COMP

 — 

If Keyword = COMP, then OPT is either ON or OFF (blank is interpreted as OFF). This option allows you to turn PNG file compression ON or OFF. If OPT = ON, then The VAL field is read to determine the degree of compression. See the VALUE argument for acceptable compression values.

ORIENT

 — 

If Keyword = ORIENT, then OPT will determine the orientation of the entire plot. OPT can be either Horizontal (default) or Vertical.

COLOR

 — 

If Keyword = COLOR, then OPT will determine the color depth of the saved file. OPT can be 0, 1, or 2, corresponding to Black and White, Grayscale, and Color (default), respectively.

TMOD

 — 

If Keyword = TMOD, then OPT will determine the text method. OPT can be either 1 or 0, corresponding to bitmap text (default) or line stroke text, respectively.

DEFAULT

 — 

If Keyword = DEFAULT, then all of the default values, for all of the Keyword parameters listed above, are active.

STAT

 — 

Shows the current status of PNG file export.

ON, OFF

 — 

If Keyword = COMP, the values On and Off control the use of compression. The degree of compression is determined by VAL

Horizontal, Vertical

 — 

If Keyword = ORIENT, the terms Horizontal or Vertical determine the orientation of the plot.

0, 1, 2

 — 

If Keyword = COLOR, the numbers 0, 1, and 2 correspond to Black and White, Grayscale and Color, respectively.

1, 0

 — 

If Keyword = TMOD, the values 1 and 0 determine whether bitmap (1) or stroke text (0) fonts will be used

  -1 

 — 

Apply the default, optimum value for compression. This value represents the best combination of speed and compression. It varies according to the release level of the ZLIB compression package.

1-9 

 — 

Use this value to specify a specific compression level. 1 is the lowest compression level (fastest) and 9 is the highest compression level (slowest).