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PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...
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.
pdfimages is an open-source command-line utility for lossless extraction of images from PDF files, including JPEG2000 and JBIG2 format when used with option -all. [1] It is freely available as part of poppler-utils and xpdf-utils, and included in many Linux distributions. pdfimages originates from the xpdf package (but now part of poppler-utils).
Composite image showing JPG and PNG image compression. Left side of the image is from a low-quality JPEG image, showing lossy artefacts; the right side is from a PNG image. In information technology , lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data ...
Composite image showing JPG and PNG image compression. Left side of the image is from a JPEG image, showing lossy artefacts; the right side is from a PNG image. In the late 1980s, digital images became more common, and standards for lossless image compression emerged. In the early 1990s, lossy compression methods began to be widely used. [14]
Now here is some info on how to convert PDF image to SVG images. This page covers conversion using free tools. To convert using Adobe Illustrator go to the following two pages: Wikipedia:Graphic Lab/Resources/PDF conversion to SVG/Adobe Illustrator; Wikipedia:Graphic Lab/Images to improve/Archive/Jul 2008#Image:APISmap1.pdf
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Image scaling Changing the picture size of video is known as transsizing, and is used if the output resolution differs from the resolution of the media. On a powerful enough device, image scaling can be done on playback, but it can also be done by re-encoding, particularly as part of transrating (such as a downsampled image requiring a lower ...