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2. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Utility library for rendering Portable Document Format (PDF) documents. poppler-utils includes command-line tools to extract images from a PDF (pdfimages) and convert a PDF to other formats (pdftohtml, pdftotext, pdftoppm). ps2pdf: GNU AGPL: Yes Part of Ghostscript; converts a PostScript file to a PDF. SWFTools: GNU GPL: Yes

3. Hemispherical photography - Wikipedia

   en.wikipedia.org/wiki/Hemispherical_photography

   Hemispherical photograph used to study microclimate of winter roosting habitat at the Monarch Butterfly Biosphere Reserve, Mexico.. Hemispherical photography, also known as canopy photography, is a technique to estimate solar radiation and characterize plant canopy geometry using photographs taken looking upward through an extreme wide-angle lens or a fisheye lens (Rich 1990).

4. File:Oculus photographed in fisheye by Victor Grigas ...

   en.wikipedia.org/wiki/File:Oculus_photographed...

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

5. Fisheye lens - Wikipedia

   en.wikipedia.org/wiki/Fisheye_lens

   For the popular 35 mm film format, typical focal lengths of fisheye lenses are 8–10 mm for circular images, and 12–18 mm for diagonal images filling the entire frame. For digital cameras using smaller imagers such as 1/4 in and 1/3 in format CCD or CMOS sensors, the focal length of "miniature" fisheye lenses can be as short as 1–2 mm .

6. Image conversion - Wikipedia

   en.wikipedia.org/wiki/Image_conversion

   RAW is not a standardized format, in fact, RAW-formats even differ between camera models from the same vendor [citation needed]. Data in a RAW-file is structured according to the Bayer filter's pattern in cameras that use a single image sensor. Debayering, the process of obtaining bitmap data from a RAW-image is always a lossy operation.

7. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.