PNG to JPG: What Changes During Conversion?
PNG is a lossless image format that can store transparency. JPG normally uses lossy compression and does not support an alpha transparency channel in the same way. Converting PNG to JPG therefore involves more than changing a file extension.
Transparency
If the source PNG has a transparent background, the conversion needs a background color. Transparent areas are commonly rendered against white or another chosen color before JPG encoding.
File size
Photographic images can become much smaller as JPG because lossy compression removes information that is less noticeable to the eye. The best quality setting depends on the intended use.
Quality checks
- Inspect text and sharp edges.
- Check transparent areas after conversion.
- Compare the output dimensions.
- Choose a suitable JPG quality level.