Garrick Sitongia wrote:
> The brightness and contrast levels are presently not supported by the=20
> sp15c backend. These are presently hardcoded at 128. But I was able to=20
> get it working in the hardware by adding "scanf" statements in sp15c.c.=
=20
> Scanimage stops and I can enter numbers for brightness and contrast eac=
h=20
> time I run scanimage.
>=20
> scanf("%d", &c); /* my code */
> =3D c;
> dev->threshold =3D 128;
> scanf("%d", &c); /* my code */
> dev->contrast =3D c;
>=20
> How instead do I pass these numbers to the backend from scanimage? Wher=
e=20
> scanimage would get them the usual way from command line args?
>=20
> Garrick
>=20
> _________________________________________________________________
> FREE pop-up blocking with the new MSN Toolbar =96 get it now!=20
> http://toolbar.msn.com/go/onm00200415ave/direct/01/
>=20
>=20
It seems that the backend has these options, but they are de-activated al=
most=20
all the time.
In sane_control_option(), see all the lines like
scanner->opt[OPT_BRIGHTNESS].cap =3D SANE_CAP_INACTIVE;
This tells the frontend not to offer the option.
You can change some to
scanner->opt[OPT_BRIGHTNESS].cap &=3D ~SANE_CAP_INACTIVE;
to activate them.
Then, if the option is active, use the value with
dev->brightness =3D scanner->val[OPT_BRIGHTNESS].w;
Hope that helps,
Frank.
