pngpack.F90 File Reference

This subroutine packs up a data field into PNG image format. More...

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Functions/Subroutines
subroutine	pngpack (fld, width, height, idrstmpl, cpack, lcpack)
	This subroutine packs up a data field into PNG image format. More...

Detailed Description

This subroutine packs up a data field into PNG image format.

Author

Stephen Gilbert

Date

2002-12-21

Definition in file pngpack.F90.

Function/Subroutine Documentation

pngpack()

subroutine pngpack	(	real, dimension(width * height), intent(in)	fld,
		integer, intent(in)	width,
		integer, intent(in)	height,
		integer, dimension(*), intent(inout)	idrstmpl,
		character(len = 1), dimension(*), intent(out)	cpack,
		integer, intent(out)	lcpack
	)

This subroutine packs up a data field into PNG image format.

After the data field is scaled, and the reference value is subtracted out, it is treated as a grayscale image and passed to a PNG encoder. It also fills in GRIB2 Data Representation Template 5.41 or 5.40010 with the appropriate values.

Parameters

[in]	fld	Contains the data values to pack.
[in]	width	number of points in the x direction.
[in]	height	number of points in the y direction.
[in,out]	idrstmpl	Contains the array of values for Data Representation Template 5.2 or 5.3. idrstmpl(1) Reference value - ignored on input. idrstmpl(2) Binary Scale Factor. idrstmpl(3) Decimal Scale Factor. idrstmpl(4) Number of bits containing each grayscale pixel value. idrstmpl(5) Original field type, currently set = 0 on output Data values assumed to be reals. idrstmpl(6) = 0 use lossless compression; = 1 use lossy compression. idrstmpl(7) Desired compression ratio, if idrstmpl(6)=1.
[out]	cpack	The packed data field (character*1 array)
[out]	lcpack	The length of packed field cpack.

Author

Stephen Gilbert

Date

2002-12-21

Definition at line 28 of file pngpack.F90.

References enc_png(), g2_sbytesc(), and mkieee().

Referenced by addfield().