Re: [APML] Reflecting on Cygnus

["Robert Gendler" <robgendler@worldnet.att.net>]

Chuck,
I really don't know as much about profiles as you and Jerry.
All I can say is that the way the image is displayed on most
browsers is identical to when I view the tif file in PS saved
in sRGB. Thats the way I intend to display it. 


Rob 
email: robgendler@att.net
Web Site: http://www.robgendlerastropics.com
----- Original Message ----- 
From: "Chuck Vaughn" <aa6g@aa6g.org>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, July 04, 2005 4:05 PM
Subject: Re: [APML] Reflecting on Cygnus


> Hi Jerry,
> 
> Yes, I know there can be a big difference between color spaces. All  
> I'm asking Rob is which way is he intending people to view his  
> images, with the profile applied, or not. I asked him to perform that  
> test so he could see what a big difference there was. At least I  
> hoped he could see it.
> 
> With more of us going to new and brighter LCD displays, the  
> difference in the display gamut and sRGB is much larger than it was  
> between a typical monitor and sRGB. The difference I see here is  
> huge. I believe he has a new display himself and it was after he was  
> using it that his images looked much different. The difference is  
> mainly in brightness and not hue.
> 
> Chuck
> 
> ----------------------------------------------
> 
> >
> > Hi Chuck,
> >
> > If the image was meant to be displayed on a web page, then it's  
> > probably going to be displayed without the profile being applied,  
> > with an exception for Safari on a Mac (I think), so 99 percent of  
> > the people who look at it won't see the profile applied.
> >
> > But, there shouldn't be that much difference between having an sRGB  
> > profile applied and not having an sRGB profile applied on an  
> > average monitor, even in Safari. IF you have a monitor that is not  
> > going bad and if you have it correcly calibrated, and if you have  
> > your color management set up correctly (not only in Photoshop, but  
> > on the OS level, depending on your OS).
> >
> > You're throwing a monkeywrench into the works though by viewing it  
> > in Photoshop because when you view it without the profile applied  
> > in PS, it is going to display it in Photoshop's working color  
> > space, which you may have set to something like Adobe, which will  
> > significantly change the display because you are essentially  
> > displaying it with the wrong profile.
> >
> > You could change Photoshop's working color space to a wide variety  
> > of choices, and each time the image would look different. Sometimes  
> > radically different, such as if you chose Wide-Gamut RGB.
> >
> > What you're doing in your example is essentially assigning the  
> > wrong color space profile to the image if your working color space  
> > in Photoshop is set to anything except sRGB.
> >
> > Your example is intentionally mis-using color management, so it's  
> > no surprise that you would see quite a difference.
> >
> > Jerry
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