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Author Topic: Technical question about color space  (Read 4962 times)

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« on: April 01, 2014, 09:50 »
0
As my title, what kind of color space you guys use? sRGB or Adobe RGB? I know the A-RGB have a broader colour range than sRGB, so I tried to use A- RGB in my recently shooting. But there is a problem, when I upload these pictures into the stocksites, I found there are chromatic aberration in some sites like SS and FT. So I'm very confused in the color space. Which one you chose?


« Reply #1 on: April 01, 2014, 10:10 »
+2

Uncle Pete

« Reply #2 on: April 08, 2014, 22:21 »
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"un-tagged files will look very differently in all Web browsers"

No they don't look different, they look horrible and disgusting!

Good article.

sRGB is the correct answer.

http://www.gballard.net/psd/srgbforwww.html

mlwinphoto

« Reply #3 on: April 08, 2014, 23:15 »
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I upload in aRGB as some agencies convert larger sized files to Tiffs....seems like aRGB would give the buyer more options in terms of printing, etc.

I've not seen chromatic aberration result from uploading in aRGB as you seem to be seeing and I've never had a rejection for CA.   Are you sure it isn't there before you upload? 

Beppe Grillo

« Reply #4 on: April 09, 2014, 00:45 »
0
What is aRGB?
Do you mean RGBa?
« Last Edit: April 09, 2014, 00:49 by Beppe Grillo »

steheap

  • Author of best selling "Get Started in Stock"

« Reply #5 on: April 09, 2014, 09:38 »
+2
He means Adobe RGB. Alamy and the bigger macro sites often prefer that color space.

steve

Beppe Grillo

« Reply #6 on: April 09, 2014, 09:52 »
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He means Adobe RGB. Alamy and the bigger macro sites often prefer that color space.

steve

Ah ah, I thought it was RGB + Alpha channel
http://en.wikipedia.org/wiki/RGBA_color_space

« Reply #7 on: April 09, 2014, 10:20 »
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To SS you must upload in sRGB. They appear to ignore the color space when converting the images so if you upload in AdobeRGB your images will all look flat and  undersaturated. Most other agencies are the same with IS being the exception.

« Reply #8 on: April 09, 2014, 10:39 »
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My screen can only see about 75% of the colour palette for Adobe RGB, the brighter parts of the range are missing, so a correctly edited ARGB image will not display on my equipment.
It would obviously also be impossible for me to edit in ARGB because I would think the image was brighter than it was was and it would come out under-exposed (I think I was doing that at some point many years back, without knowing what was going on, to keep Alamy happy).
It may well be that SS is converting from ARGB to sRGB correctly, but people who upload in ARGB have used non-compatible equipment to edit the image, so their work will end up lacking bright colours.

« Reply #9 on: April 09, 2014, 11:07 »
+2
My screen can only see about 75% of the colour palette for Adobe RGB, the brighter parts of the range are missing, so a correctly edited ARGB image will not display on my equipment.
It would obviously also be impossible for me to edit in ARGB because I would think the image was brighter than it was was and it would come out under-exposed (I think I was doing that at some point many years back, without knowing what was going on, to keep Alamy happy).
It may well be that SS is converting from ARGB to sRGB correctly, but people who upload in ARGB have used non-compatible equipment to edit the image, so their work will end up lacking bright colours.


SS is NOT converting AdobeRGB to sRGB at least not on the website images, they simply leave it and ignore the colorspace leaving it as untagged that is why you need to upload in sRGB. I don't know about when someone downloads an image but if you submit AdobeRGB image it will appear muted. I know this because I have uploaded some AdobeRGB images with the profile attached and when viewing an image online it no longer matches my images. If I screen download my image, take it into Photoshop and then tell it to Assign Profile  (not convert!) AdobeRGB the image then appears correct.

I have quite a few images like this before I realized the problem.

