Jim Crow laws were state and local laws enforcing racial segregation in the Southern United States. Enacted after the Reconstruction period, these laws continued in force until 1965.he Jim Crow laws and the high rate of lynchings in the South were major factors in the Great Migration during the first half of the 20th century. Because opportunities were so limited in the South, African Americans moved in great numbers to northern cities to seek better lives, becoming an urbanized population.
PNG was designed for transferring images on the Internet, not for professional-quality print graphics, and therefore does not support non-RGB color spaces such as CMYK. PNG files nearly always use file extension PNG or png and are assigned MIME media type image/png.
When to Use PNG. Use PNG when you need smaller file sizes with no loss in quality. PNG files are usually smaller than TIFFs, in my experience. PNG also supports alpha transparency (soft edges) and was developed to be a Web graphics replacement for GIF. Note that if you want to retain full transparency, you will need to save your PNG file as PNG-24 and not PNG-8. PNG-8 is useful for reducing the file size of PNG files when you don't need transparency, but it has the same color palette limitations as GIF files.