Re: There is no place for individual taste in screen appearance.
Re: There is no place for individual taste in screen appearance.
- Subject: Re: There is no place for individual taste in screen appearance.
- From: David Wollmann <email@hidden>
- Date: Sun, 08 Jun 2014 12:45:50 -0600
John Robert Robinson, something we still need to clear up is your assertion that your are measuring some color. If you are using the eye-dropper in Photoshop or any of the other cursors, you are not measuring anything. The cursor is simply reporting a number derived from the opened file. The numbers mean nothing without a profile. The ICC color profile provides the definition for the numbers. The document needs a profile to define the “colors” and Photoshop needs to reference that through a profile that describes or characterizes the display.
All RGB profiles use a scale of numbers from 0 to 255 but ProPhoto can produce saturated colors that sRGB never could. The scale is different, the distance from the center to the edge is greater, and the further from the center, the more saturated the color. ProPhoto is larger, sRGB is much smaller and their shapes differ. The center is always zero and the edge is always 255. Color is 3 dimensional and the shape varies from one profile to another. The top at the center is white and the bottom at the center is black.
That’s why we convert from one color space to another - to preserve the color appearance on some other device. This is the only time a profile becomes active because the conversion does change the numbers but preserves the appearance. Assigning changes the appearance but not the numbers. Seems counterintuitive but its not when you understand the size and shape of color profiles.
I had to chuckle at John Gnaegy’s use of “salmon” as a color reference for I was coming up with a very similar example.
To illustrate this, create a new RGB document in Photoshop, make it sRGB. Go to the color picker and make a new RGB color using R255, G128, B128. Fill your new document with that salmon color. Now go to Edit > Assign Profile, and make sure the Preview check box is selected. Assign ProPhoto, you will see the color change to “Magenta.” Now assign ColorMatch RGB and you will see the color shift to a washed out version of “Salmon.”
If you also had your info palette open when doing the Assign Profile, you would also notice that the numbers did not change at all, just the appearance.
The numbers by themselves mean nothing. The color profile is paramount in providing definition to the numbers.
Also when using the eye-dropper in Photoshop to report on the numbers, and especially when checking the cleanness of the whites - avoid the use of Point Sample, which is a single pixel. Use a 3x3 matrix, the average of nine pixels, or use 5x5 the average of 25 pixels, that will give you a much better representation of any tint your whites may have.
David Wollmann
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