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2. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   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 pdf2swf component converts PDF to SWF. Scribus: GNU GPL: Yes Open source program for page ...

3. Chubb illusion - Wikipedia

   en.wikipedia.org/wiki/Chubb_illusion

   The Chubb illusion is similar to another visual illusion, the contrast effect.The contrast effect is an illusion in which the perceived brightness or luminance of an identical central visual target form on a larger uniform background varies to the test subject depending on the ratio of the central form's luminance to that of its background. [4]

4. Reverse-contrast typefaces - Wikipedia

   en.wikipedia.org/wiki/Reverse-contrast_typefaces

   Peter Biľak's Karloff is a family of normal and matching reverse-contrast fonts with upper- and lower-case, together with a low-contrast slab serif design, all with the same basic structure. Biľak and his colleagues tried to strictly invert the contrast of a conventional Didone font and interpolate the two for the low-contrast slab serif.

5. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   JPXDecode, a lossy or lossless filter based on the JPEG 2000 standard, introduced in PDF 1.5. Normally all image content in a PDF is embedded in the file. But PDF allows image data to be stored in external files by the use of external streams or Alternate Images. Standardized subsets of PDF, including PDF/A and PDF/X, prohibit these features.

6. Histogram equalization - Wikipedia

   en.wikipedia.org/wiki/Histogram_equalization

   This allows for areas of lower local contrast to gain a higher contrast. Histogram equalization accomplishes this by effectively spreading out the highly populated intensity values which are used to degrade image contrast. The method is useful in images with backgrounds and foregrounds that are both bright or both dark. In particular, the ...

7. Tone mapping - Wikipedia

   en.wikipedia.org/wiki/Tone_mapping

   Tone mapped high-dynamic-range (HDR) image of St. Kentigerns Roman Catholic Church in Blackpool, Lancashire, England, UK. Tone mapping is a technique used in image processing and computer graphics to map one set of colors to another to approximate the appearance of high-dynamic-range (HDR) images in a medium that has a more limited dynamic range.