Acer Question

If you need a background image for your monitor then search for images larger than the resolution of the monitor.

after that look at how well it can be cropped to the aspect ratio of your monitor.

if certain details will end up off screen after cropping, see how complex the background around those details are then experiment with various content aware resizing tools in photoshop and if that fails, you can then move to duplicating the layer, lowering the transparenct of the top layer then move it up until the target detail is in the correct location, after that, see if it interferes with any other desired details or if it encroaches on a complex area of the background of the image. if it does not then you can move onto the next step

You will then need to mask around the desired detail that would otherwise be lost in cropping, (leave around 10-10 pixels around the detail not masked. you will then need to create a new layer, then examine the rest of the image for other desired details, then using the brush tool, make various marks while adjusting the softness, do this until you match the softness of the edges if the rest of the image. After that, delete that layer with the markings then go back to the original mask that you were working on, then using (assuming the texture on your table or mouse pad is uniform, in one continuous motion, mask around the rest of the detail with the edge of the brush tool circle touching the line of the detail that you want. (this will not work on complex objects such as something with hair sticking out or fur)

After doing that, you will have a properly cropped image with all desired details in view with matching edge softness.

Obviously this is time consuming so only do it if you find a really good background image that you just have to have and will likely keep for a long time. (images that contain foxes, ferrets, otters, bunnies, tigers, cheetahs and other similar animals contain extremely high levels of cuteness, thus making great backgrounds :) )