dither function when convert color PDF page to black and white TIFF file

Hi we are having a problem converting the attached PDFs using the "asp_PDFToImageConverter2" method. Following are our parameters:

X Resolution: 200
Y Resolution: 200
Bitcount: 1
Grayscale: False
Compression: 4
Quality: 100

The attached zip files contains the source PDFs. The issue is that the resulting TIFF is deteriorated.
===========================
"asp_PDFToImageConverter2" method can convert your 001000000.pdf file to attached TIFF file, because your 001000000.pdf file contain color information, so "asp_PDFToImageConverter2" method will dither the colors in BW TIFF file, is this the problem that you point to? Do you wish disable the "dither" processing?

Also, we suggest you may use at least 600DPI when you need convert a color PDF file to BW TIFF file, then you will get a BW TIFF file at better quality.

VeryPDF
===========================
Yes, how do we disable dither processing, and will these affect other images that get processed. In other words, is this a setting that we can always have ON (to remove dither)? Thank you.
===========================
We have disabled the "dither" in the new version to you, please download the new version from following URL to try again,

XXXXXXXXXXXX

VeryPDF
===========================
Some information about Dithered Colors or Halftone technology:
===========================
Dithering, also named Halftoning or Color Reduction, is going to be the technique of rendering an image on a display device with fewer colors than are in the images. The quantity of different colors in an image or on a device is employed referred to as its Color Resolution. The term 'resolution' indicates 'fineness' and is employed to describe the level of detail in a digitally sampled signal. It actually is used most generally in referring towards the Spatial Resolution, which might be the fundamental sampling rate for digitized images. To give the look of a good deal more colors, and this is especially accurate of early monitors that could only display 16 pure colors, a approach named dithering was used to give the impression of a great deal far more colors. Once you create an image or text images which will contain an invisible background color, make the background color exactly exactly the same as your net web site (which need to have to be a Web Safe color). Or, pick a Web Safe color that comes quite close to your background color or background texture. The reason for this is when your application creates the internet image, typically it'll anti-alias (blend) the edge of the visible image towards the background color. In case you use a white background, by way of example, and your net site has a red brown background, you could see an annoying light colored fringe about your image. Making use of a World wide web Secure color, on the other hand, ought to produce a cleaner image. It truly is essential to emphasize here that dithering can be a one-way operation. When an image has been dithered, even though it could look like a superb reproduction with the original, information is permanently lost. Quite a few image processing functions fail on dithered images. For these factors, dithering ought to be regarded as only as a technique to produce an image on hardware at would otherwise be incapable of displaying it. The details representing an image ought to usually be kept in full detail.
======================================
In printing, a continuous tone image, for example a photograph, that has been converted into a black-and-white image. Halftones are designed by way of a method referred to as dithering, in which the density and pattern of black and white dots are varied to simulate diverse shades of gray.
======================================
A halftone image is produced up of a series of dots as opposed to a continuous tone. These dots might be various sizes, various colors, and occasionally even different shapes. Bigger dots are utilized to represent darker, much more dense locations with the image, whilst smaller dots are used for lighter places.

Halftone images use used in newspapers and magazines since it really is a a lot much more efficient strategy to print images. Considering that a halftone image is produced up of discreet dots, it demands considerably much less ink to print than a continuous tone image. As long as the resolution of the image (measured in LPI) is high sufficient, the dots appear as a continuous image to the human eye. Nevertheless, should you closely examine the images printed in a newspaper, you ought to be capable of see the dots that make up the halftone image.
======================================

VN:F [1.9.20_1166]
Rating: 5.0/10 (2 votes cast)
VN:F [1.9.20_1166]
Rating: 0 (from 0 votes)
dither function when convert color PDF page to black and white TIFF file, 5.0 out of 10 based on 2 ratings

Related Posts

Leave a Reply

Your email address will not be published. Required fields are marked *


Verify Code   If you cannot see the CheckCode image,please refresh the page again!