how would you fix WB in PS?

[Vic_izoita]

I have about 100 portrait jpeg pics that were shot with Nikon D1X and they are all little too warm. What would be the best way to lower the white balance temp using photoshop CS? .. I wish they were RAW format , then this would be a peace of cake to fix.
thanks in advance.
Victor

[maderito]

Color temperature is roughly the ratio of red to blue. To make an image cooler, increase blue and decrease red by approx. equal amounts. Doing the opposite warms an image.

You can do this using the Color Balance sliders and target highlights, midtones, or shadwos while preserving luminosity.

A better solution is to adjust the blue and and red channels in curves if you are adept in using them.

You can work on an adjustment layer, overdo the correction, and then reduce the opacity to achieve the desired result. This gives you the option to change later when you're in a different mood, and the image needs to be rewarmed again. :)

[Jesper]

In the Curves dialog, you can use the white / gray / black sample tools to adjust the image. To correct the color balance, use the gray sample tool to click on something with a neutral color in the image.

[maderito]

In the Curves dialog, you can use the white / gray / black sample tools to adjust the image. To correct the color balance, use the gray sample tool to click on something with a neutral color in the image.

Jesper gives good advice. If you want to fully color correct the image, neutralize the whites, grays, and blacks.

If you want to change the color temperature, you manipulate the ratio of red and blueness in the image.

In the PS RAW conversion color model, colors are a function of temperature, tint and exposure. Temperature is the proportion of blue and red in the image; tint is the proportion of magenta and green, and exposure is related to brightness. Color correction is thus accomplished by adjusting these variables.

Usually when we say that an image is too warm, we see an orange tint, which equals too much red+yellow. Yellow is the absence of blue. Thus you would correct excess warmth by increasing blue and decreasing red.

[Vic_izoita]

I tried adjusting blue and red and the results are great. Also im impressed with the sample tool... i love digital.
Thank you guys for your great replies.
Victor

[chris.bailey]

Variations can be a good PS tool to visually adjust the white balance especially if you are trying to warm a picture up or the like.