On 2/28/25 17:11, Dave_G0WBX via groups.io wrote:
I've had a play with GIMP on Linux, and I can (to my eye anyway) sharpen things up quite nicely.
But, as yet, I've not hit a file with a schematic!.
Can you tell us which file(s) have schematic diagrams, as their needs are often different to processing text.
I didn't bother with any sharpening; the original scans really aren't too bad. One example of a page in that document that has a schematic is page 20.
I did a quick pass in GIMP on each TIFF file, to determine the most reasonable approach on a per-page basis. Then I threw together a quick script that used ImageMagick to apply those functions per file, concatenate them to a PDF, then do the OCR pass.
Some of those pages would benefit from some manual editing, like cropping, etc, but they're perfectly readable as they are, at least to me, and having the text layer underneath the page image is good.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
Dave McGuire