I have a photograph of a document with black text on a white background.
The photo has some problems:
- The text is a bit vague.
- Overall, there is noise even in the white areas.
- The background does not appear really white but a little yellowish.
- Most important: Some areas of the image, even the areas supposed to be white, are darker than others.
I would like to clean this photo. I'm on Linux.
The "Colors> Auto> White Balance" filter in GIMP gives promising results. However, it does not match the background in different areas of the image.
But if I only select one sub-area of the image, the "White Balance" filter actually works better in that area.
So I imagine that the progressive application of "White Balance" in the local areas of the image would work really well.
I imagine that the "White Balance" filter is implemented like this:
- Collect color statistics of the entire image.
- Create a color conversion matrix and apply it globally.
So what I would rather like:
- Collect local color statistics for each area, e.g. 100 * 100 px.
- Create local color conversion matrices.
- Create a continuous function of pixel conversion matrices.
- Apply locally per pixel.
Do you know anything like that that exists either in GIMP or as standalone software, for example for the Linux command line?
I process all files from a document library. I need to get the file and its metadata. It's relatively simple. But for each file, I would also like to get the name of the document set in which it is located, if any. I see a lot of advice for getting all the files in one set of documents, but nothing the other way around. Can anyone help?
There is an attachment and a list of data. I want to display the view of the attachments and the possibility to mark the verified data in this list. (for small screen)