This is a question for Cliff Reiter ("Fractals, Visualization and J",
chapter 8, "Image Processing") or anyone else who has worked with
images using J:
How can I change the DPI (dots per inch) resolution of an image with J?
That is, if I have an image with a resolution of 150dpi, how can I
load, process with J, and resave it at, say, 300dpi or even 200dpi for
possibly somewhat improved OCR (text or music) use? (I realize that
the resulting size of the image will be smaller, and that may create
its own issues. However, it is very important for me to know how to
change the resolution data.)
The previous paragraph dealt with SCANNED images. How would this be
done with digital CAMERA images where the image is a given size in
pixels, but there's no specific dots-per-inch specification? In other
words, how can I use J to specify a DPI resolution?
Please note that I am NOT asking for how to resize or resample an
image. Essentially, the pixels should remain untouched, except for the
portion of the data that indicates the number of dots per inch.
Harvey
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