Image Manipulation
This section discusses:
Nautilus - image viewing
Nautilis (the file manager) allows viewing of
images.
If Nautilus isn't already running, start Nautilus,
by double-clicking on your home directory icon
on the screen background:
or type nautilus.
When you navigate to the location where the images are, you
will see "thumbnail" sized images, if "view as icons"
is selected - as circled below:
To fill the whole Nautilus window with an image, double
click on it.
You can then resize the image by clicking on the -
or + icons.
GQview - image viewing, slide shows, etc.
GQview can be used to view images and perform sides shows.
You can start GQview by either Start-->Graphics-->GQView
or typing gqview.
Below highlights some of the key areas and icons you'll be using
with GQview:
To start a full-screen slide show you would:
- Click on the thumbnail icon
in the upper left. That will cause
GQview to display small thumbnail-sized images instead
of only filenames.
- Set the delay between images by clicking on the Configure
icon
(a wrench) and setting the delay.
- In the same Configuration window, click on the Image
tab and select Fit image to window
- Click OK to the Configure window.
- In the bottom-left area, click on the first image
you want in the slide show.
- Type the letters v (for full-screen mode) then s
(to start the slideshow).
You can pause the slideshow by typing s and make it
no longer full-screen mode by typing v again.
To start the slideshow back at the beginning, you can click
on the first image you want in the slideshow.
Other useful keyboard shortcuts:
- Increase the image size: =
- Shrink the image: -
- Set the image to fit the current size of the
GQview window: x
- Zoom N-times bigger: 1 2 3 4
- Rotate, mirror or flip (try them): ] [ R M F
GIMP- a powerful alternative to Adobe Photoshop
Gimp
is likely already installed on your system.
To rotate an image with gimp:
- Click Start-->Graphics-->The Gimp and
click File-->Open...
or type gimp filename-to-rotate
- With the mouse over the image, hold the right button
down, which should bring up a menu and then navigate to:
Image-->Transforms-->Rotate-->90 degrees:
- You can then save the image by holding the right mouse
button over the image and navigating to: File-->Save
There are a number of sites and books devoted solely to
GIMP
listed below
Other options for image viewing and manipulation
- Viewing images: Use a browser such as mozilla or
konqueror
For the URL/location, type the filename
starting with file:// like this:
like this: file://pic.jpg.
Konqueror is more
powerful than mozilla for viewing images: After you are viewing
an image in konqueror, cilck: View-->View Mode-->Image Viewer
and you will then see icons that allow you to shrink
or increase the size of the image, rotate it, etc.
- convert (command-line image manipulation)
If convert isn't already on your machine, you
can install it from the
ImageMagick collection of tools which
is on the Red Hat 9 CD or can be
downloaded via rpmfind.
The command-line syntax is:
convert -rotate degrees infile.jpg outfile.jpg.
For example, if you want to rotate the image infile.jpg
90 degrees clockwise and place the rotated image in outfile.jpg:
convert -rotate 90 infile.jpg outfile.jpg
Or to rotate counter-clockwise, specify the degrees as a negative
value:
convert -rotate -90 infile.jpg outfile.jpg
Where to Get More Information
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