[softwarelist] Re: Descreening halftone images

In message <7add30fb4f.Ant@xxxxxxxxxxxxxxxxxxxx>, Anthony Hilton <ajh@xxxxxxxxxxxxxxxxx> writes 
David Pilling's TWAIN driver has an option for Superscaling which I
think is aimed at this situation. Does your scanning software offer
any options?
Super scaling consists of the scanner scanning at a high resolution, usually its optical resolution (so 600 dpi would be reasonable) and then passing the results through the same re-size filter as in DPScan (Edit->Resize, Lanczos in Choices->General). In other words you can emulate superscale using just DPScan and bitmaps.
One thing the "super scale" feature is good for is scanning half toned images. So it is a reasonable suggestion.
It was invented because some scanners have such poor interpolation that if you scan half tone images at lower resolutions you get horrible results - in other words scanning your images at a lower resolution might not be a good idea.
Another suggestion would be to use the averaging filters in DPScan (Median, Average, Blur). 

However presumably something like PhotoShop has tools to do this job.


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David Pilling
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