check is a simple commandline utility to calculate CRC-32 or Adler-32 checksums on the fly (that is, as a filter within a command pipeline), or to calculate such checksums on a list of files given as arguments. It is fast and was designed to be used for verification of backups and archives written to semi-reliable media (e.g., tapes), but it can also be used to compare files against versions stored within ZIP archives (same CRC) or to verify one-to-many copies without the need for multiple byte-for-byte comparisons.
img2pdf is a simple commandline utility to convert a list of PNG, TIFF, or JPEG images to a single PDF document, one image per page. It was designed specifically to convert scanned pages to PDF format, but it will accept images of any aspect ratio and scale them to full page size (which, in general, will not maintain the aspect ratio). The hard work is performed by the Panda PDF library and its dependencies.
png2linuxlogo takes an 80x80 color-mapped (palette-based) PNG of 223 or fewer colors and converts it to a header file suitable for inclusion in the Linux kernel as the full-color boot logo. It does not modify the 16-color or black-and-white boot logos. This allows standard image editing tools such as the GIMP or XPaint to be used to create Linux boot logos. It works with 2.2 and 2.4 kernels.
pngcheck is the official PNG tester and debugger. Originally designed simply to test the CRCs within a PNG image file (e.g., to check for ASCII rather than binary transfer), it has since been extended to check and optionally print almost all the information about a PNG image and to verify that it conforms to the PNG specification. It also includes partial support for MNG animations.
pngquant is a batch conversion utility to quantize and dither truecolor PNG images, especially those with a full alpha channel, down to "RGBA-palette" PNGs (i.e., PLTE + tRNS in PNG parlance). Such images are usually two to four times smaller than the full 32-bit versions, and partial transparency is preserved quite nicely. This makes pngquant especially useful both for Web sites and for PlayStation 2 development, where one of the texture formats is RGBA-palette-based (though not PNG-compressed).
The pnmtopng package contains the official pnmtopng and pngtopnm utilities for use with the rest of the PBMplus/NetPBM suite. They are among the best PNG-supporting applications available, with automatic detection of grayscale or palette images and excellent heuristics for creating the smallest possible PNG images.
These are the demo programs that accompany O'Reilly's "PNG: The Definitive Guide." rpng is a simple file viewer with the ability to set a background color when displaying transparent PNGs. rpng2 is a progressive PNG viewer, designed to work like a web browser (though it contains no network code); it can generate a background image when displaying transparent PNGs. wpng is a simple converter from NetPBM to PNG format; in most respects it is much more limited than pnmtopng, but it supports interactive entry of PNG text annotations and will generate noninterlaced PNGs on the fly (rather than buffering the entire image first like pnmtopng). The viewers include simple front ends for both X and Win32; the converter is a command-line app that compiles on Unix, Windows, and probably other platforms.
This is a simple command-line utilitiy to convert images from TIFF to PNG format. It is primarily useful in dealing with TIFF images that contain alpha channels (transparency information), since the NetPBM suite is (currently) ill-suited for such conversions. A few test images are included.
UnZip will list, test, or extract files from a ZIP archive, commonly found on DOS and Windows systems. A companion program, Zip, creates ZIP archives; both are part of the Info-ZIP project. Both programs are compatible with archives created by PKWARE's PKZIP or Nico Mak's WinZip, but in many cases the program options or default behaviors differ.
The XV "jumbo" patches are a pair of aggregate patches against XV 3.10a, which was last released in December 1994. The first jumbo patch incorporates roughly two dozen bugfixes. The second patch encompasses almost as many enhancements, including support for additional image formats like PNG, PhotoCD, and PDF; performance improvements; and new features such as mouse-wheel support, alpha blending against a background color, and improved dithering for 15/16-bit displays. All patches available from the official XV site are included, as well as numerous other patches from around the world.
Re: problems with colour selection algorithm (Wow, freshmeat's quote-formatting sucketh greatly...) I've looked at your test images in fair detail, and there are at least two issues at...
Re: problems with colour selection algorithm > I noticed that some images converted by > pngquant are lower quality compaired > with the photoshop "save for > web&...
Re: XV back from the dead? (since when did it become uppercase, BTW? If you've paid the registration? :-) I believe XV (the proper noun, not the command name) has always been uppercase in ...
Re: the source .tgz is in a different place > New location: http://www.gzip.org/zlib That is incorrect. The zlib in-memory, deflate/inflate compression library is there (or at http://w...