Image Editor Tool is among my favorite image editors. It's free, open-source, powerful, and it works well on both Linux and Mac computers. There are many ways to edit images with Image Editor Tool, but if you're just starting out I recommend using the simple yet effective command line tools. These tools are much faster than the GUI and allow you to get things done without having to go through menus or click around for hours. To learn how to use them effectively we'll start first with batch conversion.
The command line tool for converting
images is convert. You simply type that at the terminal prompt and
you'll see the following dialog box appear.
Here's what happens when you run the command line convert with no arguments (image filename):
This
window shows information about the file, including the size,
resolution, color mode, etc. Next we'll take a look at some basic
commands for resizing images:
To resize an image horizontally you'd enter:
You can also scale an image down in size by typing:
And to make it larger again:
So let's say you want to make some changes to the original file, then do this:
Now suppose you want to flip the horizontal orientation of this image upside down:
Now let's combine these two operations together:
If you want to change the background of an image, here is what would happen:
Finally, if you wanted to add text to an image you could do something similar to this:
I hope this helps! If you have any questions please feel free to ask.