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2. Netpbm - Wikipedia

   en.wikipedia.org/wiki/Netpbm

   Filesize reduction factor 100 or so when converting to png is typical if the image is a line drawing; if the image is a photo, it is best converted to jpeg, which yields a greater filesize reduction. The PPM format is generally an intermediate format used for image work before converting to a more efficient format, for example the PNG format ...

3. libpng - Wikipedia

   en.wikipedia.org/wiki/Libpng

   libpng is the official Portable Network Graphics (PNG) reference library (originally called pnglib). It is a platform-independent library that contains C functions for handling PNG images. It supports almost all of PNG's features, is extensible, and has been widely used and tested for over 28 years.

4. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   The PNG (Portable Network Graphics) file format was created as a free, open-source alternative to GIF. The PNG file format supports 8-bit (256 colors) paletted images (with optional transparency for all palette colors) and 24-bit truecolor (16 million colors) or 48-bit truecolor with and without alpha channel – while GIF supports only 8-bit ...

5. Comparison of graphics file formats - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_graphics...

   Portable Network Graphics World Wide Web Consortium.png image/png General purpose Yes PNM: Portable Anymap File Format ASCII.pnm image/x-portable-anymap Yes PostScript: page description/scripting language, levels 1–3 Adobe.ps, .ps2, .ps3 printing/publishing industry standard format PPM: Portable Pixmap File Format ASCII.ppm image/x-portable ...

6. Poppler (software) - Wikipedia

   en.wikipedia.org/wiki/Poppler_(software)

   Poppler is a free and open-source software library for rendering Portable Document Format (PDF) documents. Its development is supported by freedesktop.org . Commonly used on Linux systems, [ 3 ] it powers the PDF viewers of the GNOME and KDE desktop environments .

7. ExifTool - Wikipedia

   en.wikipedia.org/wiki/ExifTool

   ExifTool is a free and open-source software program for reading, writing, and manipulating image, audio, video, and PDF metadata.As such, ExifTool classes as a tag editor.It is platform independent, available as both a Perl library (Image::ExifTool) and a command-line application.