Begin by finding images that are free to public Domain and copyright.
I am working with Photoshop 2 ...all instructions will be in this format.
you may use any program that you have by following the same basic steps that your program allows.
First I will start with the background.
Top Menu
A. Under file/ open find and open a background image you have saved and would like to use.
1.Top Menu
under Image scroll down to duplicate image/ click.
close original image.
2.Top menu
Image/ Resize/click
A box will appear
Resize your image as close to
2.5 width
3.5 height
300 Resolution
apply
Top Menu
View/ Fit on Screen
B. Next we are going to open and create a new box
1.Top Menu
File/New Image
A new box will appear
Name your image
here are your settings
Preset Custom Size
Width/ 2.5 inches
Height/ 3.5 inches
Resolution/ 300
Mode /RGB Color
Content/ Transparent
You should now have 2 boxes open. One with your resized image and one with your transparent box.
C. Click on your back ground image.
Over in your tool box
click on the move tool
should like an arrow
click on your background image and drag it over to your transparent box you have created.
Your image should now appear in your transparent box.
Fit to fill your box by
holding down the shift key and pulling along the sides and bottom to fit.
If you are satisfied with this as your back ground.
TOP MENU
file/ save as
Box will appear
name your image
save as png/ (option at the bottom of box)
Choose a folder to save in
Save
For the next step I will post on how to add an image into your back ground by removing the white space.
This is the basic steps you will follow each time you edit an image for your ATC.
Just practise it a few times and you will see it is not as difficult as I may have made it appear.
Please ask any questions you need and I will help you try and sort it out.
If you do not want to add anything into your back ground just go ahead and follow the first steps of resizing
and save as a jpg.