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Is there a way for AP to try out color choices for exterior house painting? I've separated out the main body, trim, garage doors, and front door. Then used the color palette from the paint vendor imported to swatches.  I created a fill layer for a color and made it a child of one of the segments then set the fills blend mode to "color". It "seems" like that should work but not sure I'm getting the correct rendering of the colors.
Suggestions?! Help please!

_HouseRendering.afphoto

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This is just for the garage door colours - I did not do anything to the other colours of the house - you will need to check/adjust them later

I added the 5 paint colours to the bottom of the screen as a swatches group just so I could see what I was aiming for.

I then added a black & white adjustment layer to the garage door to neutralise the existing colour and unticked the white fill layer you had

Then I changed all the paint blend modes from "Colour" to "Multiply"

 

_HouseRendering-b.afphoto


Due to the fact that Boris Johnson is now our Prime Minister, punctuation, spelling and grammar will never be worried about ever again.  We now have far bigger problems to be worried about.

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With the way the layers are arranged in @carl123's approach, the black & white adjustment also affects the garage door choices, thus eliminating every possible tint that a specific color may have. You can already tell from the "Wolverine" color that the original sample is very slightly tinted towards cyan but entirely loses that tint when it's applied to the garage door front. You need to drag out the Garage Door Choices group from the Garage Doors pixel layer and place it above the doors with a separate mask applied to it in order to retain the color.

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Or use grayscale versions of the areas to be painted:

graypaint_01.jpg.19cab939ccd882537eb9a754ca17d206.jpg'

 

graypaint_02.jpg.0655b62577d062657b34a00ef540f689.jpg

It is difficult to neutralize existing conditions (old paint, etc.) and simulate the effect of different lighting conditions, so here clear sunlight is assumed to give the swatch values (which is not realistic). Note that because of using Multiply blending, the color options need to be turned on solo.

 

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I had another look on this and realized that grouping of paints seemed to make it impossible to use the neutralizing Black & White Adjustment directly with the areas to be painted (without affecting the paints), but when the paints are ungrouped and the adjustment layer placed at bottom it works as expected. But paint options need to be kept as fills (vector objects) to use this method (and blend mode needs to be "Multiply").

UPDATE: Just learned that if a group has "Passthrough" blending mode, the underlying adjustment takes effect. 

I initially used conversion to grayscale to get a better conversion than what is achived by "Black & White" adjustment at default settings, but using the adjustment has the benefit of allowing playing with the light and shadow effect at will while having the paint applied. 

graypaint_03.jpg.e3280799271e5913ec7d53e68bc56bf0.jpg

 

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That looks like it's working.  What I did with the B&W Adjustment is push the reds and yellows to 200% to wash out the underlying color.

PushToWhite.thumb.JPG.d74d86b08bc473c8021f3b680705b9de.JPG

Then selected a color with the Multiply blend mode.

AddTheColor.thumb.JPG.2bec47e6a1981e19de4915837db40722.JPG

Also created a file with just the colors being considered.  It helps but the monitor colors never do match the paint chip samples we get.  I guess that's just the difference between on screen vs print / paint!

HouseSwatches.thumb.JPG.a13470094bde3bfd7f59078046b84f64.JPG

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