[sane-devel] Epson Perfection V37/v200 support SANE.

[Camil Băncioiu]

I didn't know to whom should I give my modified "dip_apply_color_profile",
but I'm glad I caught someone's attention. Could this be integrated in the
official driver?

On Wed, Sep 5, 2018 at 4:28 PM Camil Băncioiu <ioan.camil.bancioiu at gmail.com>
wrote:

> Sure, here's the modified "dip_apply_color_profile":
>
> void
> dip_apply_color_profile (const void *self, const buffer *buf,
>                          const double profile[9])
> {
>   SANE_Int i;
>   SANE_Byte *r_buf, *g_buf, *b_buf;
>   double red, grn, blu;
>
>   SANE_Byte *data;
>   SANE_Int size;
>
>   require (dip == self && buf && profile);
>
>   log_info("Using %d bits per channel.", buf->ctx.depth);
>   if (SANE_FRAME_RGB != buf->ctx.format)
>     return;
>
>   log_info("Buffer size: %d", size);
>
>   if (16 == buf->ctx.depth) {
>     uint16_t *p = (uint16_t *) buf->ptr;
>     uint16_t *e = (uint16_t *) buf->end;
>
>     uint16_t red_16, grn_16, blu_16;
>
>     while (p < e)
>     {
>       red_16 = p[0];
>       grn_16 = p[1];
>       blu_16 = p[2];
>       red =
>         profile[0] * (red_16) + profile[1] * (grn_16) + profile[2] *
> (blu_16);
>       grn =
>         profile[3] * (red_16) + profile[4] * (grn_16) + profile[5] *
> (blu_16);
>       blu =
>         profile[6] * (red_16) + profile[7] * (grn_16) + profile[8] *
> (blu_16);
>
>       p[0] = clamp(red, 0, 0xFFFF);
>       p[1] = clamp(grn, 0, 0xFFFF);
>       p[2] = clamp(blu, 0, 0xFFFF);
>       p += 3;
>     }
>   }
>
>   if (8 == buf->ctx.depth) {
>
>     data = buf->ptr;
>     size = buf->end - buf->ptr;
>
>     for (i = 0; i < size / 3; i++) {
>       r_buf = data;
>       g_buf = data + 1;
>       b_buf = data + 2;
>
>       red =
>         profile[0] * (*r_buf) + profile[1] * (*g_buf) + profile[2] *
> (*b_buf);
>       grn =
>         profile[3] * (*r_buf) + profile[4] * (*g_buf) + profile[5] *
> (*b_buf);
>       blu =
>         profile[6] * (*r_buf) + profile[7] * (*g_buf) + profile[8] *
> (*b_buf);
>
>       *data++ = clamp (red, 0, 255);
>       *data++ = clamp (grn, 0, 255);
>       *data++ = clamp (blu, 0, 255);
>     }
>   }
> }
>
> Pay good attention to the compiling process, to ensure that the modified
> driver properly replaces the default iscan driver. I think you had to pass
> some very specific folder paths to the ./configure script (as command-line
> arguments) to match with your system. This was required to make sure that
> the driver finds the proper data files after compilation (the ones provided
> by the iscan-data package).
>
>
> On Tue, Sep 4, 2018 at 7:59 PM Robert A. Schmied <uwppp at flash.net> wrote:
>
>> aloha camil
>>
>> i note your prior message dated 4 aug 18 in which you list function
>> void dip_apply_color_profile of the iscan package -- is this the part
>> you are referring to when you write ".. edit the driver source code .."?
>>
>> regardless, for us casual hackers more specifics as to what to
>> edit/change would be extremely helpful and greatly appreciated.
>>
>>
>> ras
>>
>>
>>
>> Camil Băncioiu wrote:
>> > Unfortunately, on Linux you will not have 16-bit scanning, only 8-bit,
>> if
>> > that is important to you. Scanning at 16-bit can be enabled, but you
>> need
>> > to edit the driver source code and compile it yourself. I have done so.
>> >
>> > On Sun, Sep 2, 2018 at 8:06 PM Yuri Chornoivan <yurchor at ukr.net> wrote:
>> >
>> >
>> >>вівторок, 21 серпня 2018 р. 13:23:51 EEST Виктор Рыжков написано:
>> >>
>> >>>Hello, sane-developers!
>> >>>Help me please. I am work in Vologda State Library.
>> >>>We switched from Windows to ALT Linux, and we had problems with the
>> Epson
>> >>>Perfestion V37/V200 scanners. There are no official Epson drivers on
>> the
>> >>>ALT Linux.SANE does not support them. Do you have the opportunity to
>> help
>> >>>us in this matter?
>> >>>Yours faithfully, engineer of support Viktor Ryzhkov.
>> >>
>> >>Hi,
>> >>
>> >>You can use drivers from the hardware manufacturer:
>> >>
>> >>http://download.ebz.epson.net/dsc/search/01/search/searchModule
>> >>
>> >>Just enter "V37" then download packages for your distribution (ALT is
>> RPM-
>> >>based, you should choose 32- or 64-bits RPM). Install those RPMs.
>> >>Interface is
>> >>very similar to the one for Windows.
>> >>
>> >>Works fine here for Epson Perfection V330 Photo (same family) on Mageia
>> 6,
>> >>64-
>> >>bits.
>> >>
>> >>Hope this helps.
>> >>
>> >>Best regards,
>> >>Yuri
>> >>
>> >>
>> >>
>> >>
>> >>--
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>> >
>> >
>> >
>>
>>
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