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Hi all,

I need to scan some old films using a 48 bits color depth (in order to keep
the quality after some graphical process).
My Canon CS5200F does it well but none of my graphical softwares can handle
48 bits picture.

The GIMP 2.6.2 translated my pictures from 48 to 24 bits.
IrfanView does the same as the GIMP (48 => 24).
I also tried XnView which is supposed to handle 48 bits pictures but when
the picture is transfered from the scanner, I get a black screen (I tried
in 24 bits and got the correct picture so this is really a color depth
problem).

I heard that the GIMP 2.6.2 was using a module called GECL which handles 48
bits pictures but I did not find any to configure/activate it : my pictures
are always handled as 24 bits picture.

I do not want to buy any graphical software because many free ones exist.

=> Do you know any free software or plugin which could work with 48 bits
pictures acquired from a scanner ?

Thanks in advance for your help.

In article <XnF9B58B8F97AF34guista@212.27.60.38>, Guilbert STABILO
<(E-Mail Removed)> wrote:

> => Do you know any free software or plugin which could work with 48 bits
> pictures acquired from a scanner ?

try the 30 day free trial of adobe photoshop cs4.

On 16 Nov 2008 17:11:01 GMT, Guilbert STABILO <(E-Mail Removed)>
wrote:

>Hi all,
>
>I need to scan some old films using a 48 bits color depth (in order to keep
>the quality after some graphical process).
>My Canon CS5200F does it well but none of my graphical softwares can handle
>48 bits picture.
>
>The GIMP 2.6.2 translated my pictures from 48 to 24 bits.
>IrfanView does the same as the GIMP (48 => 24).
>I also tried XnView which is supposed to handle 48 bits pictures but when
>the picture is transfered from the scanner, I get a black screen (I tried
>in 24 bits and got the correct picture so this is really a color depth
>problem).
>
>I heard that the GIMP 2.6.2 was using a module called GECL which handles 48
>bits pictures but I did not find any to configure/activate it : my pictures
>are always handled as 24 bits picture.
>
>I do not want to buy any graphical software because many free ones exist.
>
>=> Do you know any free software or plugin which could work with 48 bits
>pictures acquired from a scanner ?
>
>Thanks in advance for your help.

While not free, it's relatively inexpensive. Photoline www.photoline.com From
what I recall the free demo doesn't really expire nor cripple itself, you just
get a longer nag screen after 30 days.

If you save your scans in CMYK format then it will even properly handle 64-bit
color-depths. It's the only software that I know of that can do this. PhotoShop
still only uses 16-bit math for most of its tools and functions. Wholly
incapable of retaining all that extra data during any processing of these larger
bit-depths. This has been a thorn in the side of the "pro" world for the last 2
decades of using PhotoShop, but they all seem to ignore it and live with it.
Only recently has Adobe started to add in some 32-bit math routines to only some
of their tools and features, but by no means do all PhotoShop tools and filters
use 32-bit math. They're still working on it. Photoline has been a fully 32-bit
math platform for the last 15 years.

Sorry, wrong link.

Photoline is at www.pl32.net




On 16 Nov 2008 17:11:01 GMT, Guilbert STABILO <(E-Mail Removed)>
wrote:

>Hi all,
>
>I need to scan some old films using a 48 bits color depth (in order to keep
>the quality after some graphical process).
>My Canon CS5200F does it well but none of my graphical softwares can handle
>48 bits picture.
>
>The GIMP 2.6.2 translated my pictures from 48 to 24 bits.
>IrfanView does the same as the GIMP (48 => 24).
>I also tried XnView which is supposed to handle 48 bits pictures but when
>the picture is transfered from the scanner, I get a black screen (I tried
>in 24 bits and got the correct picture so this is really a color depth
>problem).
>
>I heard that the GIMP 2.6.2 was using a module called GECL which handles 48
>bits pictures but I did not find any to configure/activate it : my pictures
>are always handled as 24 bits picture.
>
>I do not want to buy any graphical software because many free ones exist.
>
>=> Do you know any free software or plugin which could work with 48 bits
>pictures acquired from a scanner ?
>
>Thanks in advance for your help.

