 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 ...
3
votes
2answers
192 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
3answers
160 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!
3
votes
1answer
391 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 ...
3
votes
1answer
119 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
152 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
120 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
177 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
1answer
798 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
232 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 ...
3
votes
2answers
324 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
2answers
526 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 ...
1
vote
1answer
41 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 ...
1
vote
2answers
84 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 ...
0
votes
2answers
122 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 ...
0
votes
0answers
59 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
3answers
75 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 ...