How to create heat map from multiple images

[NardDog]

Hi everyone,

I have a number of images containing body outlines with different shaded areas (examples) and want to merge/stack them all so the most frequently marked areas are darker (like a heat map but just a single color is fine). When I apply a mean stack, the colors are too light. Is there a better way to achieve the desired effect?

TIA

Edited April 27, 2023 by NardDog

[firstdefence]

Paint onto a pixel layer at 100% opacity and simply turn the opacity of the layer down until it's to your liking. You can use different colours to indicate different heats and apply a posterise adjustment filter to get the heat gun look.

Without Posterise.

With posterise

[firstdefence]

[NardDog]

Thanks for the suggestion.

However, I would like for the areas of intensity to be the actual representation from the original images, rather than visually painting what the final result should look like – if that makes sense. 

(Actually I think your now deleted comment with different pixel layers could potentially work - will give it a try.)

Edited April 27, 2023 by NardDog

[carl123]

Do you mean like this (below image)?

PS If you want an even darker red colour change all layers from Multiply to Linear Burn (Blend mode)

 

 

[firstdefence]

@carl123 yes similar, but using the body map as a background and then creating pixel layers with the brush set to say 10% opacity.

[firstdefence]

6 hours ago, NardDog said:

Thanks for the suggestion.

However, I would like for the areas of intensity to be the actual representation from the original images, rather than visually painting what the final result should look like – if that makes sense. 

(Actually I think your now deleted comment with different pixel layers could potentially work - will give it a try.)

Yes I discounted it because  it seemed like work for works sake when simply using 100% brush opacity and dialling the layers opacity down does the same thing with one layer over that of multiple.

[Pšenda]

6 hours ago, NardDog said:

However, I would like for the areas of intensity to be the actual representation from the original images, rather than visually painting what the final result should look like – if that makes sense. 

Do you have images without a white background? (for example after using the Erase White Paper filter). Then you can just layer them on top of each other - the black outline of the character is still black, and the red areas will intensify.

 

Heat map.afphoto

Edited April 27, 2023 by Pšenda