white wall

D
Posted By
dir
Mar 2, 2005
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887
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6
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How can I fix the blue tint af the wall to make the wall white using photoshop?

Ik hope you understand my question. thx
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Scott Schwartz
Mar 2, 2005
"dir" wrote in message
How can I fix the blue tint af the wall to make the wall white using photoshop?

Ik hope you understand my question. thx

If I understand you correctly you could use the hue and saturation opeion to reduce the amount of cyan in the image slighly to wash out that area. If you cans elect the wall specifically you won’t have to worry about washing anything else out.
LC
Larry CdeBaca
Mar 3, 2005
PS7: Image|Adjustments|Replace color

"dir" wrote in message
How can I fix the blue tint af the wall to make the wall white using photoshop?

Ik hope you understand my question. thx

MR
Mike Russell
Mar 6, 2005
dir wrote:
How can I fix the blue tint af the wall to make the wall white using photoshop?

Ik hope you understand my question. thx

This is called a color cast, and there are a number of ways of getting rid of it. One easy way is in Curves. Click on the gray eyedropper button, then click on the wall. Voila – the blues are gone, or mostly gone. Tweak the endpoint of the blue curve to make it straighter and you’ll be even closer. This technique works well if you have blue shadows, but the rest of the image is warmer in color, because you can get the blue out of the shadows only, and leave the rest of the image alone.

This works even better in Lab mode, but with a slightly different procedure. Convert to Lab, and control click on the wall. This creates a control point near the middle of the a and b curves. Select each of these points, and type in a zero for the righthand value, and your blue color cast will be removed, in some situations more cleanly than is possible in RGB mode. —

Mike Russell
www.curvemeister.com
www.geigy.2y.net
J
Jan
Mar 7, 2005
Mike Russell wrote:

dir wrote:

How can I fix the blue tint af the wall to make the wall white using photoshop?

Ik hope you understand my question. thx

This is called a color cast, and there are a number of ways of getting rid of it. One easy way is in Curves. Click on the gray eyedropper button, then click on the wall. Voila – the blues are gone, or mostly gone. Tweak the endpoint of the blue curve to make it straighter and you’ll be even closer. This technique works well if you have blue shadows, but the rest of the image is warmer in color, because you can get the blue out of the shadows only, and leave the rest of the image alone.

This works even better in Lab mode, but with a slightly different procedure. Convert to Lab, and control click on the wall. This creates a control point near the middle of the a and b curves. Select each of these points, and type in a zero for the righthand value, and your blue color cast will be removed, in some situations more cleanly than is possible in RGB mode.

Wouldn’t the eyedropper technique also work with levels?

Jan
MR
Mike Russell
Mar 7, 2005
Jan wrote:
[re using curves in RGB and Lab mode get rid of a blue cast on a white wall]

Wouldn’t the eyedropper technique also work with levels?

There is a gray dropper in Levels, and it will work well some of the time, but there are two problems. In RGB mode, you can’t adjust the endpoints of the blue channel to refine the adjustment because it will move the gray slider, changing the neutral. In Lab mode, because ctrl-click is not available, it is difficult to determine which specific a and b value to change to zero.

Besides, levels is curves with one point – why limit yourself? —
Mike Russell
www.curvemeister.com
J
Jan
Mar 8, 2005
Mike Russell wrote:

Jan wrote:
[re using curves in RGB and Lab mode get rid of a blue cast on a white wall]

Wouldn’t the eyedropper technique also work with levels?

There is a gray dropper in Levels, and it will work well some of the time, but there are two problems. In RGB mode, you can’t adjust the endpoints of the blue channel to refine the adjustment because it will move the gray slider, changing the neutral. In Lab mode, because ctrl-click is not available, it is difficult to determine which specific a and b value to change to zero.

Besides, levels is curves with one point – why limit yourself? —
Mike Russell
www.curvemeister.com

Thanks much, Mike.

Jan

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