DIYLC has a bug where background images do not scale to 100% of the original image size
There is a way in DIYLC to adjust the scale as you add an image, but it is limited in how much you can alter the image scale
Make sure you check out the video's I did here for more info
https://el34world.com/Forum/index.php?topic=23814.0
To get an image to scale to the exact size you want, you have to multiply the width and height by 2.78 inches
The image has to be resized in your favorite image editor program
So for example you want to use a background image that is 10 inches wide x 3.125 inches tall
The image you use in DIYLC has to be resized like this
10 x 2.78 = 27.8 inches wide
3.125 x 2.78 = 8.69 inches high
72 pixels per inch
The attached images show how I do this in paint shop pro
Note that you have to uncheck the aspect ratio box or both the width and height will be changed at the same time
You want to be able to change the width and the height separately
The first image below shows a screen shot of the resize tool in paint shop pro
I resized the image to 27.8 inches wide x 8.69 inches tall at 72 pixels per inch
The second image shows that resized image in DIYLC
Notice that is close to 10 inches wide x 3.125 inches tall