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FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
Thread started 06 Nov 2010 (Saturday) 00:57
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Adobe RGB vs. sRGB

 
TitusvilleSurfer
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Nov 06, 2010 00:57 |  #1

If I understand correctly, sRGB is used for posting images on the internet. The colors and settings displayed on your monitor while editing transfer accordingly to the final image. Adobe RGB is used for printing, but I don't understand why. If I have my camera set to sRGB default, and later decide to print, am I at a disadvantage for not capturing the photograph in Adobe RGB initially or can I convert seamlessly between the two?
Really I'm just looking for clarification of when and why to use one or the other.


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kevindar
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Nov 06, 2010 01:11 |  #2

sRGB, Adobe RGB, prophoto RGB. In the order have increasingly wider color gamut. to even see the color of the last one, you need to have a wide gamut monitor. for the later two to see, you also need programs which are color profile aware. once you convert from the latter two to sRGB , there will a slight loss of information in color, and possible subtle changes and shifts. it is not something that you get back but converting back. its like taking a raw file, converting to jpeg, and then converting back to a 16 bit tiff. you dont get more information by converting it to a format that has more information capacity.
most new browsers are actually color aware. I know firefox is, and I think IE 8 is. so if someone is using the correct web browser, they can see srgb and adobe rgb. of course, if their monitor is not properly calibrated who cares. If the program is not color aware, then all the colors will look wrong. it also depends on who your audience is. the improvements of aRGB are subtle so best case senario, your audience with a calibrated monitor and right program can see it.
Printing, most of the mass print places (costco, cvs, wall mart, and such) assume your image is in srgb and print in in srgb. some costco places actually allow you to use the printer ICC profile to see excatly how your image looks if you are using photoshop. If you are printing at home, with LR or photoshop, the most important thing is to have the correct printer/paper profile combination assigned, and you get most accurate representation of what you are seeing on your screen, as long as your screen is calibrated. Hope that helps. Others may come by who are better at explaining this.


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TitusvilleSurfer
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Nov 06, 2010 01:54 |  #3

That answers all of my questions. Thank you so much! :)


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tonylong
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Nov 06, 2010 03:54 |  #4

Kevindar gave good info! As to why you might be in aRGB, the most typical reason why some people do is because aRGB can handle colors with a bright/saturated tone that can go beyond the capabilities of sRGB to display and/or print (some printers and more "photo-friendly" monitors handle a wider gamut than sRGB) and because of this having images in aRGB can preserve this wider range.

But, think of sRGB as "safe" in that it will handle your colors in a way that your variety of displays and printers can handle, but if you are dealing with images with bright saturated colors, one of your first tasks will be to tone down those colors to "fit" in the sRGB space. This is most effectively done if you are shooting Raw (it preserves all data with no color space "compensation") and you do the tonal corrections in a Raw converter.

In any case, as you noted, outputting images for "public consumption" or, say, use by clients, family, friends and such, is best done in sRGB because most of the "public" will not be using color-managed software.


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ChasP505
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Nov 06, 2010 10:13 |  #5

http://www.cambridgein​colour.com …als/sRGB-AdobeRGB1998.htm (external link)

https://photography-on-the.net/forum/showthre​ad.php?t=296149


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kirkt
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Nov 06, 2010 16:32 |  #6

To the OP:

You may find the list of threads at the bottom of this page informative.


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tonylong
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Nov 06, 2010 17:29 |  #7

kirkt wrote in post #11236791 (external link)
To the OP:

You may find the list of threads at the bottom of this page informative.

Heh! Sometimes I forget to glance down there before jumping in to respond to a question:)!


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tim
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Nov 06, 2010 20:21 |  #8

My general rule is if you're not confident in your color management knowledge and skills use sRgb for everything. Your images posted online and prints will all look good. Using wider color spaces has very few benefits for most people, and the complexity and risk of things going wrong is much higher outside of sRgb.


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TitusvilleSurfer
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Nov 06, 2010 22:10 as a reply to  @ ChasP505's post |  #9

Great information guys. Referring to "the list of threads at the bottom of this page", are you referencing this?

https://photography-on-the.net/forum/showthre​ad.php?t=296149
This thread is a gem and I am so happy to have found it! I usually check the stickies but just didn't notice it on this particular puzzle. Thank you all!


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tonylong
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Nov 06, 2010 22:55 |  #10

Ah, you didn't realize...

If you look at the very bottom of this page you will see a section called "Similar Threads". Just look at what's listed there, and you may get a smile on your face:)!


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TitusvilleSurfer
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Nov 06, 2010 23:28 |  #11

Oh wow...that seems pretty obvious hu? :) We all need the obvious pointed out from time to time I suppose. lol


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agedbriar
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Nov 07, 2010 08:15 |  #12

You should analyze the picture to determine if the highly saturated colors that AdobeRGB includes in their gamut, are present or not.

Because, in a group of 7 pictures I tested, all fitting into the sRGB gamut, each converted and saved in sRGB as well as AdobeRGB (both to 8-bit TIFF), the number of colors contained in the sRGB version was, on average, 38% higher than in the AdobeRGB counterpart.

In one sample, comprising mostly greens and very little else, the number of colors in sRGB was even 50% higher (green is the direction in which AdobeRGB expands most).

The "stretching" of the color points grid that the larger AdobeRGB gamut dictates, is obviously taking quite a toll.




  
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Wilt
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Nov 09, 2010 17:28 |  #13

some pertinent information

A very interesting dilemma about the issue of which color space...the ABSOLUTE NUMBER of hues (bits) is the same in both cases! Both color spaces map 16.7 million hues, but the range of hues is wider in the aRGB space. Let me state a counting analogy for those who do not grasp that concept...

Using a 4 bit numerical system, I can count from Zero to 15 in increments of one, or I can use the same four bits to count from Zero to 29 but leave some of the values out in between those extremes (e.g. instead of using the values of 8-4-2-1 mapped to the four bits, I map the values of 16-8-4-1 with the same four bits, so that I count as high as 29 in the sequence '0-1-4-5-8-9-12-13-16-17-20-21-24-25-28-29', rather than counting to 15 in the the sequence '0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15'


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TitusvilleSurfer
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Nov 14, 2010 02:47 |  #14

Thanks Wilt, that really helps me understand just what is going on here.


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Adobe RGB vs. sRGB
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