Nature Notes

May 15, 2008

Photoshop Tutorial-Recovering blown highlights

Filed under: Photoshop Tutorial,Processing Tips — Tags: , — Harold Stiver @ 2:10 pm

This Photoshop technique allows you to add highlight information to your image. It is useful for images such as landscapes where portions of the sky have blown. Note you need an image which was shot in RAW to use this technique.

In our example, the portion of sky in front of the storm has some rose portions and then some blue sky, which can be seen when the exposure is reduced. We want a properly exposed image which incorporates this information.

1. Do an initial RAW conversion of your file allowing the highlights to remain blown but with the balance of the image in the right exposure. We’ll call this the light image.

Before image (Photoshop Tutorial)
Image 1
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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



All Images are Available for Licensing at Singular Video&Pix

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Photoshop Tutorial- Adding Canvas to an image

Filed under: Photoshop Tutorial,Processing Tips — Tags: , — Harold Stiver @ 12:47 pm

You’ve taken a lovely image but you wished you had left more room on one side. Here’s an easy method

Before image (Photoshop Tutorial)

The Before Image

1.Create some blank canvas on the side you wish to increase, {IMAGE > CANVAS SIZE}

Click on “RELATIVE” checkbox

Change WIDTH box (For example 200 pixels)

In the 3 x 3 box with arrows, click on the appropriate arrow. In our case we want more space on the right frame, so we click the middle arrow on the left.

Click “OK”

or another way

Use the CROP tool and drag it over the entire image. On the side you wish to add canvas, drag the box in the middle of the outline, and drag it away from the image with the mouse to a suitable distance. Click on the image to complete.

Increased blank  image (Photoshop Tutorial)

Image with increased blank canvas

2. Select the RECTANGULAR MARQUEE TOOL.

In the the STYLE BOX at the top of your window, select NORMAL.

Select the portion of the image you wish to expand. In our case, we select the area just to the right of the rock wren and rock, and just to the left of the new blank canvas.

Expanded  image (Photoshop Tutorial)

Expanded Image with Portion selected

3. Right-click on the selected area and pick FREE TRANSFORM.

Small boxes or “handles will appear at the edges of your selection. Hold your mouse button down over the the middle right handle, and drag it till it covers the blank canvas.

Double click within the selected space.

Extended  image (Photoshop Tutorial)

Image with extended area

4. Deselect and crop the image to your liking.

Final  image (Photoshop Tutorial)

Final Image

Index to Photoshop Tutorials.

This tutorial is a part of the Photoshop Workflow Series



All Images are Available for Licensing at Singular Video&Pix

Facebook Flickr Vimeo Twitter LinkedIn Contact Us License Images

May 13, 2008

Dunlin-Fattening up on the way north

Filed under: Birds,Point Pelee — Tags: — Harold Stiver @ 11:43 pm
Dunlin

Dunlin

I came across this ball-shaped Dunlin, (Calidris alpina) at Point Pelee. It was among a group of about 20 others who were feeding while making their way to the tundra of the far north to breed. But this Dunlin was not like the typical Dunlin like the image below. It kept itself hunched up in a ball like this but otherwise acted just like the others. Perhaps it had eggs ready to lay, or was ill, but it certainly looked different. (more…)

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