View Window - File | Save As - Save TIFF Options

 

 

Use this dialog to specify output options when saving to a TIFF file format.

 

 

Compression

 

None. Is the most compatible with other applications, and fastest to load.

 

LZW. Is best for 8-bit color and grayscale, and for 24-bit color files.

 

Packbits. Is a very simple and popular variant of RLE (run length encoding) and one of the standard forms of compression available in the TIFF format.

 

Zip. Is an alternative (comparable to LZW but royalty free) non-proprietary compression scheme based on the ZLIB/Deflation stream algorithm.

 

JPEG. The image data is stored in JPEG format within the TIFF file (see JPEG Quality below).

 

CCITT Group 3 and CCITT Grupo 4. Are valid only for bi-level images.

 

Best Fit. Will cause ThumbsPlus to use CCITT Group 4 for any bi-level files, and LZW compression for any others.

 

 

Resolution

 

Enter the desired resolution (Vertical x Horizontal) in units of Dots per inch (DPI) or Dots per centimetre (DPC).

 

Unchanged. (Only available when acquiring images via Image | TWAIN Multiple Acquire and Image | Batch Process) Check this option to leave the resolution unchanged. This options tells ThumbsPlus whether or not to change the resolution setting sent back by the TWAIN driver. Some TWAIN drivers do not always report the actual scanned resolution correctly. If you check the "unchanged" box, the resolution information in the resulting file will be the one reported by the TWAIN driver. If you uncheck this box, the file will be written using the settings entered above.

 

Note: Setting a resolution here has no influence on the scanning process itself nor on the image data written to the file (actual number of pixels present in the image).

 

 

JPEG Quality. For JPEG compressed TIFF (see above), use this field to enter the quality level for compression of the image.

 

Comments. Allows you to edit the contents of the TIFF Description tag.

 

Separate color channels. Allows you to store RGB (Truecolor) images in separate red, green and blue channels.

 

Skim low-order bits. When you select this option for 24-bit images, ThumbsPlus removes two low-order bits from the red and blue channels, and one bit from the green. This often improves the compressibility of the image considerably, while making little if any visual difference.