Today at work someone asked why I sent them a Portable Network Graphics, PNG format screencapture image rather than JPEG.
JPEG rules for photos but try other formats for images with limited colours or large areas of flat colour, like screenshots. For that type of image PNG, even 24 bit, can give better results and much smaller files than jpg. Using Corel PhotoPaint’s export to web to a variety of formats, with the same source, then comparing the results is interesting. The file sizes range from 1.5 to 25 KB and the largest (JPEG) looks nearly as good as the smallest (PNG).
The Portable Network Graphics, PNG, file format was developed as an alternative to the GIF and JPEG file formats. The PNG file format, unlike the GIF file format, supports true colour as well as palette-based images. The PNG file format can also be used to save transparent images (unlike the JPEG file format). PNG files use an advanced lossless compression system and the format supports interlacing.
* It's not ironic that the PNG logo above is .JPG because it’s smaller in that format, try them all then pick the best format for the job!