Re: Help re. colour differences in image viewers...

Hi John...

What you say makes perfect sense. I do believe that this is the base of
the problem. My monitor does have a preset calibration profile called
'srgb', even when I set this condition and then use the Spyder to produce a
profile, I still get naff results... which tells me its not even close to
the 'perfect' srgb condition that you speak about.
I'll have a look for the Microsoft 'Color' applet and check the
difference between the two profiles.
Maybe a return to a CRT monitor or possibly a different calibration
device may help. All this costs lotsa money though...

Best regards... Rob

"John Bean" <waterfoot@xxxxxxxxx> wrote in message
news:7hsfd35dt593oktdknglgu0hsbe9p1t1nb@xxxxxxxxxx
On Fri, 31 Aug 2007 11:34:01 +0100, "Rob B"
<rob.flyboy@xxxxxxxxxxxxxxxxxxxx> wrote:
Both RawShooter & PhotoShop display the same image colours. I'd like
to
think that they are both displaying the 'correct' colours and the other
viewers are displaying incorrectly.

That could be. Remember, Windows doesn't use profiles at all
itself, it just makes them available to applications that
can.

As well as building an ICC profile the calibration device
changes the video LUT so that the display now resembles sRGB
- how closely depends on the display itself and how good a
job the Spyder did.

Imagine you have a "perfect" sRGB display; in this case if
you display an sRGB image on it won't matter whether you use
a colour managed program or not, because there's no
difference between the image profile and the device profile
- it's a perfect match so no data changes are needed.

Now imagine you have a very inaccurate monitor; this time
its profile will differ dramatically from sRGB but a colour
managed program just alters the image colours so as to
produce the most accurate representation it can - in other
words it will try to make it look as it would on a perfect
sRGB device using what it finds in the device profile.
Windows on the other hand just treats the display as though
it really was a perfect sRGB device and dumps the unaltered
data to it, and this is the cause of your problem - Windows
actually *ignores* the profile, relying on the calibrated
device being perfect sRGB - and they rarely are in real
life.

I guess there's a possibility I overlooked earlier, maybe
your LCD isn't basically a sRGB device at all so the
generated profile isn't anywhere close to sRGB. If that's
the case you'll always have the problem since Windows
assumes the monitor to be a sRGB device. If you install
Microsoft's "Color" applet in the control panel it gives you
a simple way of inspecting the size and shape of the colour
space described in any ICC profile, so you can compare the
one built by the Spyder to standard sRGB and see for
yourself how big the differences are and in which colour
regions.

Windows and colour management are not exactly a marriage
made in heaven - more like "The Taming of the Shrew" ;-)

--
John Bean


.

Relevant Pages

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