If you mean your desktop/screen saver
control panel,display,settings you can make adjustments for more or less pixels or from the drop down list pick the appropriate level of color range or troubleshoot also select advanced then general
dpi normal size,larger size or custom settings
hope this helps
Open Desktop Background by clicking the Start button 
and clicking Control Panel. In the search box, type desktop background, and then click Change desktop background.
Click the picture or color that you want to use for your desktop background.
If the picture you want to use isn't in the list of desktop background pictures, click an item in the Picture location list to see other categories, or click Browse to search for the picture on your computer. When you find the picture that you want, double-click it. It will become your desktop background.
Look for pictures in other locations on your computer
Under Picture position, click the arrow and choose whether to crop the picture to fill the screen, fit the picture to the screen, stretch the picture to fit the screen, tile the picture, or center the picture on the screen, and then click Save changes.
Note
If you choose to have a fitted or centered picture as your desktop background, you can also frame your picture with a color background. Under Picture position, click Fit or Center. Click Change background color, click a color, and then click OK.
Tip
To make any picture stored on your computer (or a picture you are currently viewing) your desktop background, right-click the picture, and then click Set as Desktop Background.
The Set as Desktop Background option
You can add more desktop backgrounds to your collection from the Personalization Gallery on the Windows website.
Click the picture or color that you want to use for your desktop
background.
If the picture you want to use isn't in the list of desktop
background pictures, click an item in the Picture location
list to see other categories, or click Browse to search
for the picture on your computer. When you find the picture that you want,
double-click it. It will become your desktop background.
Under Picture position, click the arrow and
choose whether to crop the picture to fill the screen, fit the picture to the
screen, stretch the picture to fit the screen, tile the picture, or center the
picture on the screen, and then click Save
changes.
If you choose to have a fitted or centered picture as your desktop
background, you can also frame your picture with a color background. Under Picture position, click Fit or Center. Click Change background color,
click a color, and then click OK.
To make any picture stored on your computer (or a picture you are
currently viewing) your desktop background, right-click the picture, and then
click Set as Desktop Background.
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Right click on your desktop-Select personalize. This will open a window that asks you to select your desktop background
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