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can I create a saturation mask based to a gradient map?

Jan 26, 2013 9:36 AM

Hi

 

can i create a saturation mask based on a gradient map?

 

for the example a gradient blue from 2441f6 to 6075f6

 

and have a luminocity mask based of this gradient

 

can i do it?

 

how can i do it?

 

 

thanks

cheers

 
Replies
  • Currently Being Moderated
    Jan 26, 2013 10:15 AM   in reply to mantralightroom

    There's an optional plug-in named HSB/HSL for converting between RGB, HSB and HSL which may help.

     

    CS6: http://helpx.adobe.com/photoshop/kb/plug-ins-photoshop-cs61.html#id_14 532

    CS5 (Mac): http://www.adobe.com/support/downloads/detail.jsp?ftpID=4965

     

    There'll be a Windows CS5-compatible download, too, I guess.

     
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  • Pierre Courtejoie
    7,038 posts
    Jan 11, 2006
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    Jan 26, 2013 10:20 AM   in reply to conroy

    Hello! Here is a tutorial on how to create a sat mask: http://retouchpro.com/tutorials/?m=show&id=151

     
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  • Pierre Courtejoie
    7,038 posts
    Jan 11, 2006
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    Jan 26, 2013 10:45 AM   in reply to mantralightroom

    I'd try to isolate that range, make a selection, maybe copy it to another document, then apply the technique, and copy the selection back to the first image. Difficult without seeing exactly what you mean.

     
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  • Currently Being Moderated
    Jan 26, 2013 10:56 AM   in reply to mantralightroom

    mantralightroom wrote:

     

    yes thanks

    i know about the plugins

     

    but the gradient map is created between a range of blue

     

    i would like to create the saturation mask based on this range

     

    how can i do it?

     

    thanks

     

    Oh yes, now I remember your other thread: can i create a color range saturation mask ?

     
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  • Currently Being Moderated
    Jan 26, 2013 12:23 PM   in reply to mantralightroom

    I'm confident that it can be done. Post your colour image and explain exactly what you want done.

     
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  • Noel Carboni
    23,478 posts
    Dec 23, 2006
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    Jan 26, 2013 4:20 PM   in reply to mantralightroom

    You want a mask that makes an image more transparent or less depending on the level of the color saturation?

     

    In an alternate document use that plug-in that was mentioned, copy the S channel, then paste it in a mask in the original image.

     

    Is it more complex than this?

     

    -Noel

     
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  • Pierre Courtejoie
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    Jan 11, 2006
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    Jan 26, 2013 11:44 PM   in reply to mantralightroom

    Did you look at the link I gave you? Duplicate your image, make a color range selection, invert, then desaturated or delete the rest, and follow the instructions...

     
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  • Currently Being Moderated
    Jan 27, 2013 5:19 AM   in reply to mantralightroom

    Something I don't understand: "i would like to use a gradient map to create the selection".

     
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  • Noel Carboni
    23,478 posts
    Dec 23, 2006
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    Jan 27, 2013 6:40 AM   in reply to mantralightroom

    To repeat what conroy just said:  Describe what it is you want to change about the image, and we'll work backward from there.  Do you want to make the blue parts of the sky bluer?  Change it to orange?  What?  Forget the terms, describe your goal.

     

    The terms you're throwing around aren't lighting the light bulbs above the heads of even the experts.

     

    -Noel

     
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  • Pierre Courtejoie
    7,038 posts
    Jan 11, 2006
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    Jan 28, 2013 2:47 AM   in reply to mantralightroom

    The gradient maps are not use to sample color, but to recolor, so you cannot use it to create the selection, use the selection to limit the gradient map to the blue areas of the sky.

    You could MASK a gradient map using the saturation of the sky, to recolor based on the actual saturation of the sky.

     

    Select the sky with your favorite method, jump it to a new layer (CTRL+J)

    Use the technique in the linked tutorial to extract the luminosity, it should land on its own layer.

     

    Hide that layer, and delete the selective color one.

     

    Now add your gradient map adj layer, enter the two colors as desired.

     

    Show the layer with the saturation converted to a layer. Select all, copy.

     

    ALT+click the layer mask of your gradient map adj layer, and paste. You might need to paint in black the areas you do not want affected.

     

    I tried it here, and had semi satisfactory results given the very heavy compression of your file, and also because the colors are pretty unrealistic.

    Here is the image showing the saturation mask, and the results on the side:

    satmask.jpg

     
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  • Pierre Courtejoie
    7,038 posts
    Jan 11, 2006
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    Jan 28, 2013 2:50 AM   in reply to Pierre Courtejoie

    If you simply want to sky to be bluer in the less saturated areas, add a Vibrance adjustment layer, and push vibrance, mask as desired..

     
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  • Currently Being Moderated
    Jan 28, 2013 5:09 AM   in reply to mantralightroom

    mantralightroom wrote:

     

    in short make the blue sky more blue

     

    Use a Vibrance Adjustment Layer with a mask that hides all except sky.

     
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  • Pierre Courtejoie
    7,038 posts
    Jan 11, 2006
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    Jan 30, 2013 11:35 PM   in reply to conroy

    Mantra were you able to do what you wanted?

     
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  • Pierre Courtejoie
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    Jan 11, 2006
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    Feb 1, 2013 2:38 AM   in reply to mantralightroom

    Glad it helped. I guess the missing part was alt-clicking to target the Layer mask.

    Here is a video on the topic:

     
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