To save disk space and quickly transmit TIFF images, you can compress images using the compression function. You can use the following methods of compressing and decompressing the types of images shown in parentheses:
CCITT Group 3 (Bitonal images)
CCITT Group 4 (Bitonal images)
LZW (Bitonal, Gray scale, Palette, RGB, and YCbCr images)
Packbits (Gray Scale, Palette, Bitonal images)
JPEG (Gray Scale, RGB, and YCbCr images)
The following compression types are defined in the BITIFFLib.enumCompressionTypes enum:
|
Compression mode |
Description |
|
TCOMP_NOCOMP (= 201) |
No compression |
|
TCOMP_PACKBITS (= 202) |
Packbit |
|
TCOMP_LZW (= 203) |
LZW |
|
TCOMP_LZW_DIFF (= 204) |
LZW with differentiation |
|
TCOMP_CCITTG2 (= 205) |
CCITT Group 3 1D NO EOL |
|
TCOMP_CCITTG31D (= 206) |
CCITT Group 3 1D |
|
TCOMP_CCITTG32D (= 207) |
CCITT Group 3 2D |
|
TCOMP_CCITTG4 (= 208) |
CCITT Group 4 |
|
TCOMP_JPEG (= 209) |
JPEG |
For color images the following flags can also be specified using a binary OR operation with one of the compression flags:
|
TSPEC_16BIT (= 256) |
Save the image in 16 bit grayscale format . |
|
TSPEC_12IN16BIT (= 512) |
Save the image in 12 bit grayscale format. |
|
TSPEC_CMYK (= 768) |
Save the image as a CMYK image. |
|
TSPEC_YCBCR (= 1024) |
Save the image as a YCBCR image. |