The brightness and contrast levels are presently not supported by the sp15c
backend. These are presently hardcoded at 128. But I was able to get it
working in the hardware by adding "scanf" statements in sp15c.c. Scanimage
stops and I can enter numbers for brightness and contrast each time I run
scanimage.
scanf("%d", &c); /* my code */
dev->brightness = c;
dev->threshold = 128;
scanf("%d", &c); /* my code */
dev->contrast = c;
How instead do I pass these numbers to the backend from scanimage? Where
scanimage would get them the usual way from command line args?
Garrick
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