PNG vs TIFF

PNG is a raster graphics file format that supports lossless data compression. PNG supports palette-based images, grayscale images and full-color non-palette-based RGB[A] images. .png format is often used for transferring images on the Internet.

TIFF is a file format for storing images, popular among graphic artists, the publishing industry, and both amateur and professional photographers in general. The TIFF format is widely supported by image-manipulation applications, by publishing and page layout applications.

Summary:
TIFF variant that uses the same compression algorithm as PNG uses.
TIFF offers special-purpose lossless compression algorithms like CCITT Group IV, which can compress bilevel images better than PNG's compression algorithm.
PNG supports non-premultiplied alpha only whereas TIFF also supports "associated" (premultiplied) alpha.

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