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Ignore:
Timestamp:
May 25, 2015, 8:08:57 PM (11 years ago)
Author:
eugene
Message:

adding compression of images in prep for compression / uncompression of tables

File:
1 edited

Legend:

Unmodified
Added
Removed

  • branches/eam_branches/ohana.20150429/src/libfits/doc/notes-compress.txt

    r15487 r38322  
     1
     220150525 :
     3
     4uncompression steps:
     5
     6 * read in a table: gfits_fread_ftable_data (f, &ftable, FALSE); (no byte swap)
     7 * uncompress the image: gfits_uncompress_image (&buf[0].header, &buf[0].matrix, &ftable);
     8   * get ZIMAGE from heaer & delete
     9   * get ZCMPTYPE
     10   * get ZBITPIX, ZNAXIS, ZNAXISnn
     11   * get ZTILEn (if missing ZTILE1 = Nx, others 1)
     12   * get ZNAME, ZVAL
     13   * ZSIMPLE, ZTENSION, ZEXTEND, ZBLOCKED, ZPCOUNT, ZGCOUNT, etc
     14   * ZSCALE, ZBLANK, OBLANK, ZZERO
     15
     16   * data is stored in fits table COMPRESSED_DATA (1PB, 1PI, 1PJ)
     17
     18------------------------------------------------
    119
    220TFORMn : rPt(e_max)
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