Profile issue

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.

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
om...
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.

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

Graeme Cogger wrote in message ...
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.

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

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