[sane-devel] backend Kodak i260 Image depth 48 bits stream. How is coded?

[m. allan noah]

try scanning something with some large sections of solid color in it-
this basically gray photo is hard to work from.

allan

On Sat, Aug 30, 2008 at 3:27 PM,  <jgobuzon-lm at yahoo.com> wrote:
> Thank you Allan
>
>  I was completely lost, but now I have a new course to continue digging.
>
>
> --- El sáb 30-ago-08, m. allan noah <kitno455 at gmail.com> escribió:
>
>> De:: m. allan noah <kitno455 at gmail.com>
>> Asunto: Re: backend Kodak i260 Image depth 48 bits stream. How is coded?
>> A: jgobuzon-lm at yahoo.com
>> Cc: sane-devel at lists.alioth.debian.org, jose.chaves at sat.gob.mx
>> Fecha: sábado, 30 agosto, 2008, 12:48 pm
>> if you look at the taillight in the left image, i think you
>> can see
>> the Cr data. i've not had time to dig anymore.
>>
>> allan
>>
>> On Sat, Aug 30, 2008 at 12:04 PM,
>> <jgobuzon-lm at yahoo.com> wrote:
>> > I'm going to test recode the left ghost image
>> assuming YCbCr and YUV inclusive.
>> >
>> >   YCbCr to RGB
>> >
>> >    R = Y + 1.403*(Cr - 0.5)
>> >    G = Y - 0.344*(Cr - 0.5) - 0.714*(Cb - 0.5)
>> >    B = Y + 1.773*(Cb - 0.5)
>> >
>> >  YUV to RGB
>> >
>> >   R = Y + 1.140V
>> >   G = Y - 0.395U - 0.581V
>> >   B = Y + 2.032U
>> >
>> >  Just to see what will happen.
>> >
>> >
>> > --- El sáb 30-ago-08, m. allan noah
>> <kitno455 at gmail.com> escribió:
>> >
>> >> De:: m. allan noah <kitno455 at gmail.com>
>> >> Asunto: Re: backend Kodak i260 Image depth 48 bits
>> stream. How is coded?
>> >> A: jgobuzon-lm at yahoo.com
>> >> Cc: sane-devel at lists.alioth.debian.org,
>> jose.chaves at sat.gob.mx
>> >> Fecha: sábado, 30 agosto, 2008, 8:17 am
>> >> On Sat, Aug 30, 2008 at 10:09 AM, m. allan noah
>> >> <kitno455 at gmail.com> wrote:
>> >> > i've never used photoshop CS, but i
>> slapped a pnm
>> >> header on top of the
>> >> > raw file saying that it was 8 bit grayscale,
>> 3600 x
>> >> 2200, and i see
>> >> > the car pretty clearly, with some weird
>> stretched
>> >> ghost image on top.
>> >> > the ghost might be some sort of high bit
>> count Y
>> >> channel?
>> >> >
>> >> > allan
>> >> >
>> >>
>> >> or for an even better look, try saying it is 8 bit
>> >> grayscale, with
>> >> 7200 x 1088. you get two very nice views of the
>> car, which
>> >> need to be
>> >> interlaced in some fashion to get the final image.
>> >>
>> >> allan
>> >> --
>> >> "The truth is an offense, but not a sin"
>> >
>> > __________________________________________________
>> > Correo Yahoo!
>> > Espacio para todos tus mensajes, antivirus y antispam
>> ¡gratis!
>> > Regístrate ya - http://correo.yahoo.com.mx/
>> >
>>
>>
>>
>> --
>> "The truth is an offense, but not a sin"
>
> __________________________________________________
> Correo Yahoo!
> Espacio para todos tus mensajes, antivirus y antispam ¡gratis!
> Regístrate ya - http://correo.yahoo.com.mx/
>



-- 
"The truth is an offense, but not a sin"