TIFFCROP

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
SEE ALSO

NAME

tiffcrop − copy, convert, crop, extract, or process a TIFF file

SYNOPSIS

tiffcrop [ options ] src1.tif ... srcN.tif dst.tif

DESCRIPTION

tiffcrop combines one or more files created according to the Tag Image File Format, Revision 6.0 into a single TIFF file. The output file may be compressed using a different algorithm than the input files. tiffcrop is most often used to extract portions of an image for processing with bar code recognizer or OCR software when that software cannot restrict the region of interest to a specific portion of the image or to improve efficiency when the regions of interest must be rotated. It can also be used to subdivide all or part of a processed image into smaller sections.

Functions are applied to the input image in the following order:

cropping, fixed area extraction, zones, inversion, mirroring, rotation.

Functions are applied to the output image in the following order:

output resolution, output margins, rows and columns or page size divisions, orientation options, strip, tile, byte order, and compression options.

By default, tiffcrop will copy all the understood tags in a TIFF directory of an input file to the associated directory in the output file. Options can be used to force the resultant image to be written as strips or tiles of data, respectively.

tiffcrop can be used to reorganize the storage characteristics of data in a file, and to reorganize, extract, rotate, and otherwise process the image data as specified at the same time whereas tiffcp does not alter the image data itself.

OPTIONS

−N odd|even|#,#-#,#|last

Specify one or more series or range(s) of images within file to process. The words odd or even may be used to specify all odd or even numbered images. The word last may be used in place of a number in the sequence to indicate the final image in the file without knowing how many images there are. Ranges of images may be specified with a dash and multiple sets can be indicated by joining them in a comma-separated list. eg. use −N 1,5-7,last to process the 1st, 5th through 7th, and final image in the file.

−E top|bottom|left|right

Specify the top, bottom, left, or right edge as the reference from which to calcuate the width and length of crop regions or sequence of postions for zones. May be abbreviated to first letter.

−U in|cm|px

Specify the type of units to apply to dimensions for margins and crop regions for input and output images. Inches or centimeters are converted to pixels using the resolution unit specified in the TIFF file (which defaults to inches if not specified in the IFD).

−m #,#,#,#

Specify margins to be removed from the input image. The order must be top, left, bottom, right with only commas separating the elements of the list. Margins are scaled according to the current units and removed before any other extractions are computed. Captial M was in use.

	−X #		Set the horizontal (X-axis) dimension of a region to extract relative to the specified origin reference. If the origin is the top or bottom edge, the X axis value will be assumed to start at the left edge.
	−Y #		Set the vertical (Y-axis) dimension of a region to extract relative to the specified origin reference. If the origin is the left or right edge, the Y axis value will be assumed to start at the top.

−Z #:#,#:#

Specify zones of the image designated as position X of Y equal sized portions measured from the reference edge, eg 1:3 would be first third of the image starting from the reference edge minus any margins specified for the confining edges. Multiple zones can be specified as a comma separated list but they must reference the same edge. To extract the top quarter and the bottom third of an image you would use −Z 1:4,3:3.

−F horiz|vert

Flip, ie mirror, the image or extracted region horizontally or vertically.

−R 90|180|270

Rotate the image or extracted region 90, 180, or 270 degrees clockwise.

	−I		Invert the colorspace values for grayscale and bilevel images. This would be used to correct negative images that have incorrect PHOTMETRIC INTERPRETATION tags. No support for color images.
	−H #		Set the horizontal resolution of output images to # expressed in the current units.
	−V #		Set the vertical resolution of the output images to # expressed in the current units.
	−J #		Set the horizontal margin of an output page size to # expressed in the current units.
	−K #		Set the vertical margin of an output page size to # expressed in the current units.

−O portrait|landscape|auto

Set the output orientation of the pages or sections. Auto will use the arrangement that requires the fewest pages.

−S cols:rows

Divide each image into cols across and rows down equal sections.

−P page

Format the output images to fit on page size paper. Use -P list to show the supported page sizes and dimensions.

	−B		Force output to be written with Big-Endian byte order. This option only has an effect when the output file is created or overwritten and not when it is appended to.
	−C		Suppress the use of ‘‘strip chopping’’ when reading images that have a single strip/tile of uncompressed data.
	−c		Specify the compression to use for data written to the output file: none for no compression, packbits for PackBits compression, lzw for Lempel-Ziv & Welch compression, jpeg for baseline JPEG compression, zip for Deflate compression, g3 for CCITT Group 3 (T.4) compression, and g4 for CCITT Group 4 (T.6) compression. By default tiffcrop will compress data according to the value of the Compression tag found in the source file.

