How to Resize and Make Images Larger without Losing Quality


How To Resize Images And Make Images Larger Without Losing Quality
Nedra Vanhorn

A great example of what is going on when you enlarge a digital image is to understand what it is you are asking your computer to do. When you ask a computer to enlarge an image, you are asking it to create a new image of your photo in a larger size. In essence, you are asking your computer to guess what that image and each of its pixels would look like if it was larger. Though some software apps do a better job of guessing and recreating the image, they still have to make a guess. The greater variation of guessing or prediction that has to be made will determine how much the image is degraded. Interpolation is the prediction method used to achieve quality enlargements.

Resize and Make Images Larger without Losing Quality
Colleen Stanley

The bitmap is the most commonly used image format on the web. All your JPEG and PNG files are Bitmap image files. A bitmap image is made up of thousands of pixels. If you zoom in you can actually see those pixels as squares.

Each of these pixels is mapped to a fixed location on the image, hence the name Bitmap.
Most image editing software shrink or enlarge these pixels to resize an image. This is why when you resize an image to a smaller size there is no visible quality loss. Mainly because those pixels become even less visible.
On the other hand, when you resize an image to make it large, these enlarged pixels become more visible which makes the image look blurry and pixelated. Like this:

How to Resize Images to Make Them Larger (without losing quality)
Parthenia Fortier

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How to Resize and Make Images Larger without Losing Quality?
Dianne Hodges

A final piece of advice. The image formats used on the web, JPEG etc., are based upon compression algorithms which are not “lossless”, that is they are “lossy”. This means that every time you save the file you lose more of the original data. To prevent this always save your original images in a lossless file format such as PNG or TIFF. Edit that file to your hearts content, then save the production file in the JPEG or other format you require.

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