The commands jpegtran -optimize a.jpg >b.jpg You can modify JPEG images using jpegtran.
The tool reduced the file size of an image by almost 70 percent in our lab. The optipng image.png call optimizes PNGs (e.g., by reducing the color depth or providing higher compression). For example, the exiftool -comment="" image.jpgĬommand writes a comment in the picture's Exif metadata. Alternatively, you can add more metadata. The exiftool -all= image.jpgĬommand deletes all unwanted metadata, which could prove to be useful if you want to post pictures online. With exiftool -list you can view the tool's capabilities exiftool image.jpg outputs the Exif metadata contained in the file. The metadata includes, among other things, the type of camera used, the capture date, and the GPS coordinates and serial number of the camera under certain circumstances. The ExifTool program outputs the Exif metadata from images and modifies them as required. Steghide and OutGuess – hide information in images using steganography.jpegtran – performs lossless modifications on JPEGs.OptiPNG and PNG Crush – optimize and reduce PNGs.Other Programsīesides the two top dogs, with their wide range of functions, some additional command-line programs exist with very specific skills.
The options in the parentheses ensure that the GCC compiler uses the correct flags and libraries. To compile the source code, use the command: $ gcc myconvert.c -omyconvert $(GraphicsMagickWand-config \ The example in Listing 9 only converts between different graphic formats (e.g., from GIF to PNG) and doesn't take advantage of the countless options of the original Image- and GraphicsMagick programs.
0 kommentar(er)
