JPG is the most popular image format, but it has one significant drawback: it cannot allow alpha channel. Whenever you need a graphic to sit on a colored background without an ugly white box, you require PNG format.
Changing JPG to PNG is a straightforward task, however knowing when this is the right choice will save you time and eliminate extra storage waste.
The most common purpose to convert JPG to PNG is to gain access to PNG's alpha channel. Very important for watermarks and interface elements which must sit cleanly into different backgrounds.
An important thing to remember: changing a JPG to PNG does not automatically make the alpha channel. You will need to cut out the background using an image editing tool such as Photoshop or GIMP.
One thing to be aware of during conversion of JPG to PNG is that PNG files are almost always heavier than their JPG equivalents. This is because PNG applies lossless compression that stores all pixel data.
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