Changeset 38441 for trunk/Ohana/src/libfits/doc/notes-compress.txt

Timestamp:

Jun 12, 2015, 6:18:23 PM (11 years ago)

Author:

eugene

Message:

merge changes from EAM dev branch ohana.20150429

Location:

trunk/Ohana

Files:

• . (modified) (1 prop)
• src/libfits/doc/notes-compress.txt (modified) (1 diff)

trunk/Ohana/src/libfits/doc/notes-compress.txt

@@ +1 @@
+
+20150525 : 
+
+uncompression steps:
+
+ * read in a table: gfits_fread_ftable_data (f, &ftable, FALSE); (no byte swap)
+ * uncompress the image: gfits_uncompress_image (&buf[0].header, &buf[0].matrix, &ftable);
+   * get ZIMAGE from heaer & delete
+   * get ZCMPTYPE 
+   * get ZBITPIX, ZNAXIS, ZNAXISnn
+   * get ZTILEn (if missing ZTILE1 = Nx, others 1)
+   * get ZNAME, ZVAL
+   * ZSIMPLE, ZTENSION, ZEXTEND, ZBLOCKED, ZPCOUNT, ZGCOUNT, etc
+   * ZSCALE, ZBLANK, OBLANK, ZZERO
+
+   * data is stored in fits table COMPRESSED_DATA (1PB, 1PI, 1PJ)
+
+------------------------------------------------
 
 TFORMn : rPt(e_max)