repairing channels

I have a severe problem with my blue and green channels on a bunch of digital files. Does anyone know if the red channel can be used to create a new green and blue channel?

You might be able to repair one weak channel. Two is asking too much.

Dan Margulis has a lot of useful information on plate blending in his book 'Professional Photoshop'. Parts of it are available on the web e.g. 'Plate Blending by Numbers' see http://www.ledet.com/margulis/Numbers.pdf

Dan always works in CMYK by the way neve RGB.

Hope this helps.

John

"anna" wrote in message

I have a severe problem with my blue and green channels on a bunch of digital files. Does anyone know if the red channel can be used to create a new green and blue channel?

John Rampling wrote:

You might be able to repair one weak channel. Two is asking too much.
Dan Margulis has a lot of useful information on plate blending in his book 'Professional Photoshop'. Parts of it are available on the web
e.g. 'Plate Blending by Numbers' see
http://www.ledet.com/margulis/Numbers.pdf

Dan always works in CMYK by the way neve RGB.

This is no longer true. Dan works in RGB as well as Lab. --

Mike Russell
www.curvemeister.com
www.geigy.2y.net

On Fri, 21 Jan 2005 09:21:32 GMT, "John Rampling" wrote:

You might be able to repair one weak channel. Two is asking too much.
Dan Margulis has a lot of useful information on plate blending in his book 'Professional Photoshop'. Parts of it are available on the web e.g. 'Plate Blending by Numbers' see http://www.ledet.com/margulis/Numbers.pdf
Dan always works in CMYK by the way neve RGB.

Not true. If you actually read the book you mentioned you'd see that he works in CMYK, RGB and LAB, using whatever colour space is most suitable to the image. Read Chapter 11 "All Colour Spaces are One".

--

Hecate - The Real One

veni, vidi, reliqui

True ...

IIRC he has even written an article or column titled something like "Every File has 10 Channels" ... RGB=3, Lab=3, CYMK=4 ... 3+3+4 = 10

See the archives of his articles and the "Color Theory" mailing list ... **lots** of good stuff for the technically inclined.

http://www.ledet.com/margulis/articles.html

http://www.ledet.com/margulis/ACT_postings/ACT.htm

"Hecate" wrote in message

On Fri, 21 Jan 2005 09:21:32 GMT, "John Rampling" wrote:

Not true. If you actually read the book you mentioned you'd see that he works in CMYK, RGB and LAB, using whatever colour space is most suitable to the image. Read Chapter 11 "All Colour Spaces are One".
--

Hecate - The Real One

veni, vidi, reliqui