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

[m. allan noah]

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