Nature Notes

May 15, 2008

Photoshop Tutorial-A simple Color Correction

Filed under: Photoshop Tutorial,Processing Tips — Tags: , — Harold Stiver @ 2:00 pm

This tutorial is done in PS CS2 but can probably be performed in many versions. It works best with images with a full dynamic range, that is with some portion of the image close to absolute white and also to black.

Original image (Photoshop Tutorial)

Original image

If you have a look at our original image you can see that it has a blue cast and is not well saturated for the red of the rocks of Bryce Canyon. What we are going to do is to set the black point or darkest portion of the image, and the white point or lightest.

First we need to find those parts of the image.
We use the command Image> Adjustment > Threshold. Under the histogram is a white triangle. We use our mouse to slide it to the left and then slowly bring it back. We watch the image till we see a nice block of black appear. This is where we will set our black point.

 image (Photoshop Tutorial)

Black Point Image

We then slide the triangle all the way right and bring it slowly back to find a nice block of white color, where our white point will be set. After we locate them, we can cancel the Threshold command window.

 image (Photoshop Tutorial)

White Point Image

Now we use the Curves command to set the black and white point

Image> Adjustment > Curves

First we will set the white point. Double click the far right eyedropper and change the R,G, and B values to 245 each, so that no portion is completely white. Click OK to close this window and use you right eyedropper to click on that portion of the image that you had previously determined was to be your sample.

 image (Photoshop Tutorial)

White Point Set Image

Now click on the left eyedropper. (You can leave it at your default value of true black) Click it on he portion of your image that you had previously determined was to be your black sample.

 image (Photoshop Tutorial)

Black Point Set Image

If you feel you have a true gray portion to the image, you can also use the middle eyedropper to sample it.

That’s it. You can see the dramatic improvement in our finished image.

 image (Photoshop Tutorial)

Final Image

Index to Photoshop Tutorials.

This tutorial is a part of the Photoshop Workflow Series

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