Справочник Пользователя для ITT Rule IDL Version 7.0
Chapter 10: Creating a File Writer
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iTool Developer’s Guide
Predefined iTool File Writers
good quality. Lower values of QUALITY produce higher compression ratios and
smaller files.
smaller files.
IDLitWriteJPEG2000
The iTools JPEG2000 file writer uses the IDL WRITE_JPEG2000 procedure to write
compressed images to files. JPEG 2000 is a wavelet-based compression method for
full-color and gray-scale images.
compressed images to files. JPEG 2000 is a wavelet-based compression method for
full-color and gray-scale images.
Registered Properties
N_LAYERS —
An integer specifying the number of quality layers to include.
N_LEVELS —
An integer specifying the number of wavelet decomposition levels.
REVERSIBLE —
A boolean value that specifies whether to use reversible (lossless)
compression.
IDLitWritePICT
The iTools PICT file writer uses the IDL WRITE_PICT procedure to write an image
and its color table vectors to a PICT (version 2) format image file. The PICT format
is used by Apple Macintosh computers.
and its color table vectors to a PICT (version 2) format image file. The PICT format
is used by Apple Macintosh computers.
Registered Properties
None
IDLitWritePNG
The iTools PNG file writer uses the IDL WRITE_PNG procedure to write an image
to a Portable Network Graphics (PNG) file. The data in the file is stored using
lossless compression with either 8 or 16 data bits per channel, based on the input IDL
variable type.
to a Portable Network Graphics (PNG) file. The data in the file is stored using
lossless compression with either 8 or 16 data bits per channel, based on the input IDL
variable type.
Registered Properties
BIT_DEPTH —
Bit depth at which to write the image.
IDLitWriteTIFF
The iTools TIFF file writer uses the IDL WRITE_TIFF procedure to write TIFF files.
Registered Properties
BIT_DEPTH —
Bit depth at which to write the image.
COMPRESSION —
An integer specifying the type of compression to use.