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2004.09.14 13:50 "Removing reduced resolution pages", by Han The Man
Hi all, I have about 50.000 TIFF files, some of them having pages with "reduced-resolution" pages. I want to remove any pages in those TIFF files marked as reduced-resolution. So in essence, I want to replace the original file with a new file not having reduced-resolution pages. Can I do that reliably using libtiff? Below is a sample output from TIFFINFO. I know (by visual inspection) that the reduced resolution images are at page 2 and 4. The subfiletype is 0x03 for page 2 and 4, but according to the TIFF 6.0 spec about "Subfiletype", 0x03 means "a single page of a multipage image". Shouldn't TIFFINFO print 0x02 - "reduced-resolution image". What am I missing? Also, how can I best remove reduced-resolution pages from my TIFF files? Best, Han ------ TIFFINFO OUTPUT --- TIFF Directory at offset 0x8 Subfile Type: multi-page document (2 = 0x2) Image Width: 2472 Image Length: 3504 Tile Width: 512 Tile Length: 512 Resolution: 300, 300 pixels/inch Bits/Sample: 1 Compression Scheme: CCITT Group 4 Photometric Interpretation: min-is-white FillOrder: msb-to-lsb Date & Time: "2002:11:11 11:11:11" Image Description: "(removed)" Make: "(removed)" Model: "(removed)" Orientation: row 0 top, col 0 lhs Samples/Pixel: 1 Planar Configuration: single image plane Software: (removed) Tag 34860: (removed) Group 4 Options: (0 = 0x0) TIFF Directory at offset 0x9cec Subfile Type: reduced-resolution image/multi-page document (3 = 0x3) Image Width: 618 Image Length: 876 Tile Width: 512 Tile Length: 512 Resolution: 75, 75 pixels/inch Bits/Sample: 1 Compression Scheme: CCITT Group 4 Photometric Interpretation: min-is-white FillOrder: msb-to-lsb Orientation: row 0 top, col 0 lhs Samples/Pixel: 1 Planar Configuration: single image plane Group 4 Options: (0 = 0x0) TIFF Directory at offset 0xc2e4 Subfile Type: multi-page document (2 = 0x2) Image Width: 2472 Image Length: 3504 Tile Width: 512 Tile Length: 512 Resolution: 300, 300 pixels/inch Bits/Sample: 1 Compression Scheme: CCITT Group 4 Photometric Interpretation: min-is-white FillOrder: msb-to-lsb Date & Time: "2002:11:11 11:11:11" Image Description: "(removed)" Make: "(removed)" Model: "(removed)" Orientation: row 0 top, col 0 lhs Samples/Pixel: 1 Planar Configuration: single image plane Software: (removed) Tag 34860: (removed) Group 4 Options: (0 = 0x0) TIFF Directory at offset 0x11cc0 Subfile Type: reduced-resolution image/multi-page document (3 = 0x3) Image Width: 618 Image Length: 876 Tile Width: 512 Tile Length: 512 Resolution: 75, 75 pixels/inch Bits/Sample: 1 Compression Scheme: CCITT Group 4 Photometric Interpretation: min-is-white FillOrder: msb-to-lsb Orientation: row 0 top, col 0 lhs Samples/Pixel: 1 Planar Configuration: single image plane Group 4 Options: (0 = 0x0)