Profile issue

J
Posted By
jytzel
Nov 12, 2004
Views
209
Replies
4
Status
Closed
I usually tag my JPGs in sRGB profile. Yesterday I tried out of curiosity to "ASSIGN" an image with my monitor profile; the image turned slightly contrastier.
I’m a little confused. What would that mean? my monitor is slightly contrastier than it should be? Or should just ignore that finding?

regards,
J.

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G
gestels
Nov 12, 2004
J,

Assign means assign … you don’t really tag it, you just use it to convert the source (whatever profile was used to open it or that is tagged to it) to the destination (in this case your mon profile).
So "assign" simply replaces temporarly the profile that was originally tagged to the image with the one you select .

Pege

"Jytzel" wrote in message
I usually tag my JPGs in sRGB profile. Yesterday I tried out of curiosity to "ASSIGN" an image with my monitor profile; the image turned slightly contrastier.
I’m a little confused. What would that mean? my monitor is slightly contrastier than it should be? Or should just ignore that finding?
regards,
J.
GC
Graeme Cogger
Nov 13, 2004
In article ,
says…
I usually tag my JPGs in sRGB profile. Yesterday I tried out of curiosity to "ASSIGN" an image with my monitor profile; the image turned slightly contrastier.
I’m a little confused. What would that mean? my monitor is slightly contrastier than it should be? Or should just ignore that finding?
regards,
J.
A profile describes what colour the RGB values in a file represent. When you ‘assign’ rather than convert to a
different profile, you’re saying to ignore what colours the RGB values originally represented and to use a different set. You are actually throwing away any colour information for your image and assigning new information.

In general you should only assign a profile in one of 2 cases:

1) The image has no profile associated, but you know which one it should have (e.g. assigning a scanner profile to a raw scan)

2) The image has a profile associated with it, but it is the wrong one. I’ve no idea how you could get into this situation, so this would almost never be done

The fact that the image looks different when you assign a different profile is entirely normal and tells you nothing about either profile – it just means you’ve done something wrong 🙂
J
jytzel
Nov 14, 2004
Graeme Cogger …
In article ,
says…
I usually tag my JPGs in sRGB profile. Yesterday I tried out of curiosity to "ASSIGN" an image with my monitor profile; the image turned slightly contrastier.
I’m a little confused. What would that mean? my monitor is slightly contrastier than it should be? Or should just ignore that finding?
regards,
J.
A profile describes what colour the RGB values in a file represent. When you ‘assign’ rather than convert to a
different profile, you’re saying to ignore what colours the RGB values originally represented and to use a different set. You are actually throwing away any colour information for your image and assigning new information.

In general you should only assign a profile in one of 2 cases:
1) The image has no profile associated, but you know which one it should have (e.g. assigning a scanner profile to a raw scan)
2) The image has a profile associated with it, but it is the wrong one. I’ve no idea how you could get into this situation, so this would almost never be done

The fact that the image looks different when you assign a different profile is entirely normal and tells you nothing about either profile – it just means you’ve done something wrong 🙂

thanks. I just wanted to make sure I understood the whole issue correctly.
j.
TA
Timo Autiokari
Nov 14, 2004
On 12 Nov 2004 07:50:24 -0800, (Jytzel) wrote:

I usually tag my JPGs in sRGB profile. Yesterday I tried out of curiosity to "ASSIGN" an image with my monitor profile; the image turned slightly contrastier. What would that mean? my monitor is slightly contrastier than it should be?

When you have an image in the sadRGB color-space and you then Assign your monitor profile to that image then Photoshop shows the image to you exactly similarly as those programs in your system do that are not color-managed. In other words the RGB codes are sent to the monitor directly without any color-space conversion.

In case you see a difference at the moment when you perform this Assign operation it means that your monitor is not in the sadRGB space.

Generally the sadRGB space is not good for Web publishing since the the vast majority of the systems on the Web are not in the sadRGB but in the native color space of the CRT monitor that has the gamma 2.5 transfer function. Therefore it is not wise to calibrate the system into gamma 2.2 using the AdobeGamma or other such tool, this has only the effect that in such a system the images appear more bright compared to that how they appear in the Web in genereal. AdobeGamma allows to calibrate the system to gamma 2.5, simply write the value to the gamma box.

You can download the nativePC profile from my my site
http://www.aim-dtp.net/aim/download/aim_profiles.zip it is far better approximation for Web publishing than the sadRGB.

Timo Autiokari http://www.aim-dtp.net

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