GRAPHICS_EXAMPLES_CONVERT
Sample Data for Graphics Demonstrations

GRAPHICS_EXAMPLES_CONVERT, scripts which illustrate how various kinds of graphical data can be processed by the ImageMagick program CONVERT and its related tools.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

GRAPHICS_EXAMPLES programs are available in a C version and a C++ version and a dataset version and a FORTRAN77 version and a FORTRAN90 version and a MATHEMATICA version and a MATLAB version.

Related Software and Data:

GRAPHICS_EXAMPLES_DISLIN, examples which illustrate how various kinds of data can be displayed and analyzed graphically using the graphics library dislin();

GRAPHICS_EXAMPLES_GNUPLOT, examples which illustrate how various kinds of data can be displayed and analyzed graphically using the interactive executable graphics program gnuplot().

GRAPHICS_EXAMPLES_GRACE, examples which illustrate how various kinds of data can be displayed and analyzed graphically using the interactive executable graphics program grace().

GRAPHICS_EXAMPLES_OCTAVE, examples which illustrate how various kinds of data can be displayed and analyzed graphically, using the interactive executable graphics program octave().

GRAPHICS_EXAMPLES_PLOTLY1, examples which illustrate how various kinds of data can be displayed and analyzed graphically, using the plotly() program (version 1) from a browser.

Reference:

1. Michael Still,
   The Definitive Guide to ImageMagick,
   Apress, 2005,
   ISBN13: 978-1590595909.

Examples and Tests:

APPEND shows how 6 plots in 6 files can be combined into a single plot. We will place the plots in two rows and three columns.

• cc_d3_level0.png, plot 0.
• cc_d3_level1.png, plot 1.
• cc_d3_level2.png, plot 2.
• cc_d3_level3.png, plot 3.
• cc_d3_level4.png, plot 4.
• cc_d3_level5.png, plot 5.
• append_script.sh, commands that combine plots 0, 1 and 2 into cc_d3_level012.png, plots 3, 4 and 5 into cc_d3_level345.png, and then combines these two images into one.
• cc_d3_level012345.png, a plot containing the 6 images in two rows and three columns.

MAGNIFY shows how a plot can be increased in size by sampling. Typically, sampling is used to reduce the size of a plot, but the same procedure can be used to increase the size. Sampling does not do interpolation, which means that no new colors are introduced into the output plot. This can be important for a black and white image, for instance, since many scaling procedures will create an enlarged image that contains shades of gray. Because I am doing an exact 8-fold multiplication of the image, I don't expect any surprises!

• bw_99x99.png, a 99x99 black and white image. I want this to be 8 times bigger (on a side), and I don't want any gray!
• bw_792x792_sample.png, the bigger plot, using sampling. (I like it. No gray!)
• bw_792x792_resize.png, the bigger plot, using resize and pixel sizes. (I don't like it. There's obvious grays.)
• bw_792x792_percent.png, the bigger plot, using resize and a percentage. (I don't like it. There's obvious grays.)
• magnify_script.sh, commands that combine use the sample and resize commands to magnify the image.

You can go up one level to the EXAMPLES directory.