54 lines
2.3 KiB
Plaintext
54 lines
2.3 KiB
Plaintext
See the main README file for basic instructions on compiling and running
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the programs. See http://www.cdrom.com/pub/png/pngbook.html for further
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information and links to the source code, and Chapters 13-15 of the book
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for detailed discussion of the three programs.
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Since the two viewers, rpng and rpng2, are both designed to write infor-
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mation to the console (i.e., a DOS-window command line) while displaying
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the image in a graphical window--and since I haven't yet figured out how
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to do that under Windows--here are the usage screens for the two programs:
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rpng-win 1.02 of 19 March 2000: Simple PNG Viewer for Windows
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Compiled with libpng 1.0.5; using libpng 1.0.5.
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Compiled with zlib 1.1.3; using zlib 1.1.3.
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Usage: rpng-win [-gamma exp] [-bgcolor bg] file.png
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exp transfer-function exponent (``gamma'') of the display
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system in floating-point format (e.g., ``2.2''); equal
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to the product of the lookup-table exponent (varies)
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and the CRT exponent (usually 2.2); must be positive
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bg desired background color in 7-character hex RGB format
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(e.g., ``#ff7f00'' for orange: same as HTML colors);
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used with transparent images
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Press Q, Esc or mouse button 1 after image is displayed to quit.
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rpng2-win 1.04 of 19 March 2000: Progressive PNG Viewer for Windows
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Compiled with libpng 1.0.5; using libpng 1.0.5.
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Compiled with zlib 1.1.3; using zlib 1.1.3.
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Usage: rpng2-win [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing] file.png
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exp transfer-function exponent (``gamma'') of the display
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system in floating-point format (e.g., ``2.2''); equal
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to the product of the lookup-table exponent (varies)
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and the CRT exponent (usually 2.2); must be positive
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bg desired background color in 7-character hex RGB format
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(e.g., ``#ff7f00'' for orange: same as HTML colors);
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used with transparent images; overrides -bgpat
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pat desired background pattern number (1-16); used with
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transparent images; overrides -bgcolor
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-timing enables delay for every block read, to simulate modem
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download of image (~36 Kbps)
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Press Q, Esc or mouse button 1 after image is displayed to quit.
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The usage screen for the third (non-windowed) program, wpng, can be seen
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simply by invoking it without any parameters (``wpng'').
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Greg Roelofs
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19 March 2000
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