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PPM (Image)

File extension	.ppm
Category	Image File
Description	The portable pixmap format (PPM) is an image format designed to be easily exchanged between platforms which is used by Netpbm - an open-source package of graphics programs and a programming library, used mainly in the Unix world. The format is a lowest common denominator color image file format and is highly inefficient, containing a lot of information the human eye can’t even discern. The precursor to the PPM format was the PBM format which was invented by Jef Poskanzer in the 1980s as a format that allowed monochrome bitmaps to be transmitted within an email message as plain ASCII text, allowing it to survive any changes in text formatting. By the end of 1988, Poskanzer had developed the PGM and PPM formats along with their associated tools and added them to Pbmplus. The final release of Pbmplus was December 10, 1991.
Actions	PPM Converter View other image file formats
Technical Details	A PPM file consists of a sequence of one or more PPM images. There are no data, delimiters, or padding before, after, or between images. Each PPM image consists of the following: A magic number for identifying the file type. A ppm image's magic number is the two characters P6. Whitespace (blanks, TABs, CRs, LFs). A width, formatted as ASCII characters in decimal. Whitespace. A height, again in ASCII decimal 6. Whitespace. The maximum color value (Maxval), again in ASCII decimal. Must be less than 65536 and more than zero. A single whitespace character (usually a newline). A raster of Height rows, in order from top to bottom. Each row consists of Width pixels, in order from left to right. Each pixel is a triplet of red, green, and blue samples, in that order. Each sample is represented in pure binary by either 1 or 2 bytes. If the Maxval is less than 256, it is 1 byte. Otherwise, it is 2 bytes. The most significant byte is first. There is actually another version of the PPM format that is fairly rare: plain PPM format.
Associated programs	Adobe Photoshop Corel Draw GIMP Netpbm
Developed by	Jef Poskanzer
MIME type	image/x-ppm image/x‑portable‑pixmap
Useful links	NetPBM homepage What is the NetPBM format ?

PDF (Document)

File extension	.pdf
Category	Document File
Description	PDF is a file format developed by Adobe Systems for representing documents in a manner that is separate from the original operating system, application or hardware from where it was originally created. A PDF file can be any length, contain any number of fonts and images and is designed to enable the creation and transfer of printer-ready output.
Actions	PDF Converter View other document file formats
Technical Details	Each PDF file encapsulates a complete description of a 2D document (and, with the advent of Acrobat 3D, embedded 3D documents) that includes the text, fonts, images and 2D vector graphics that compose the document. They do not encode information that is specific to the application software, hardware, or operating system used to create or view the document.
Associated programs	Adobe Viewer gPDF Xpdf Ghostview Ghostscript
Developed by	Adobe Systems
MIME type	application/pdf
Useful links	Adobe Reader (to view) Adobe Acrobat (to edit)

Convert PPM file

Using Zamzar, it is possible to convert PPM files to a variety of other formats

ppm to ai (Adobe Illustrator Artwork)
ppm to bmp (Windows bitmap)
ppm to eps (Encapsulated PostScript)
ppm to gif (Compuserve graphics interchange)
ppm to jpg (JPEG compliant image)
ppm to pcx (Paintbrush Bitmap Image)
ppm to pdf (Portable Document Format)
ppm to png (Portable Network Graphic)
ppm to tga (Truevision Targa Graphic)
ppm to tiff (Tagged image file format)
ppm to wbmp (Wireless Bitmap File Format)
ppm to webp (Lossily compressed image file)

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