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Hello,

I have been reading that AdobeRGB colour space is capable of capturing a
wider colour gamut than sRBG so I wanted to do a non scientific test. I shot
a jpg image with my S2pro (which captures images only in sRGB unless
shooting RAW) which I brought into Photoshop and left the images color space
alone (just left it in sRGB) and the other image I converted to Adobe RGB
when I opened the image. As you can see from the sample the two images have
different colours and I find the sRGB one more pleasing. Can someone who
understands colour management take a look and tell me what is going on and
which image you feel is more pleasing. As well since my camera only captures
in sRGB is this even a valid test?

Cliff

http://www.cliffspicer.com/colour_test.jpg

"Cliff Spicer" <> staggered into the Bada Bing
and slurred:

>As you can see from the sample the two images have
>different colours and I find the sRGB one more pleasing. Can someone who
>understands colour management take a look and tell me what is going on and
>which image you feel is more pleasing.

I am no expert but to me it looks like the sRGB photo has slightly more red
in it. Perhaps the flowers threw off the color balance of the whole photo.
They both look fine to me though. The subject just looks like she's been in
the sun for an hour in the sRGB photo, compared to the other one.


"She's so fat, her blood type is Ragu."

The main purpose of AdobeRGB is to have a wider gamut to work with, during
photo editing.

If you open both images in Photoshop 6 or 7, they should look identical as
the colour management engine should take care of all color space
transformation.

However, AdobeRGB is not particularly intended for output (unless that's
what the output device is profiled to). For the web, you should concvert
your image back to sRGB. For printing, you should use whatever profile is
adapted to your printer and paper in the "Print with preview" dialog from
Photoshop.

It is quite normal that an image saved in AdobeRGB looks a bit dull in a
non-color management aware application such as Internet Explorer.

If your camera uses sRGB and your output is usually the web, choosing sRGB
as working space may be simpler and less confusing. In that case, there
would be little point of using AdobeRGB.

"Cliff Spicer" <> wrote in message
news:MkpTa.2193$...
> Hello,
>
> I have been reading that AdobeRGB colour space is capable of capturing a
> wider colour gamut than sRBG so I wanted to do a non scientific test. I
shot
> a jpg image with my S2pro (which captures images only in sRGB unless
> shooting RAW) which I brought into Photoshop and left the images color
space
> alone (just left it in sRGB) and the other image I converted to Adobe RGB
> when I opened the image. As you can see from the sample the two images
have
> different colours and I find the sRGB one more pleasing. Can someone who
> understands colour management take a look and tell me what is going on and
> which image you feel is more pleasing. As well since my camera only
captures
> in sRGB is this even a valid test?
>
> Cliff
>
> http://www.cliffspicer.com/colour_test.jpg
>
>
>

Something related, but indirectly. I use Capture One DSLR LE with my Canon
EOS 10D. In it, I set Wide RGB as my workspace. I then convert my RAW images
to 16-bit TIFF's and load them into Photoshop 7.0.1 which also has Wide RGB
set as the work space. Now I set up a soft proof to see what the image will
look like if converted to Adobe RGB. I also turn on gamut warning, which is
set to a neon green so that out of gamut areas show up better. In many
cases, it appears Adobe RGB is unable to completely encompass the RAW color
output from my camera because I get warnings on highly saturated reds,
oranges, yellows, and greens (dark and light). Soft proofing sRGB is much
much worse, showing that lot's of out of gamut colors my camera can capture
will be lost if I were convert to sRGB. So I'm stuck debating which to use
as my work space; Adobe RGB or Wide Gamut. Logically, if I want to go truly
archival and make sure that I'm not losing any of the colors my camera can
produce, Wide RGB should be my choice. But I've also read that there can be
problems using this color space because it is so big. On the other hand,
I've also noticed that when working in Wide RGB and soft proofing for
printers like the Frontier and Noritsu, it says no colors are out of gamut,
meaning these printers can reproduce all the colors that are there. If I
knew more about color management, I'd probably make my own custom workspace
just for working on 10D files, but unfortunately I can't. So what say the
color management geeks based on the info I've presented? Wide RGB or Adobe
RGB?

By the way, if anyone is interested I found a cool site that let's you
upload profiles and compare them in 3D, all via the web browser and for
free:

http://www.iccview.de/index.htm

"Cliff Spicer" <> wrote in message
news:MkpTa.2193$...
> I shot a jpg image with my S2pro (which captures images only in sRGB
unless
> shooting RAW) which I brought into Photoshop and left the images color
space
> alone (just left it in sRGB) and the other image I converted to Adobe RGB
> when I opened the image. As you can see from the sample the two images
have
> different colours and I find the sRGB one more pleasing.

I'm not sure what the single image you supply is supposed to prove. An
image that you convert in Photoshop to AdobeRGB will not look much different
to the sRGB original when you view it in Photoshop. (Clicking the preview
option on and off when you are converting it should demonstrate that). If
the files are tagged with their respective profiles when saved, any colour
managed application that opens them should display similar colours on the
monitor. OTOH, if you just open the files in a browser such as IE6 (not
colour managed), the files will look different. because the Adobe RGB file
needs converting to the sRGB colour space. This is why when you use the
Save for Web option you should convert the image to sRGB first.

John

>
> I'm not sure what the single image you supply is supposed to prove. An
> image that you convert in Photoshop to AdobeRGB will not look much
different
> to the sRGB original when you view it in Photoshop.

Hi John,

Thanks for your reply but I guess you missed the point or I didn't explain
it well. It was opened in PS (color managed environment) and the embedded
profile (sRGB) was ignored and Adobe RGB was assigned as the new profile.
Then the two images were compared in Photoshop and they looked considerable
different. This difference is also apparent in IE even though it is not a
managed app. My question was best answered by Tom in that by converting from
one space to another I am clipping my colour gamut yet I am not sure how
going from a narrow (sRGB) colour space and converting to a wider one(adobe
RGB) is throwing away info but he did say it would be compressed so maybe
that explains the flat colours, but I will need to look at the document he
suggested.

Cliff