JPG is the most popular image format, but it has one significant weakness: it has no handle alpha channel. Whenever you need a logo to sit on a colored background without white borders, you require PNG format.
Changing JPG to PNG is a straightforward task, however knowing when this is the correct option will save you time and avoid unnecessary file bloat.
The primary reason to convert JPG to PNG is to use PNG's alpha channel. This is critical for watermarks and interface elements required to sit cleanly into any background.
Something important to remember: converting a JPG to PNG does not create the clear background. You still more info need to remove the background through a photo editor such as Photoshop or GIMP.
Something to be careful about during conversion of JPG to PNG is that PNG files are almost always heavier than their JPG equivalents. This is because PNG employs non-destructive compression which stores complete image information.
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