Duotone gradient?

C
Posted By
Corey__K
Apr 30, 2004
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409
Replies
2
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Closed
I am trying to create a two-color gradient in Photoshop 7. What I need is a 2 color gradient, but the color of each individual pixel can only be one of the 2 colors. Imagine a gradient that consists of 100% color "A" pixels at one end, 100% color "B" pixels at the other end, and a gradual transition between color A and B. The gradient must be achieved by changing the percentage of pixels of each color from 100% A to 100% B, but there is NO mixing of the two colors at any one pixel. Can this be done? I need to import this image as jpeg, bmp or tiff into another application which will run a filter on the image. I can only have pure black pixels and pure white pixels, nothing else – but I do need to transition between the two colors.
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duotone gradient

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Mike Russell
Apr 30, 2004
CoreyK wrote:
I am trying to create a two-color gradient in Photoshop 7. What I need is a 2 color gradient, but the color of each individual pixel can only be one of the 2 colors. Imagine a gradient that consists of 100% color "A" pixels at one end, 100% color "B" pixels at the other end, and a gradual transition between color A and B. The gradient must be achieved by changing the percentage of pixels of each color from 100% A to 100% B, but there is NO mixing of the two colors at any one pixel. Can this be done? I need to import this image as jpeg, bmp or tiff into another application which will run a filter on the image. I can only have pure black pixels and pure white pixels, nothing else – but I do need to transition between the two colors.

Here’s one way:

1) fill the image with color A
2) create a new layer, and fill it with color B
3) set the second layer’s mode to "Dissolve"
4) add a layer mask to the upper layer, click on the mask in the layers palette, and use the gradient tool to make a black -> white gradient
5) flatten the image and save it in any format you want.

—

Mike Russell
www.curvemeister.com
www.geigy.2y.net
BV
Bart van der Wolf
Apr 30, 2004
"CoreyK" wrote in message
I am trying to create a two-color gradient in Photoshop 7. What I need is a 2 color gradient, but the color of each individual pixel can only be one of the 2 colors.

One of many ways would be to take an RGB or Grayscale gradient and convert to Indexed Color mode. There you could select Uniform Palette with 2 colors, Noise dithering. Then in the color table select the two colors you need to transition between.

Bart

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