compensating for color distortion caused by cataracts.

M
Posted By
Marc
Jan 10, 2004
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602
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2
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I have noticed lately that I perceive colors others tell me are neutral gray as light olive green. My Optometrist tells me that is caused by cataracts that are just beginning to appear.

I want to know if there is some way to compensate in Photoshop. Can I apply some filter that will compensate by "subtracting" the green that my cataracts are imposing on what I see.

My concern is that I will try to remove the apparent green from what is really a neutral gray and actually end up turning it red or something like that.

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Marc
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MR
Mike Russell
Jan 10, 2004
Marc wrote:
I have noticed lately that I perceive colors others tell me are neutral gray as light olive green. My Optometrist tells me that is caused by cataracts that are just beginning to appear.

I want to know if there is some way to compensate in Photoshop. Can I apply some filter that will compensate by "subtracting" the green that my cataracts are imposing on what I see.

My concern is that I will try to remove the apparent green from what is really a neutral gray and actually end up turning it red or something like that.

Certainly you can compensate using Adobe Gamma – set the sliders until the gray areas look neutral and you’re set.

But there is a better way to recognize and correct color casts. Whether your vision has a color bias or not, is to use the info palette to recognize a neutral gray area – use curves to set R, G, and B equal for a known neutral object in your image, and you’re there.

The curvemeister plugin also has a smarter neutral setting feature that may be of interest.
—

Mike Russell
www.curvemeister.com
www.geigy.2y.net
B
Bobs
Jan 10, 2004
On Sat, 10 Jan 2004 01:00:08 GMT, "Mike Russell" wrote:

Marc wrote:
I have noticed lately that I perceive colors others tell me are neutral gray as light olive green. My Optometrist tells me that is caused by cataracts that are just beginning to appear.

I want to know if there is some way to compensate in Photoshop. Can I apply some filter that will compensate by "subtracting" the green that my cataracts are imposing on what I see.

My concern is that I will try to remove the apparent green from what is really a neutral gray and actually end up turning it red or something like that.

Certainly you can compensate using Adobe Gamma – set the sliders until the gray areas look neutral and you’re set.

But there is a better way to recognize and correct color casts. Whether your vision has a color bias or not, is to use the info palette to recognize a neutral gray area – use curves to set R, G, and B equal for a known neutral object in your image, and you’re there.

The curvemeister plugin also has a smarter neutral setting feature that may be of interest.

As a starting point you could set your desktop to 128, 128, 128. Checking mine with a color densitometer there’s only a very slight correction from this required to measure a "perfect" neutral grey. There’s also a handy plugin, Vivid Details’ "Test Strip" that I use frequently to make assessments of hue. You might want to have handy a reference image that can be depended on to provide an accurately color-balanced image, and make your judgments about hue based on that.

Here is a reference image that might prove handy (get the "Violin Portrait").
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