Method for adjusting dot-gain for a halftone binary bitmap
A method for adjusting dot-gain for a halftone binary bitmap file, a method for adjusting the dot-gain for a halftone binary print, and a method for adjusting the dot-gain for a printing plate, wherein each method involves inputting a halftone binary bitmap file consisting of binary pixels to a digital filter, then filtering the binary pixels with the digital filter and generating a weighted sum of the pixels, using the weighted sum, producing a multilevel pixel and then comparing the multilevel pixel to a preset level, next a binary pixel output is generated, the output are collected and an adjusted halftone binary bitmap file is formed.
1. A method for adjusting dot-gain for a halftone binary bitmap file comprising:
a) inputting a halftone binary bitmap file consisting of binary pixels to a digital filter,
b) filtering the binary pixels with the digital filter and generating a weighted sum of the pixels;
c) producing a multilevel pixel from the weighted sum;
d) comparing the multilevel pixel to a preset level and generating a binary pixel output; and
e) collecting the binary pixel output and forming an adjusted halftone binary bitmap file.
2. The method of claim 1 , wherein the digital filter is a blur filter, an edge enhancement filter, an averager filter, a high pass filter, a lower pass filter, or a band pass filter.
3. The method of claim 1 , wherein the halftone binary bitmap file is generated by a raster image processor.
4. The method of claim 1 , wherein the halftone binary bitmap file is generated from a high resolution scan of a halftone film.
5. The method of claim 1 , wherein the halftone binary bitmap file is at a resolution of between 600 dpi and 6000 dpi.
6. The method of claim 5 , wherein the halftone binary bitmap file is at a resolution of between 1800 dpi and 3000 dpi.
7. The method of claim 1 , wherein the preset level is determined by the color separation that the halftone binary bitmap file represents.
8. The method of claim 1 , wherein the halftone binary bitmap file will have been processed at a halftone binary bitmap screen ruling and a halftone binary bitmap screen angle.
9. The method of claim 1 , wherein the preset level is determined by a halftone binary bitmap screen ruling.
10. The method of claim 1 , wherein the preset level is determined by a halftone bitmap screen angle.
11. A method for adjusting dot-gain for a halftone binary print comprising the steps of:
a) inputting a halftone binary bitmap file consisting of binary pixels to a digital filter;
b) filtering the binary pixels with the digital filter and generating a weighted sum of the pixels;
c) producing a multilevel pixel from the weighted sum;
d) comparing the multilevel pixel to a preset level and generating a binary pixel output;
e) collecting the binary pixel output and forming an adjusted halftone binary bitmap file; and
f) printing the halftone binary bitmap file.
12. The method of claim 11 , wherein the digital filter is a blur filter, an edge enhancement filter, an averager filter, a high pass filter, a lower pass filter, or a band pass filter.
13. The method of claim 11 , wherein the halftone binary bitmap file is generated by a raster image processor.
14. The method of claim 11 , wherein the halftone binary bitmap file is generated from a high resolution scan of a halftone film.
15. The method of claim 11 , wherein the halftone binary bitmap file is at a resolution of between 600 dpi and 6000 dpi.
16. The method of claim 15 , wherein the halftone binary bitmap file is at a resolution of between 1800 dpi and 3000 dpi.
17. The method of claim 11 , wherein the preset level is determined by the color separation that the halftone binary bitmap file represents.
18. The method of claim 11 , wherein the halftone binary bitmap file will have been processed at a halftone binary bitmap screen ruling and a halftone binary bitmap screen angle.
19. The method of claim 11 , wherein the preset level is determined by a halftone binary bitmap screen ruling.
20. The method of claim 11 , wherein the preset level is determined by a halftone bitmap screen angle.
21. A method for adjusting dot-gain for a printing plate comprising the steps of:
a) inputting a halftone binary bitmap file consisting of binary pixels to a digital filter;
b) filtering the binary pixels with the digital filter generating a weighted sum of the pixels;
c) producing a multilevel pixel from the weighted sum;
d) comparing the multilevel pixel to a preset level and generating a binary pixel output;
e) collecting the binary pixel output and forming an adjusted halftone binary bitmap file; and
f) exposing a printing plate to the adjusted halftone binary bitmap file.
22. The method of claim 21 , wherein the digital filter is a blur filter, an edge enhancement filter, an averager filter, a high pass filter, a lower pass filter, or a band pass filter.
23. The method of claim 21 , wherein the halftone binary bitmap file is generated by a raster image processor.
24. The method of claim 21 , wherein the halftone binary bitmap file is generated from a high resolution scan of a halftone film.
25. The method of claim 21 , wherein the halftone binary bitmap file is at a resolution of between 600 dpi and 6000 dpi.
26. The method of claim 25 , wherein the halftone binary bitmap file is at a resolution of between 1800 dpi and 3000 dpi.
27. The method of claim 21 , wherein the preset level is determined by the color separation that the halftone binary bitmap file represents.
28. The method of claim 21 , wherein the halftone binary bitmap file will have been processed at a halftone bitmap screen ruling and a halftone binary bitmap screen angle.
29. The method of claim 21 , wherein the preset level is determined by a halftone binary bitmap screen ruling.
30. The method of claim 21 , wherein the preset level is determined by a halftone bitmap screen angle.