Caution

Learn Photo Editing

Learn Photo Editing

Get Instant Access

If you intend to use the USB interface, don't start gPhoto before you've created an appropriate USB device file. You should also connect your camera, turn it on, and set it to its computer connect mode before starting gPhoto, so that gPhoto can find the camera.

After gPhoto is configured and running, you can click the Download thumbnail index icon to acquire thumbnail images of all the photos stored in the camera, as shown in Figure 13.7. You can then select specific images and click Download selected images to download the files. Each picture has its own tab in the main window. You can click a tab to view the image at full resolution. You can then perform certain transformations on these images, such as rotating them, flipping them, or adjusting their brightness, contrast, and color values, as shown in Figure 13.8. When you're done, you can save one or all images by clicking the Save open image(s) button. You can also print an image by clicking the Print image button.

Figure 13.8

Image editing features let you adjust images that have incorrect color balance or exposure.

Idd dAo 1<C

Figure 13.8

Image editing features let you adjust images that have incorrect color balance or exposure.

If you want to perform more extensive image editing, you can import the files downloaded by gPhoto into an image editing package, such as the GIMP (http://www.gimp.org). The GIMP offers very sophisticated tools for image manipulation, including everything offered by gPhoto plus much more. For more information on the GIMP, consult the program's Web site or a book such as Pruitt & Pruitt's Sams Teach Yourself the Gimp in 24 Hours, from Sams Publishing.

Part III

Grabbing Stills in Real Time with Video for Linux

One of the simplest ways to acquire still images from a WebCam is to use a program such as w3cam (http://www.hdk-berlin.de/-rasca/w3cam/). This program comes as source code and should compile smoothly on most systems. When compiled, the program vidcat is the one of interest. This program takes input from the /dev/video0 device (or another device you specify via the -d parameter) and sends it to standard output—the command line, by default.

Was this article helpful?

0 0
Learn Photoshop Now

Learn Photoshop Now

This first volume will guide you through the basics of Photoshop. Well start at the beginning and slowly be working our way through to the more advanced stuff but dont worry its all aimed at the total newbie.

Get My Free Ebook


Post a comment