Basic Photo Editing Using Gimp
Learn how to resize, crop pictures and reduce file size
Gimp is not a free
PhotoShop. PhotoShop is a very powerful tool that is also quite
expensive and takes more time to learn. If all you need to do is to
resize some photos, crop them or reduce the file size or format - GIMP is
free and will do all of that and much more.
It is also
important to note that you should only perform any of the actions below on
copies of your original photos. This is done just in case you make a
mistake, you then still have your original photo.
Download and
Install GIMP on your computer
Download and
install the latest stable version of
GIMP
Open your
photo using GIMP
Once installed,
open GIMP and click File / Open. Now use the explorer tool
to find the photo you wish to manipulate
Resize your
photo with GIMP
-
At the very
bottom of the window with your picture displayed by GIMP, note that the
size your are viewing may not be 100%. If you are working with a
picture you want to be able to view on your monitor without scrolling,
it is best to set this to 100%. This way, when you are done, you
are looking at the finished product, not a scaled down version of it.
This can be done by highlighting the current number and typing "100"
(without quotes) and hitting <Enter> on your keyboard.
-
In the window
with your photo, click Image / Scale Image. You will
then see the following window:

-
Modify the
number within the Width field to the size you want and then click inside
the Height field and it will automatically change to keep the same
width/height ratio. You can also do this by changing the Height
field and then clicking in the Width field. When you are done, click
Scale.
Note: If you only wish
to change the Width or Height, but not both and are not concerned about
distorting the image, this can be done by clicking the chain link to the
right of the Width/Height fields. This unlinks the two and they
can be changed independently. Once again, this will distort your
image if the change is anything but slight.
Crop your
photo with GIMP
-
Open your photo
within GIMP and set it to 100% as described above. Click on the
window selection tool that is boxed in red in the image below.

-
Place your cursor
in the spot that you want to be the upper left hand corner of your picture
and then hold down your left mouse button. Drag this down and to the
right until you have captured the area you wish to keep.
-
Click on Image
/ Crop to Selection. This will remove all of the original
picture that was not in your selection.
-
You can undo any
this action by clicking Edit / Undo Crop Image. This
must be done prior to saving the new image.
Saving and
Reducing your photo's file size with GIMP
You may want to reduce a photo's file size so that it is faster to email
or upload to a social networking site or web server.
-
When you are done
working with your photo or have just opened a photo and wish to make its
file size smaller, click on File / Save As.
-
A window opens to
allow you to rename the file if you wish. Rename the file and click
Save. If you do not alter the file name, you will need to
click Replace next. It is best to rename your file so that if
you reduce the file size (and picture quality) too much, you can start
over.
-
Next, the window
you see below will open. You can move the sliding bar or type the
number in the Quality field. I have found for images that are to be
viewed online you can go down to around 70 and still maintain a decent
picture quality. Once the Quality is set to where you want it, click
Save.
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