Daniel Reetz, the founder of the DIY Book Scanner community, has recently started making videos of prototyping and shop tips. If you are tinkering with a book scanner (or any other project) in your home shop, these tips will come in handy. https://www.youtube.com/channel/UCn0gq8 ... g_8K1nfInQ

Is there a way to delete ST-detected picture zones?

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spamsickle
Posts: 596
Joined: 06 Jun 2009, 23:57

Is there a way to delete ST-detected picture zones?

Post by spamsickle » 05 Nov 2010, 07:57

I'm currently processing a textbook which frequently uses the technique of printing large blocks of text with a gray background. I've made an editorial decision that I prefer the black-on-white version of Scan Tailor's output to the black-on-gray version of the original. Sometimes it happens that these pages also contain a black-on-gray section heading, and in those cases I've decided I prefer to keep the original. The easiest way to accomplish this would seem to be to delete the picture zone for the large blocks, but I haven't figured out how to do this.

I can get rid of both of them by flipping the output mode to black and white (assuming there are no real pictures on the page), but I can't subsequently add back only the pictures zones I want ("Picture zones are only available in mixed mode"). If I switch back to mixed mode, Scan Tailor insists on doing its automatic detection of picture zones before letting me have control, and then the only ability I seem to have is the ability to add, not the ability to subtract. I can delete the zones I add, but even if I draw around an automatically detected zone, my ability to delete seems restricted to my redundant overlay, and doesn't affect the original STD zone.

In cases where there are real pictures on the page, black-and-white mode is not really even an option. It is especially troublesome in cases where (due, no doubt, to variations in illumination in my original snapshots) jagged coastlines of black-on-gray "picture" zone appear in the otherwise black-on-white text. The "thinner" and "thicker" slider just seems to control how fat the font is in the black and white zone. I haven't seen any GUI way to modify how Scan Tailor identifies what is picture and what is not. Am I (hopefully) missing something?

ETA: Never mind; I found it. Draw around the unwanted zone, and in the right-click context menu select "properties" rather than delete. This provides the option of subtracting from the auto zone. Thanks!

spamsickle
Posts: 596
Joined: 06 Jun 2009, 23:57

Re: Is there a way to delete ST-detected picture zones?

Post by spamsickle » 05 Nov 2010, 10:31

This does raise another question in my mind, however. I see in the options "Subtract from all layers". How does this option differ from "fill zones"?

Tulon
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Joined: 03 Oct 2009, 06:13
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Re: Is there a way to delete ST-detected picture zones?

Post by Tulon » 05 Nov 2010, 10:43

spamsickle wrote:This does raise another question in my mind, however. I see in the options "Subtract from all layers". How does this option differ from "fill zones"?
This one is a stronger eraser. It can be used to make holes in your manual picture zones.
Scan Tailor experimental doesn't output 96 DPI images. It's just what your software shows when DPI information is missing. Usually what you get is input DPI times the resolution enhancement factor.

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