[magick-users] Memory usage for TIFF images

[Cyril VELTER]

    I'm trying to use imagemagick to view fax images, adn I'm having a
memory consumption problem. When I open a 4 pages fax, 80Mo a memory are
used (even if I set the cache threshold lower).

    Is it a normal behavior ? Im' using 5.5.7 compiled on mingw (same
behavior with the standard win32 5.5.7-Q8)

    Here an identify -verbose of one of my files :

identify -verbose fm51038.tif
TIFF Directory at offset 0x14b4f
  Subfile Type: (0 = 0x0)
  Image Width: 1728 Image Length: 2290
  Resolution: 200, 192 pixels/inch
  Bits/Sample: 1
  Compression Scheme: CCITT Group 3
  Photometric Interpretation: min-is-white
  FillOrder: lsb-to-msb
  Software: "IMageMan by Data Techniques, Inc."
  Samples/Pixel: 1
  Rows/Strip: 2290
  Planar Configuration: single image plane
  Group 3 Options: EOL padding (4 = 0x4)
TIFF Directory at offset 0x28ec2
  Subfile Type: (0 = 0x0)
  Image Width: 1728 Image Length: 2288
  Resolution: 200, 192 pixels/inch
  Bits/Sample: 1
  Compression Scheme: CCITT Group 3
  Photometric Interpretation: min-is-white
  FillOrder: lsb-to-msb
  Software: "IMageMan by Data Techniques, Inc."
  Samples/Pixel: 1
  Rows/Strip: 2288
  Planar Configuration: single image plane
  Group 3 Options: EOL padding (4 = 0x4)
TIFF Directory at offset 0x37587
  Subfile Type: (0 = 0x0)
  Image Width: 1728 Image Length: 2300
  Resolution: 200, 192 pixels/inch
  Bits/Sample: 1
  Compression Scheme: CCITT Group 3
  Photometric Interpretation: min-is-white
  FillOrder: lsb-to-msb
  Software: "IMageMan by Data Techniques, Inc."
  Samples/Pixel: 1
  Rows/Strip: 2300
  Planar Configuration: single image plane
  Group 3 Options: EOL padding (4 = 0x4)
TIFF Directory at offset 0x41035
  Subfile Type: (0 = 0x0)
  Image Width: 1728 Image Length: 2296
  Resolution: 200, 192 pixels/inch
  Bits/Sample: 1
  Compression Scheme: CCITT Group 3
  Photometric Interpretation: min-is-white
  FillOrder: lsb-to-msb
  Software: "IMageMan by Data Techniques, Inc."
  Samples/Pixel: 1
  Rows/Strip: 2296
  Planar Configuration: single image plane
  Group 3 Options: EOL padding (4 = 0x4)
Image: fm51038.tif
  Format: TIFF (Tagged Image File Format)
  Geometry: 1728x2290
  Class: PseudoClass
  Type: bilevel
  Depth: 8 bits-per-pixel component
  Colors: 2
    0: (255,255,255)      grey100
    1: (  0,  0,  0)      black
  Resolution: 200x192 pixels/inch
  Filesize: 260.2kb
  Interlace: None
  Background Color: grey100
  Border Color: #DFDFDF
  Matte Color: grey74
  Dispose: Undefined
  Iterations: 0
  Scene: 0 of 4
  Compression: Fax
  software: IMageMan by Data Techniques, Inc.
  signature:
f971abc7e2884d8d8f3697a1d9f2be5fd54fd80cd660de496abb2c1fbf3f727c
  Tainted: False
  User Time: 1.359u
  Elapsed Time: 0:02
Image: fm51038.tif
  Format: TIFF (Tagged Image File Format)
  Geometry: 1728x2288
  Class: PseudoClass
  Type: bilevel
  Depth: 8 bits-per-pixel component
  Colors: 2
    0: (255,255,255)      grey100
    1: (  0,  0,  0)      black
  Resolution: 200x192 pixels/inch
  Filesize: 260.2kb
  Interlace: None
  Background Color: grey100
  Border Color: #DFDFDF
  Matte Color: grey74
  Dispose: Undefined
  Iterations: 0
  Scene: 1 of 4
  Compression: Fax
  software: IMageMan by Data Techniques, Inc.
  signature:
1808d7a1743aae65a71466271ada5988621907dfc81ca3adc3b58e83468cef23
  Tainted: False
  User Time: 9.125u
  Elapsed Time: 0:11
Image: fm51038.tif
  Format: TIFF (Tagged Image File Format)
  Geometry: 1728x2300
  Class: PseudoClass
  Type: bilevel
  Depth: 8 bits-per-pixel component
  Colors: 2
    0: (255,255,255)      grey100
    1: (  0,  0,  0)      black
  Resolution: 200x192 pixels/inch
  Filesize: 260.2kb
  Interlace: None
  Background Color: grey100
  Border Color: #DFDFDF
  Matte Color: grey74
  Dispose: Undefined
  Iterations: 0
  Scene: 2 of 4
  Compression: Fax
  software: IMageMan by Data Techniques, Inc.
  signature:
9e5093bea5b5469bd85044374f022759522767f95d0ad7fdf46d8f2a5daf0f90
  Tainted: False
  User Time: 16.766u
  Elapsed Time: 0:20
Image: fm51038.tif
  Format: TIFF (Tagged Image File Format)
  Geometry: 1728x2296
  Class: PseudoClass
  Type: bilevel
  Depth: 8 bits-per-pixel component
  Colors: 2
    0: (255,255,255)      grey100
    1: (  0,  0,  0)      black
  Resolution: 200x192 pixels/inch
  Filesize: 260.2kb
  Interlace: None
  Background Color: grey100
  Border Color: #DFDFDF
  Matte Color: grey74
  Dispose: Undefined
  Iterations: 0
  Scene: 3 of 4
  Compression: Fax
  software: IMageMan by Data Techniques, Inc.
  signature:
647d06d1348e7ffa3310338affd04acbd82d9ed20c1a8acfddc18c6f17c3c9a9
  Tainted: False
  User Time: 24.344u
  Elapsed Time: 0:29