This should be simple

P
Posted By
PJ
Dec 8, 2005
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297
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1
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I’m pretty ignorant when it comes to photoshop use, but this should be fairly easy.

I have an image with a simple solid gradient from top to bottom, say Color A to White, both 100% opacity. I have a second image in which the only difference is that the gradient is Color B to White. I would like to know how to adjust the first image so that it is exactly like the second image.

What Image -> Adjustment do I use and how do I figure out what values to input?

Thank you~
PJ
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MR
Mike Russell
Dec 8, 2005
"PJ" wrote in message
I’m pretty ignorant when it comes to photoshop use, but this should be fairly easy.

I have an image with a simple solid gradient from top to bottom, say Color A
to White, both 100% opacity. I have a second image in which the only difference is that the gradient is Color B to White. I would like to know how to adjust the first image so that it is exactly like the second image.
What Image -> Adjustment do I use and how do I figure out what values to input?

Method 1
———
The simple way, use Image>Adjust>Hue/Saturation to tune in the correct overall color. This may not be perfectly accurate, but it should get you very close. You can use eyedropper sample points, set to display HSB, to make this more quantitative.

Method 2
———
An absurdly simple way is to add the second image as a layer to the first, select Color mode, and flatten the image. I’m guessing this is not what you want.

Method 3
———-
You can get an arbitrarily accurate result using curves as follows.

In your A to White image, put an eyedropper sample the A end of the gradient, and write down or remember the color values.

Put an eyedropper sample in the same spot in your B to White image, and use curves to make the RGB three values match. Adjust only the black endpoint of each curve. You can also do this with levels by adjusting the black triangle.

The devil is in the details, and things like gamma, details in the mathematics of the gradient, and other color mathematics may prevent a perfect match. You may need to add one or more points to the curve for a more exact match. You will also need corresponding eyedropper points in your two images to get the target value.

If you are going to be doing much of this, the color pinning feature of Curvemeister will automate most of this task. The tutorial on Curve Extraction, which shows how to generate a curve to convert corresponding colors in one image to those of another image.
http://www.curvemeister.com/tutorials/CurveExtraction/index. html —
Mike Russell
www.curvemeister.com

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