Question on channels

MD
Posted By
Michael Duerr
Sep 18, 2007
Views
391
Replies
6
Status
Closed
When I select one of the three color channels from the
channels palette, it looks different compared to selecting the same channel with the channel mixer and 100%.

Why is this so? What is the difference?
Related Tags
channel question

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J
Joe
Sep 18, 2007
"Michael Duerr" wrote:

When I select one of the three color channels from the
channels palette, it looks different compared to selecting the same channel with the channel mixer and 100%.

Why is this so? What is the difference?

I have never looked at them the way you do to have much experience to share. But just by looking at the whole picture "channel" vs "channel" I see 2 different pictures.

– CHANNEL – You have the option to separate 3 channels in separated channel "Red, Blue and Green". Different mode’s gives you different channel’s

– CHANNEL MIXER – you are looking at the adjustment of the WHOLE RGB.

Hmmm.. I can’t find the best word to describe it, but if you look at many commands like "Level, Curve, Hue/Sat, Selective Color etc." you will see they have option to adjust many different colors (some even 2 levels deep).
MD
Michael Duerr
Sep 19, 2007
"Joe" schrieb im Newsbeitrag
– CHANNEL – You have the option to separate 3 channels in separated channel
"Red, Blue and Green". Different mode’s gives you different channel’s

– CHANNEL MIXER – you are looking at the adjustment of the WHOLE RGB.

Yes, but when I select 100% Red in the channel mixer I
thought this would give me the pure red channel as I see it in the channels palette.
But this is not so.
MR
Mike Russell
Sep 19, 2007
"Michael Duerr" wrote in message
[re channel mixer appearance]

Yes, but when I select 100% Red in the channel mixer I thought this would give me the pure red channel as I see it in the channels palette. But this is not so.

The most likely explanation is that your gray working space, in Color Preferences, is set to Photoshop’s default value of 10% dot gain, or some other setting that does not match the gamma of your RGB working space.

If you are using one of the gamma 2.2 RGB spaces, such as sRGB or Adobe RGB, open Color Prefs and change your gray working space to "gray gamma 2.2". Then you should get a match between the channel mixer results (which are displayed using the RGB working space profile), and the individual channel views (which use the gray working space profile).
—
Mike Russell – www.curvemeister.com
MD
Michael Duerr
Sep 19, 2007
"Mike Russell" wrote:
The most likely explanation is that your gray working
space, in Color Preferences, is set to Photoshop’s default value of 10% dot gain, or some other setting that does not match the gamma of your RGB working space.

If you are using one of the gamma 2.2 RGB spaces, such as sRGB or Adobe RGB, open Color Prefs and change your gray working space to "gray gamma 2.2".

Right, that was it.
Thank you, Meister!
J
Joe
Sep 19, 2007
"Michael Duerr" wrote:

"Joe" schrieb im Newsbeitrag
– CHANNEL – You have the option to separate 3 channels in separated channel
"Red, Blue and Green". Different mode’s gives you different channel’s

– CHANNEL MIXER – you are looking at the adjustment of the WHOLE RGB.

Yes, but when I select 100% Red in the channel mixer I
thought this would give me the pure red channel as I see it in the channels palette.
But this is not so.

Well, if you look at R, G, B channel from Channel you will see grayscale *not* pure R, G, B color.

I never toyed with it but I guess if you select RED color and want redist then you can always slide the slider to 100% (just guessing).
J
Joe
Sep 19, 2007
"Mike Russell" wrote:

"Michael Duerr" wrote in message
[re channel mixer appearance]

Yes, but when I select 100% Red in the channel mixer I thought this would give me the pure red channel as I see it in the channels palette. But this is not so.

The most likely explanation is that your gray working space, in Color Preferences, is set to Photoshop’s default value of 10% dot gain, or some other setting that does not match the gamma of your RGB working space.
If you are using one of the gamma 2.2 RGB spaces, such as sRGB or Adobe RGB, open Color Prefs and change your gray working space to "gray gamma 2.2". Then you should get a match between the channel mixer results (which are displayed using the RGB working space profile), and the individual channel views (which use the gray working space profile).

I think you may be right on this one, as I believe I saw one video tutorial covers this part. But I have never used to be able to remember the step(s) (I am talking in memory and about 90-95% sure)

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