Re: data echo
Re: data echo
- Subject: Re: data echo
- From: Roger Breton <email@hidden>
- Date: Sun, 18 Apr 2004 22:45:43 -0400
>
Can anyone explain to me how Lab mode retains the original control signals.
>
Since a file in Lab has no icc profile and the data is recorded in L*, a*,
>
b* by what mechanism does it retain a memory of the original RGB code that
>
produced the Lab code prior to conversion?
It does not retain a memory of the original RGB code. Once the color is in
Lab the transform has been consumed. The Source information is forever lost.
Unless I am not following...
>
For example
>
If I create two patches one RGB 1, 1, 1, and the other RGB 9, 9, 9, in Adobe
>
1998 and subsequently convert them to Lab, both patches will display Lab 1,
>
0, 0. However a second conversion to any other mode or space will, while
>
maintaining the Lab code 1, 0, 0 for both patches result in different data.
It seems to 'apparently' maintain the Lab code because the picker
simultaneously displays the RGB pixel value AND the corresponding Lab, if it
was to be converted to Lab. But it's just an 'illusion'.
>
J Swift
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.
| References: | |
| | >data echo (From: "John Swift" <email@hidden>) |