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2. pngcrush - Wikipedia

   en.wikipedia.org/wiki/Pngcrush

   The main purpose of pngcrush is to reduce the size of the PNG IDAT data stream by trying various combinations of compression methods and delta filters. It can also be used for various manipulations of PNG images, such as changing the bit depth , removing unwanted ancillary chunks , or adding certain chunks including gAMA, tRNS, iCCP, and ...

3. PNG - Wikipedia

   en.wikipedia.org/wiki/PNG

   Portable Network Graphics (PNG, officially pronounced / p ɪ ŋ / [3] [4] PING, colloquially pronounced / ˌ p iː ɛ n ˈ dʒ iː / [5] PEE-en-JEE) is a raster-graphics file format that supports lossless data compression. [6] PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF)—unofficially, the ...

4. Free Lossless Image Format - Wikipedia

   en.wikipedia.org/wiki/Free_Lossless_Image_Format

   The format supports an optional alpha channel like PNG (but unlike JPEG); and progressive coding, similar to PNG (unlike it, progressive compression doesn't increase file-size), but as FLIF's algorithm is more complex (and partly, may not have had as much tuning of the implementation yet), it has a higher computational cost; at least lower ...

5. WebP - Wikipedia

   en.wikipedia.org/wiki/WebP

   WebP's lossy compression algorithm is based on the intra-frame coding of the VP8 video format [24] and the Resource Interchange File Format (RIFF) as a container format. [4] As such, it is a block-based transformation scheme with eight bits of color depth and a luminance–chrominance model with chroma subsampling by a ratio of 1:2 ( YCbCr 4:2: ...

6. PDF24 Creator - Wikipedia

   en.wikipedia.org/wiki/PDF24_Creator

   PDF encryption, decryption and signing; Change PDF information (author, title, etc.) Compress and shrink PDF files; Add a watermark or stamp a PDF file; Combine pages with a digital paper; Convert to and from PDF; Multiple PDF printers for different purposes since 7.7.0; Full featured and lightweight PDF reader since version 8.7.0

7. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   Lossy compression algorithms preserve a representation of the original uncompressed image that may appear to be a perfect copy, but is not a perfect copy. Often lossy compression is able to achieve smaller file sizes than lossless compression. Most lossy compression algorithms allow for variable compression that trades image quality for file size.