JPEG is the world's most image format, however it has one important weakness: it has no handle transparent backgrounds. Whenever you need a graphic to display on a patterned surface with no background artifacts, you must use PNG file type.
Changing JPG to PNG is a straightforward task, however knowing when this is the right choice will save effort and eliminate unneeded large files.
The main reason to convert JPG to PNG is to gain access to PNG's alpha channel. This is critical for watermarks and interface elements required to sit cleanly into different backgrounds.
An important thing to remember: converting a JPG to PNG cannot create the background transparent. You will need to cut out the background through a photo editor like Photoshop or GIMP.
Be mindful of when converting JPG to PNG is more info that PNG files are usually larger than their JPG originals. Since PNG uses non-destructive compression storing more image data.
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