Working with Images

Red Hat Linux 8.0: The Official Red Hat Linux Getting Started Guide
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# Chapter 10. Working with Images

There are several types of image files. Some images are created using sophisticated software packages, while others are made from digital cameras and scanners. You may have downloaded some of these image files from the Internet or received them in an email. You may also want to create your own images to send to others. You can view and manipulate the most common types of image files using the many applications included in Red Hat Linux.

# Viewing Images

This section discusses some of the common tools for viewing image files. Certain tools available are specialized applications with several functions that enhance your image viewing experience; while others are general-purpose browsers that have some image viewing functionality.

## Using Nautilus to view Images

Nautilus is a general-purpose file manager and browser for your desktop environment. Nautilus has many functions beyond simple image viewing; however, for this section, we will use it for basic image browsing. For more information about Nautilus, see Chapter 1.

Nautilus is known for its ease-of-use, and it handles images with the same ease as it does for other file types. To begin browsing your image collection with Nautilus, double-click on your home desktop icon:

You will be presented with a view of all the files and folders within your home directory. Double-click the image (or folder containing the image) and Nautilus will open the new file or folder within its browser window. Figure 10-1 shows that Nautilus automatically creates thumbnails of any images in your folders:

Figure 10-1. Contents of a Folder in Nautilus

Double-click on any thumbnail icon to view the image in its native size. The image will load within the browser window, along with a thumbnail view and detailed file information along the left panel. Below the file information are advanced options for working with the file. By default, Nautilus offers you the option of opening the file with Eye of Gnome, a robust image viewer with more advanced imaging features than Nautilus.

To increase and decrease the size of the viewed image in Nautilus, click on the magnifying glass icon on the location bar as shown in Figure 10-2:

Figure 10-2. The Zoom Function in Nautilus

Click the + icon to increase the size of the image or - to decrease it.

## Using Konqueror to View Images

You can also use the Konqueror file manager to view images. If you chose KDE as your default desktop environment, click on your home directory desktop icon to access the Konqueror file manager:

Using Konqueror as an image browser works similarly to Nautilus. To configure Konqueror to view image files within a folder as automatically-generated thumbnail icons, choose View => Preview => Images. When you click on a thumbnail icon, the browser displays the image in its native size, as shown in Figure 10-3.

Figure 10-3. Viewing an Image in Konqueror

To zoom in and out of an image within Konqueror, you first need to change the way it renders the image. From the top toolbar, choose View => View Mode => KView. This will re-display the image and allow for zooming in and out using the two magnifying glass icons on the toolbar, as shown in Figure 10-4.

Figure 10-4. Zooming Buttons in the Konqueror Toolbar

You can also open the image with more advanced image viewers, as well as with the GIMP. Right-click on the image, choose Open With..., then Other.... A pop-up menu will appear allowing you to open the application you wish to use. To launch the GIMP, choose Graphics and scroll down the list of applications. Click on the GIMP icon and click OK, as seen in Figure 10-5.

Figure 10-5. The Open With... Dialog Box

## Using GQview

GQview is a powerful image viewer for GNOME desktop users that supports several image file formats, including:

- JPG/JPEG

- GIF

- PGM

- XPM

- PNG

- PCX

- TIF/TIFF

- PPM

- BMP

GQview is useful for viewing individual image files as well as browsing collections of files in folders. It supports zoom in and zoom out functions, as well as thumbnail views of all image files within a directory. It also supports several advanced options not found in the simple image viewers listed above.

GQview can be started from your desktop panel. Choose Main Menu => Graphics => GQview to start the application. If you are at a shell or terminal prompt, start the application by typing `gqview`. Upon start-up, GQview will browse your user home directory by default. If you have any images in this directory, the gallery panel will automatically generate thumbnails for you to highlight and view in the main display area.

Figure 10-6. GQview Displaying a `.jpg` Image

The interface of GQview is straightforward. The toolbar allows you to fit the image to the display window, zoom in and out and toggle between thumbnail view and text-only browser panels. It also has a text field for you to enter a particular path to your image directories. Right-clicking on an image in the display area opens a pop-up menu of image size and other file options such as renaming, moving, copying. You can also hide and unhide the thumbnail file panel and toggle windowed and fullscreen modes within the pop-up menu.

You can also combine functions within GQview and create a dynamic presentation effect for groups of images within a directory. In the text field below the toolbar, type the path to the the directory where your images are located and highlight the first image in the thumbnail file list panel on the left. Now press [V] then [S], and you will start a full-screen slideshow where GQview displays images against a black background over your entire desktop. By default, each image in the slideshow is presented for 15 seconds. You can stop and resume the slideshow at any time by pressing [S]. When the slideshow ends, press [V] to exit full-screen mode.

GQview can also be used to change your desktop wallpaper quickly and easily. Right-click on the image and choose Edit => Set as wallpaper. From the Edit menu, you can also choose to open the file with a number of image editing utilities, including the GIMP, Xview, and Xpaint.

GQview also allows you to customize several settings by clicking the Configure button:

The configuration pop-up menu allows advanced users to configure several options. You can customize a directory on startup, change thumbnail sizes, and even change the default image editors to manipulate the file if you would like to use one that is not listed.

Figure 10-7. The GQview Options Dialog Box

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