they are lossless...
Lossy
lossless
shush
plane waves in lossy dielectrics
lossless
JPG's not too bad but GIF is terribly lossy
Lossless. Compression techniques do not remove detail from the image.
Lossy= You lose somedata Lossless= You dont
GIF is a lossless compression introduced by CompuServe in 1987 using Lempel-Ziv-Welch (LZW) lossless data compression.
Compression methods are used for images compression and most common compressions are JPEG which is lossy (you can lost some details or quality of image), LZW which is lossless, RLE and ZIP also lossless compressions.
The most common file extensions for image files are: GIF: Old, can be animated, 8-bit color JPEG/JPG: High compression rate, No transparency, lossy PNG: Can be transparent, lossless