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TIFF Files With Halftone Setting Print Low Qu
DocumentID: 607901
Revision Date: 29-Feb-96 1:32:32 PM

The information in this document applies to:
WordPerfect® 5.1 for DOS

Problem

Solutions: Problem 1:
The customer is importing TIFF files from a Mars 105 Handscanner. This scanner can export in Lineart Mode and two different Halftone settings. The resolution on the Halftone settings is much better than the Lineart when printed outside of WordPerfect. However, the Halftone exports are poor quality when printed from WP. The LINEART.TIF file comes in OK, but the resolution is poor.

Problem 2:
The customer added some text to a TIFF file using CorelDRAW, and then resaved the TIFF file. When the user prints the file at high quality, all the text prints. When they print the file at draft or medium quality, parts of the text are missing. The TIFF file is autosized in WordPerfect and was saved at 300 DPI.

Answer 1:
If any scaling is done to half toned images, some of the quality of the image will be lost. To overcome this problem WPCorp recommends that images be scanned in as gray shaded images. By doing this, none of the image information is lost and WP can then scale the image to what the user wishes, and then do the half toning as the image is printed.

If the images cannot be scanned in using gray shades, the user must be very careful not to have WP scale the image. Normally this is done very easily by sizing the image using the Auto Size option in Figure Edit. This will force the image box to be the size it was when scanned. This works very well on TIFF images that give us all the information that WP needs and the information that is given is correct.

The problem is that the TIFF images being talked about were created as 1 dot per inch images. This is obviously wrong because that would make the images around 800" x 951" in size. Looking at them closely, they probably were created at 300 dots per inch, which would make the image around 2.67" x 3.17" inches, which prints out very nicely. When the information in the TIFF file is bad, WP makes a good guess. On these TIFF files, WP guessed wrong.

Answer 2:
The text was drawn using a dot pattern instead of being solid black. When WordPerfect is rasterizing the image for draft or medium quality, it has to remove some of the bits in the file because draft and medium print at lower DPI settings. The customer should set the text to solid black or print at high quality. Also, the customer could export the image directly from CorelDRAW without the extra steps. Also, the user could trace the TIFF image from the scanner and make it a vector file which would print with better quality.

Answer:

Details:


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