Here is an example. Drag it to your desktop and then open it in Photoshop to see.
Go to Assign Profile and select AdobeRGB to see the correct colors.
I have too many images there to go back and re-upload them with sRGB.
This image was uploaded with AdobeRGB color profile intact.

http://image.shutterstock.com/display_pic_with_logo/1268305/140020126/stock-photo-lamb-chops-on-a-white-plate-with-red-wine-140020126.jpg
« Last Edit: April 09, 2014, 11:11 by DonLand »

« Reply #10 on: April 09, 2014, 11:27 »
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Glad you brought up the topic! I've been using AdobeRGB for all the sites, I guess because I started with Alamy and for print AdobeRGB is the preferred color space. Most of the time my color looks fine on SS but I'll experiment with my next batch and see how it goes. I thought they converted to sRGB on the site so the fuller color spectrum would be available for print, especially as I license a fair number of travel photos there as ELS. After reading this I'll try sRGB - anything that would make my photos pop more online makes more sense.

FYI: Here's a good explanation of the difference between "Convert to profile" and "Assign profile" : http://colormanagementinfo.com/Articles/Assign-vs-Convert/
« Last Edit: April 09, 2014, 11:39 by wordplanet »

mlwinphoto

« Reply #11 on: April 09, 2014, 15:45 »
0
To SS you must upload in sRGB. They appear to ignore the color space when converting the images so if you upload in AdobeRGB your images will all look flat and  undersaturated. Most other agencies are the same with IS being the exception.

I upload to SS in aRGB and when looking at my images on their site they look fine....both on my calibrated desktop and on my laptop.  I guess I have no idea what someone else may be seeing.

I'll have to experiment with my next batch to SS and give sRGB a try.

« Reply #12 on: April 09, 2014, 15:58 »
0
To SS you must upload in sRGB. They appear to ignore the color space when converting the images so if you upload in AdobeRGB your images will all look flat and  undersaturated. Most other agencies are the same with IS being the exception.

I upload to SS in aRGB and when looking at my images on their site they look fine....both on my calibrated desktop and on my laptop.  I guess I have no idea what someone else may be seeing.

I'll have to experiment with my next batch to SS and give sRGB a try.

Could it be that you are using a monitor capable of seeing the full gamut for Adobe RGB?

mlwinphoto

« Reply #13 on: April 09, 2014, 16:30 »
0
To SS you must upload in sRGB. They appear to ignore the color space when converting the images so if you upload in AdobeRGB your images will all look flat and  undersaturated. Most other agencies are the same with IS being the exception.

I upload to SS in aRGB and when looking at my images on their site they look fine....both on my calibrated desktop and on my laptop.  I guess I have no idea what someone else may be seeing.

I'll have to experiment with my next batch to SS and give sRGB a try.

Could it be that you are using a monitor capable of seeing the full gamut for Adobe RGB?

Dunno.  Just using an older iMac.

« Reply #14 on: April 09, 2014, 16:39 »
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I'm on a bog standard Samsung screen for a bog standard Windows machine.  Spyder tells me I can't even see 100% of the sRGB gamut, let alone the others.

« Reply #15 on: April 09, 2014, 16:48 »
0
To SS you must upload in sRGB. They appear to ignore the color space when converting the images so if you upload in AdobeRGB your images will all look flat and  undersaturated. Most other agencies are the same with IS being the exception.

I upload to SS in aRGB and when looking at my images on their site they look fine....both on my calibrated desktop and on my laptop.  I guess I have no idea what someone else may be seeing.

I'll have to experiment with my next batch to SS and give sRGB a try.

On some images it is subtle, others more noticeable.
The problem is SS views it as an untagged colorspace.
I know that when I upload an sRGB and an AdobeRGB image the sRGB matches on the web and the AdobeRGB is dull and undersaturated.

If you download one of your SS AdobeRGB images in Photoshop and your default color settings (command+shift+k on the mac) is set to AdobeRGB the image will appear correct (if you uploaded it in AdobeRGB) as the untagged image will then be viewed as if it were AdobeRGB and all is well, but... on the web it will not match.

The real problem is that SS does not carry over the colorspace embedded within the file for at least the display which is where the clients are doing the choosing to purchase our images. The default untagged colorspace is sRGB... so... I'd rather have the client see the image as I created it and not as a duller less saturated version.

Hope that helps explain what is actually going on.

If you don't see any difference than ignore all of this and be content with it and continue doing whatever you are doing now.


 

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