JPEG is the most widely used image format, but it has one significant limitation: it does not allow alpha channel. Whenever you need a graphic to display on a patterned canvas without white borders, you require PNG format.
Converting JPG to PNG is a easy operation, however knowing when this is the right choice can save effort and prevent unneeded file bloat.
The most common motivation to change JPG to PNG is to enable transparency support. This is critical for watermarks and interface elements which must blend seamlessly over any background.
Something important to understand: changing a JPG to PNG does not produce the clear background. You still need to remove the background through a photo editor such as Photoshop or GIMP.
Something to be aware of during conversion of JPG to PNG is that PNG files are typically larger than their JPG here originals. This is because PNG employs lossless compression that stores all pixel data.
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