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Replace Color in object that is not contiguous

New Here ,
Oct 02, 2020

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Hello,

 

I am working with a topographic map that was scanned. I would like to replace the color of the forest within the map with a different green. The forest throughout the map is not contiguous.

 

Does anyone have suggestions on how I can change the green in the map to a different green?  I have attached a section of the map.

 

Thanks,

 

Brian

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Replace Color in object that is not contiguous

New Here ,
Oct 02, 2020

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Hello,

 

I am working with a topographic map that was scanned. I would like to replace the color of the forest within the map with a different green. The forest throughout the map is not contiguous.

 

Does anyone have suggestions on how I can change the green in the map to a different green?  I have attached a section of the map.

 

Thanks,

 

Brian

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Oct 02, 2020 0
Adobe Community Professional ,
Oct 02, 2020

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There are so many ways you can change the color. Just using Hue saturation to target the forest color:

Hue-sat.jpg

 

Or use color range to make a selection of of the green, then use a solid color fill layer with a mask created by color range. Maybe change the blend mode to multiply to get all the map detail The black and white section shows the mask created with color range:

color-range.jpg

 

Or you can convert it to L*A*B* color and use a curves adjustment layer to change the green color, then use blend if to target just the light greens of the map:

LAB.jpg

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Oct 02, 2020 0
New Here ,
Oct 03, 2020

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Chuck, thanks for sharing your solutions. This is great! One question-are there any tutorials or step-by-steps out there that will show me how to do the Hue/Saturation or the convert to L.A.B. color?

 

Brian

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Oct 03, 2020 0
Most Valuable Participant ,
Oct 03, 2020

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Screen Shot 2020-10-03 at 5.11.41 PM.png

Layers 2.png

Chuck presented a few excellent solutions and I would like to add another. It uses Lab Color mode in a different way.

 

1, First, the L channel is duped to create an Alpha channel.

  1. Then, copies of Lab’s  a  and  b  channels are combined (one of them inverted because Green is a minus value and Yellow is a plus value) to create the basis for a high contrast mask using Curves.
  2. The mask is then applied to a flat color as shown in the Layers panel. 
  3. Last, the Lightness alpha channel from Step1 is then added to restore all the black lines Blending mode: Multiply

 

Image 1: Original file

Image 2: A different Green

Image 3: A lighter value of the new Green

Image 4: Proof that any color and value can be easily used

 

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Oct 03, 2020 0
BrianDom LATEST
New Here ,
Oct 03, 2020

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Norman,thanks for sharing your solution as well. I appreciate it!


Brian

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Oct 03, 2020 0