TIFF

Description

Tagged image file format, one of the most widely supported file formats for storing bit-mapped images on personal computers (both PCs and Macintosh computers).

Import Library

im8tif.dil

Export Library

im8xtif.del

Remarks

Supports reading and writing 1 bit, 4, 8, and 24 bit color, CMYK, black and white and grayscale multipage and single page images. The supported compression types include Packbits and LZW for color, Modified CCITT, and CCITT Group 3 and Group 4 Fax for b/w only.

Attributes

Read and Write

Name

DataType

Notes

EXTENSION

OPTBLK_STRING

"TIF"

ARTIST

OPTBLK_STRING

NULL terminated string of variable length

SOFTWARE

OPTBLK_STRING

NULL terminated string of variable length

COPYRIGHT

OPTBLK_STRING

NULL terminated string of variable length

DESCRIPTION

OPTBLK_STRING

NULL terminated string of variable length

TITLE

OPTBLK_STRING

NULL terminated string of variable length

COMPRESS

OPTBLK_BOOL

If set to false, will be overridden it TIFF_COMPRESS is defined

TIFF_COMPRESS

OPTBLK_STRING

OPTBLK_COPY_IFSAMECOLOR

Compression Options

This specifies what compression method to use on bi-level images. Colors images are only compressed using the LZW compression method. The PACKBITS compression is a simple run length encoding method with moderate compression. The MODCCITT compression uses Huffman encoding to perform good compression. The GROUP3 option is the CCITT Group 3 Fax compression and yields the same compression ratios as the MODCCITT compression. GROUP4 is the CCITT Group 4 fax compression standard, and provides the best compression ratio.

The default compression is PACKBITS for bi-level images and color images, unless you have a license agreement with UNISYS. In that case the default compression for color images is LZW.

TIFF_ROWSPERSTRIP

OPTBLK_INT32

OPTBLK_COPY_IFSAMESIZE

Range from 1 to image height

This specifies the number of image lines that should be written in each strip of a TIFF image. By default ImageMan will create strips about 8K in length which is the recommended size. Normally you would not need to change this option.

TIFF_FILLORDER

OPTBLK_INT32

Controls whether bits in a byte are written LSB->MSB (1) or MSB->LSB (2)

This specifies that the bits in a byte should be written in reverse order. This is often required for files that are to be faxed.

TIFF_NEWSUBFILETYPE

OPTBLK_INT32

This specifies the value of the NEWSUBFILETYPE tag that is written in the file. The default value is 0, which is appropriate for most files. A value of 2, which indicates the file is part of a multi-page document, is required for some fax files.

TIFF_BYTEFORMAT

OPTBLK_STRING

"MOTOROLA" | "INTEL"(default) Motorola or Intel byte ordering

TIFF_COLORMODEL

OPTBLK_INT32

OPTBLK_COPY_IFSAMECOLOR

This specifies the color model used when writing the image data. The default is RGB.

Value

Description

0

white is zero

1

black is zero

2

RGB

3

RGB Palette

4

Transparency Mask

5

CMYK

6

YCbCr (unsupported)

7

CIELab (unsupported)

TIFF_TAG_%d

ANYTYPE

OPTBLK_DELAYED_LOAD

May use any type and possibly an array of any type where %d is the tag number

Write Only

TIFF_XRES

OPTBLK_INT32

This specifies the xresolution of the TIFF image. XResolution by default will get and set info from DIB header

TIFF_YRES

OPTBLK_INT32

This specifies the xresolution of the TIFF image. YResolution by default will get and set info from DIB header

TIFF_PAGES

OPTBLK_INT32

Total pages in file (write only) exposed in Imageman properties

This specifies the number of pages that will be written in the file and causes the PAGENUMBER tag to be added to the file. This tag is generally used for fax files and some fax programs require this tag to be present in files to be faxed. You must specify this tag for each page of the file to be written and the value must equal the total number of pages that will be in the file. We do not validate this value so if the number doesn't equal the number of pages in the file other software may not be able to process the file correctly.

SOURCE

OPTBLK_STRING

Maps to SOFTWARE

AUTHOR

OPTBLK_STRING

Maps to ARTIST

COMMENT

OPTBLK_STRING

Maps to DESCRIPTION

DOCUMENT

OPTBLK_STRING

Maps to TITLE

Name	DataType	Notes
EXTENSION	OPTBLK_STRING	"TIF"
ARTIST	OPTBLK_STRING	NULL terminated string of variable length
SOFTWARE	OPTBLK_STRING	NULL terminated string of variable length
COPYRIGHT	OPTBLK_STRING	NULL terminated string of variable length
DESCRIPTION	OPTBLK_STRING	NULL terminated string of variable length
TITLE	OPTBLK_STRING	NULL terminated string of variable length
COMPRESS	OPTBLK_BOOL	If set to false, will be overridden it TIFF_COMPRESS is defined
TIFF_COMPRESS	OPTBLK_STRING	OPTBLK_COPY_IFSAMECOLOR

TIFF_BYTEFORMAT	OPTBLK_STRING	"MOTOROLA" \| "INTEL"(default) Motorola or Intel byte ordering
TIFF_COLORMODEL	OPTBLK_INT32	OPTBLK_COPY_IFSAMECOLOR

Value	Description
0	white is zero
1	black is zero
2	RGB
3	RGB Palette
4	Transparency Mask
5	CMYK
6	YCbCr (unsupported)
7	CIELab (unsupported)

SOURCE	OPTBLK_STRING	Maps to SOFTWARE
AUTHOR	OPTBLK_STRING	Maps to ARTIST
COMMENT	OPTBLK_STRING	Maps to DESCRIPTION
DOCUMENT	OPTBLK_STRING	Maps to TITLE