This tutorial is designed to have you use a feature of Photoshop called 'edge detection'. This allows you to find the raw edges of an image without the image itself being present. You can then label distinguishing features and create a DataSlate SimpleStruct so you can view your images in DataSlate. Text that is in RED is a step that you will have to execute. Text that is in BLACK is for explanations.

In this tutorial you will 'edge detect' an image of Mahoney State Park in East Central Nebraska.

1) First start by finding the image Mahoney.jpg on the Farm CD. It should be in a folder called Week7, in CD Images.

2) Next open the file in Adobe Photoshop using the file/open/ command.

In Photoshop the control + makes the image larger, control - makes the image smaller. (If using a Macintosh substitute the Command key for control. ie Command + or Command -).

3) In Photoshop, go to filter/stylize/find edges. This will outline the edges on the image. It should look like the image below.

Now we will go about labeling key points using the text function of Photoshop. We will need to choose a text color that will show up well on the map. 4) In Photoshop double click on the foreground square. This will let you choose a color. Just click in the continuum of colors and select the color you want to work with. I have chosen red. 5) The text tool is the "T". Click on the text tool, then click on the river part of the image. You will get a box to type the text in. Type 'Platte River' and then click O.K. 6) Proceed to do this with whatever landmarks you want to label. I have done this for several landmarks below.

This is an image that is labeled in Photoshop.

7) You will now want to save your edge detected image. Go to Layer/flatten image to force your image into only one layer. 8) Go to File/save as... and choose a name that is different than the previous filename. Be sure to select the file type as a jpeg.

You now have two images that should be exactly the same size unless you did something with the image size feature. DON'T change the image size in this process. We will deal with images of different sizes later.... Now to create your DataSlate SimpleStruct. Click here to proceed. SimpleStruct tutorial.

To send your image to JPL and have it converted to SimpleStruct for use in DataSlate, you will need a username and password. Send for the username and password.