While not free, it's relatively inexpensive. Photoline www.photoline.com From
what I recall the free demo doesn't really expire nor cripple itself, you just
get a longer nag screen after 30 days.

If you save your scans in CMYK format then it will even properly handle 64-bit
color-depths. It's the only software that I know of that can do this. PhotoShop
still only uses 16-bit math for most of its tools and functions. Wholly
incapable of retaining all that extra data during any processing of these larger
bit-depths. This has been a thorn in the side of the "pro" world for the last 2
decades of using PhotoShop, but they all seem to ignore it and live with it.
Only recently has Adobe started to add in some 32-bit math routines to only some
of their tools and features, but by no means do all PhotoShop tools and filters
use 32-bit math. They're still working on it. Photoline has been a fully 32-bit
math platform for the last 15 years.

In article <(E-Mail Removed)>, NeilMolon
<(E-Mail Removed)> wrote:

> I guess that's why everyone is raving about CS4 finally supporting some 32-bit
> math in some of its functions.

actually they're raving about cs4 being *64 bit*.

In article <Xns9B58985DA2298ReplyScoreID@216.168.3.30>, HEMI-Powered
<(E-Mail Removed)> wrote:

> mark, my computer math is pretty rusty but what does 16 bit
> floating point or whatever vs. 32 bit or even 64 bit have anything
> at all to do with color depth?

it doesn't. photoshop uses 32 bit math internally (or 64 bit in cs4)
when making calculations on an 8 bit per channel image.

In article <Xns9B589AD147AFAReplyScoreID@216.168.3.30>, HEMI-Powered
<(E-Mail Removed)> wrote:

> >> mark, my computer math is pretty rusty but what does 16 bit
> >> floating point or whatever vs. 32 bit or even 64 bit have
> >> anything at all to do with color depth?
> >
> > it doesn't. photoshop uses 32 bit math internally (or 64 bit
> > in cs4) when making calculations on an 8 bit per channel
> > image.
>
> so, what does the bit width of the math to do with color depth at
> all? if I understand your answer, nothing.

basically, speed.

nospam <(E-Mail Removed)> wrote:
> NeilMolon

>> I guess that's why everyone is raving about CS4 finally supporting some 32-bit
>> math in some of its functions.
>
>actually they're raving about cs4 being *64 bit*.

Too many people with too little understanding.

32-bit pixels is different from being able to handle a 64-bit address
space. Whining that PS cn't do 32-bit pixels for all functions is
silly given that there's no output device that can handle even a
16-bit range.

--
Ray Fischer
(E-Mail Removed)

In article <49209181$0$33596$(E-Mail Removed)>, Ray Fischer
<(E-Mail Removed)> wrote:

> 32-bit pixels is different from being able to handle a 64-bit address
> space.

right.

> Whining that PS cn't do 32-bit pixels for all functions is
> silly given that there's no output device that can handle even a
> 16-bit range.

16 bit printing is supported on cs4/mac.

On 16 Nov 2008 17:11:01 GMT, Guilbert STABILO
<(E-Mail Removed)> wrote:

>Hi all,
>
>I need to scan some old films using a 48 bits color depth (in order to keep
>the quality after some graphical process).
>My Canon CS5200F does it well but none of my graphical softwares can handle
>48 bits picture.
>
>The GIMP 2.6.2 translated my pictures from 48 to 24 bits.
>IrfanView does the same as the GIMP (48 => 24).
>I also tried XnView which is supposed to handle 48 bits pictures but when
>the picture is transfered from the scanner, I get a black screen (I tried
>in 24 bits and got the correct picture so this is really a color depth
>problem).
>
>I heard that the GIMP 2.6.2 was using a module called GECL which handles 48
>bits pictures but I did not find any to configure/activate it : my pictures
>are always handled as 24 bits picture.
>
>I do not want to buy any graphical software because many free ones exist.
>
>=> Do you know any free software or plugin which could work with 48 bits
>pictures acquired from a scanner ?
>
>Thanks in advance for your help.

It's not free but Photo Paint will handle 48 bit RGB.



Eric Stevens