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can i create a saturation mask with a gradient map

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  #11  
Old 01-27-2013, 11:25 AM
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mantra mantra is offline
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Thumbs up Re: can i create a saturation mask with a gradient

Quote:
Originally Posted by chillin View Post
Thanks 0lBaldy & redcrown.
Here is the outcome of your suggestions.
wow
yes
how did you do it?

may i know steps by steps ?
but you did not use a gradient map to select the range of blue to change(darken or lighten)
greetings
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  #12  
Old 01-27-2013, 11:34 AM
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Re: can i create a saturation mask with a gradient

The layer 2 is a gradient fill with saturation mask accentuated with a level adjustment & a blending selected as color.
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  #13  
Old 01-28-2013, 01:04 AM
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Question Re: can i create a saturation mask with a gradient

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Originally Posted by chillin View Post
The layer 2 is a gradient fill with saturation mask accentuated with a level adjustment & a blending selected as color.
and the mask on the group?
thanks
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  #14  
Old 01-28-2013, 05:01 AM
Tom_M Tom_M is offline
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Re: can i create a saturation mask with a gradient

Use the old HSB / HSL plugin (http://www.adobe.com/support/downloa...jsp?ftpID=4050 or http://myphotohero.blogspot.com/2009...b-plug-in.html ) . Luminosity will be shown in the red channel, saturation in the green channel, etc.

Make a copy of the green channel and you have your saturation mask.

You can now apply that mask to any image or adjustment layer. The most saturated pixels in the underlying image will now have the highest opacity, whereas the least saturated pixels will have the lowest opacity (ie, most transparency). You can modify that mask by any means you want including inverting it, increasing its contrast, etc.

It seems that you also want to apply a second mask to the previous image or adjustment layer. To do so, follow the suggestion given by Redcrown: "Then put that layer in a "Group" and add the second mask (sky?) to the Group..."

I recently gave an example of this technique over in the photoshopgurus.com forum:
http://www.photoshopgurus.com/forum/...gle-layer.html

HTH,

Tom M
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  #15  
Old 01-28-2013, 08:41 AM
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Re: can i create a saturation mask with a gradient

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Originally Posted by Tom_M View Post
<clipped>

It seems that you also want to apply a second mask to the previous image or adjustment layer. To do so, follow the suggestion given by Redcrown: "Then put that layer in a "Group" and add the second mask (sky?) to the Group..."

I recently gave an example of this technique over in the photoshopgurus.com forum:
http://www.photoshopgurus.com/forum/...gle-layer.html

HTH,

Tom M
Thanks for improving my workflow and reducing my memory requirements with this example.
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  #16  
Old 01-28-2013, 10:22 AM
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Re: can i create a saturation mask with a gradient

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Originally Posted by Tom_M View Post
Use the old HSB / HSL plugin (http://www.adobe.com/support/downloa...jsp?ftpID=4050 or http://myphotohero.blogspot.com/2009...b-plug-in.html ) . Luminosity will be shown in the red channel, saturation in the green channel, etc.

Make a copy of the green channel and you have your saturation mask.

Y

Tom M
hi Tom
why
Quote:
Luminosity will be shown in the red channel, saturation in the green channel, etc
.
it's HSB -> HSL (Hue, Saturation and Lightness
or HSB (Hue, Saturation and Brightness)
on the red should be hue
gree saturation
blue lightness

am i correct?

thanks
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  #17  
Old 01-28-2013, 11:38 AM
Tom_M Tom_M is offline
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Re: can i create a saturation mask with a gradient

Q: "Why"

A: Because that's the way the plugin was designed to work.

When you use it to convert an RGB image to HSB or HSL, the plugin replaces the red channel with hue information, the green channel with saturation information, and the blue channel with either "brightness" (B) or "lightness" (L) information, depending on which transformation you requested.

You can then operate on the three channels independently, in any way you want. When you command the plugin to recombine them, it takes the new values in each of the three channels, interprets them in the same way as described above, and performs the inverse transformation back to (say) RGB. It's a bit odd, but, once you are used to it, this routine works quite well.

HTH,

Tom M
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  #18  
Old 01-29-2013, 12:41 AM
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Re: can i create a saturation mask with a gradient

Quote:
Originally Posted by Tom_M View Post
Q: "Why"

A: Because that's the way the plugin was designed to work.

When you use it to convert an RGB image to HSB or HSL, the plugin replaces the red channel with hue information, the green channel with saturation information, and the blue channel with either "brightness" (B) or "lightness" (L) information, depending on which transformation you requested.

You can then operate on the three channels independently, in any way you want. When you command the plugin to recombine them, it takes the new values in each of the three channels, interprets them in the same way as described above, and performs the inverse transformation back to (say) RGB. It's a bit odd, but, once you are used to it, this routine works quite well.

HTH,

Tom M
thanks Tom
but you wrote ->
Quote:
Luminosity will be shown in the red channel, saturation in the green channel, etc.
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  #19  
Old 01-29-2013, 06:42 AM
Tom_M Tom_M is offline
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Re: can i create a saturation mask with a gradient

Ahhh ... I didn't understand what you were getting at. I see the problem now. Sorry, I was typing too fast in the 1st post. The order of the channels is as I stated in my 2nd post.

Tom M
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  #20  
Old 01-29-2013, 11:10 AM
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Re: can i create a saturation mask with a gradient

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Originally Posted by Tom_M View Post
Ahhh ... I didn't understand what you were getting at. I see the problem now. Sorry, I was typing too fast in the 1st post. The order of the channels is as I stated in my 2nd post.

Tom M
thanks Tom
may i know the different between brightness and lightness?
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