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2. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   PDF 2.0 defines 256-bit AES encryption as the standard for PDF 2.0 files. The PDF Reference also defines ways that third parties can define their own encryption systems for PDF. PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2.

3. Wikipedia : Public domain image resources

   en.wikipedia.org/wiki/Wikipedia:Public_domain...

   Metadata about the images and the books from which they come is also available for download on Github. Pixnio – A large collection of high resolution public domain images. Free for personal and commercial use, no attribution required. Devostock.com – Over 160,000 free professional images for commercial use.

4. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Modular PDF software. Solid Converter PDF: Proprietary: Yes Yes Yes PDF to Word, Excel, HTML and Text; supports passwords, text editing, and batch conversion. SWFTools: GNU GPL: Yes Yes Yes Yes SWF conversion and manipulation suite containing a standalone PDF to SWF converter along with a Python gfx API (requires Xpdf).

5. Image conversion - Wikipedia

   en.wikipedia.org/wiki/Image_conversion

   Like any resampling operation, changing image size and bit depth are lossy in all cases of downsampling, such as 30-bit to 24-bit or 24-bit to 8-bit palette-based images.. While increasing bit depth is usually lossless, increasing image size can introduce aliasing or other undesired artifa

6. PNG - Wikipedia

   en.wikipedia.org/wiki/PNG

   The JPEG (Joint Photographic Experts Group) format can produce a smaller file than PNG for photographic (and photo-like) images, since JPEG uses a lossy encoding method specifically designed for photographic image data, which is typically dominated by soft, low-contrast transitions, and an amount of noise or similar irregular structures.

7. File:Mona Lisa, by Leonardo da Vinci, from C2RMF retouched.jpg

   en.wikipedia.org/wiki/File:Mona_Lisa,_by...

   If you have a different image of similar quality, be sure to upload it using the proper free license tag, add it to a relevant article, and nominate it. This image was selected as picture of the day on the English Wikipedia for October 22, 2013 .