The CCITT Group 3 and Group 4 compression algorithms can only be used with bilevel data.

Group 3 compression can be specified together with several T.4-specific options: 1d for 1-dimensional encoding, 2d for 2-dimensional encoding, and fill to force each encoded scanline to be zero-filled so that the terminating EOL code lies on a byte boundary. Group 3-specific options are specified by appending a ‘‘:’’-separated list to the ‘‘g3’’ option; e.g. −c g3:2d:fill to get 2D-encoded data with byte-aligned EOL codes.

LZW compression can be specified together with a predictor value. A predictor value of 2 causes each scanline of the output image to undergo horizontal differencing before it is encoded; a value of 1 forces each scanline to be encoded without differencing. LZW-specific options are specified by appending a ‘‘:’’-separated list to the ‘‘lzw’’ option; e.g. −c lzw:2 for LZW compression with horizontal differencing.

	−f		Specify the bit fill order to use in writing output data. By default, tiffcrop will create a new file with the same fill order as the original. Specifying −f lsb2msb will force data to be written with the FillOrder tag set to LSB2MSB, while −f msb2lsb will force data to be written with the FillOrder tag set to MSB2LSB.
	−i		Ignore non-fatal read errors and continue processing of the input file.
	−l		Specify the length of a tile (in pixels). tiffcrop attempts to set the tile dimensions so that no more than 8 kilobytes of data appear in a tile.
	−L		Force output to be written with Little-Endian byte order. This option only has an effect when the output file is created or overwritten and not when it is appended to.
	−M		Suppress the use of memory-mapped files when reading images.
	−p		Specify the planar configuration to use in writing image data that has more than one 8-bit sample per pixel. By default, tiffcrop will create a new file with the same planar configuration as the original. Specifying −p contig will force data to be written with multi-sample data packed together, while −p separate will force samples to be written in separate planes.
	−r		Specify the number of rows (scanlines) in each strip of data written to the output file. By default (or when value 0 is specified), tiffcrop attempts to set the rows/strip that no more than 8 kilobytes of data appear in a strip. If you specify the special value -1 it will results in infinite number of the rows per strip. The entire image will be the one strip in that case.
	−s		Force the output file to be written with data organized in strips (rather than tiles).
	−t		Force the output file to be written with data organized in tiles (rather than strips).
	−w		Specify the width of a tile (in pixels). tiffcrop attempts to set the tile dimensions so that no more than 8 kilobytes of data appear in a tile. tiffcrop attempts to set the tile dimensions so that no more than 8 kilobytes of data appear in a tile.

−,={character}

substitute {character} for ’,’ in parsing image directory indices in files. This is necessary if filenames contain commas. Note that ’,=’ with whitespace immediately following will disable the special meaning of the ’,’ entirely. See examples.

EXAMPLES

The following concatenates two files and writes the result using LZW encoding:

tiffcrop -c lzw a.tif b.tif result.tif

To convert a G3 1d-encoded TIFF to a single strip of G4-encoded data the following might be used:

tiffcrop -c g4 -r 10000 g3.tif g4.tif

(1000 is just a number that is larger than the number of rows in the source file.)

To extract a selected set of images from a multi-image TIFF file use the -N option described above. Thus, to copy the 1st and 3rd images of image file "album.tif" to "result.tif":

tiffcrop -N 1,3 album.tif result.tif

Invert a bilevel image scan of a microfilmed document and crop off margins of 0.25 inches on the left and right, 0.5 inch on the top, nad 0.75 inch on the bottom. From the remaining portion of the image, select the second and third quarters, ie, one half of the area left from the center to each margin.

tiffcrop -U in -m 0.5,0.25,0.75,0.25 -E left -Z 2:4,3:4 -I MicrofilmNegative.tif MicrofilmPostiveCenter.tif

Extract only the final image of a large Architectural E sized multipage TIFF file and rotate it 90 degrees clockwise while reformatting the output to fit on tabloid sized sheets with one quarter of an inch on each side:

tiffcrop -N last -R 90 -O auto -P tabloid -U in -J 0.25 -K 0.25 -H 300 -V 300 Big-PlatMap.tif BigPlatMap-Tabloid.tif

The output images will have a specified resolution of 300 dpi in both directions. The orientation of each page will be determined by whichever choice requires the fewest pages. To specify a specific orientation, use the portrait or landscape option.