[Digikam-users] My workflow question

Fri Jan 9 23:44:01 GMT 2015

Gentlemen (and any other genders), I understand the format/depth issues.  I just don't seem to be able to take a RAW 
image, convert it to TIFF, and then make sure it's in 16 bit.  I see those 8 to 16 and 16 to 8 options, but nothing more 
in line with Save As XXX Bit Depth.

I did open my MRW in the old dImage Minolta program and it very easily saved it to a 16/48 bit TIFF.  And identified as 
such back in digiKam.

I'm sure this is a DOH! oversight in process that I'm missing!

Paul Verizzo

Message: 5 Date: Fri, 9 Jan 2015 20:36:07 +0100 From: Gilles Caulier <caulier.gilles at gmail.com> To: digiKam - Home 
Manage your photographs as a professional with the power of open source <digikam-users at kde.org> Subject: Re: 
[Digikam-users] What am I missing? (16 bit, etc.) Message-ID: 
<CAHFG6sGrfDhDXi6Bum18Ari2BPZrdAGxhkuTzYsu9ZV8QtOHBg at mail.gmail.com> Content-Type: text/plain; charset=UTF-8 2015-01-09 
20:16 GMT+01:00 Carl McGrath <cmcgrath5035 at comcast.net>:
>> I am fairly certain that JPG (the standard)  is limited to 8 bit x 3
>> channels (RGB)= 24 bit depth.
> JPEG photo => 8 bits
> JPEG medical = 12 bits (pattented and not open source)
>
> digiKam use libjpeg and is limited to 8 bits.
>
>
>> I believe there is a 16 bit TIFF standard, but that may not be universally
>> implemented.
> it's standard. libtiff support 16 bits and more. TIFF support more
> color depth and floating encoding (HDR).
>
> digiKam support 8 and 16 bits in RGBA color space.
>
> PNG support 8 and 16 in RGBA. digiKAm support it too.
>
> JPEG2000 and PGF as similar encoding features than TIFF with wavelets
> compression (that TIFF do not have). 8 and 16 bits are supported by
> digiKam.
>
> Other image format are exotic and do not have any particular interest
> in photography.
>
> For the future we plan to add WebP format support from Google which
> use wavelets compression and 8/16 bits color depth. It's opensource.
>
> I take a look to M$ JPEG-XR (normalized by JPEG group to replace JPEG
> in camera). Yes you read right, to replace JPEG. Read wiki page for
> details : http://en.wikipedia.org/wiki/JPEG_XR
>
> ==> JPEG XR is supported by and "open source" libary from M$ but it's
> a patented solution and M$ ask royalties.
> So, we can forget for a while this format...
>
> Voil?...
>
> Gilles Caulier
>
>
>
>>
>> On 01/08/2015 09:40 PM, Paul Verizzo wrote:
>>
>> I've decided to get out of my comfort zone and start experimenting with 16
>> bit large sRGB color spaces now that I have a new printer with a pretty wide
>> gamut (Canon PRO-100.)
>>
>> So I take an MRW image, select to work in ProPhoto RGB (Why not go all the
>> way?  Been reading about it, especially on Luminous Landscapte.)  I make a
>> few adjustments, such as Levels, then select the 8>16 bit option in Depth.
>> When I try to save it as either JPG or TIFF, the file is kept at 8 bits.
>> When I try a PNG version, it fails.  I'm sorry, I don't have the program up
>> to tell you exactly what the failure message is.
>>
>> I've spent a lot of time in the online help and the Help PDF's, and I can't
>> find anything that specifically address my simple workflow or why it doesn't
>> work.
>>
>> Thanks, Paul
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>>
>>
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> ------------------------------
>
> Message: 6
> Date: Fri, 09 Jan 2015 20:44:57 +0100
> From: jdd <jdd at dodin.org>
> To: digikam-users at kde.org
> Subject: Re: [Digikam-users] What am I missing? (16 bit, etc.)
> Message-ID: <54B02FB9.4080802 at dodin.org>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Le 09/01/2015 20:36, Gilles Caulier a ?crit :
>
>> digiKam use libjpeg and is limited to 8 bits.
> and screens do not display more (not to speak about eyes), so more is
> only good for editing, then 8 bits for display
>
> jdd
>
>
>
> ------------------------------
>
> Message: 7
> Date: Fri, 9 Jan 2015 20:45:54 +0100
> From: Gilles Caulier <caulier.gilles at gmail.com>
> To: digiKam - Home Manage your photographs as a professional with the
> 	power of open source <digikam-users at kde.org>
> Subject: Re: [Digikam-users] What am I missing? (16 bit, etc.)
> Message-ID:
> 	<CAHFG6sHgznHJSVPwcJZENGwiExejB92arLJcPyPTeSLFgkateA at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> 2015-01-09 20:44 GMT+01:00 jdd <jdd at dodin.org>:
>> Le 09/01/2015 20:36, Gilles Caulier a ?crit :
>>
>>> digiKam use libjpeg and is limited to 8 bits.
>>
>> and screens do not display more (not to speak about eyes), so more is only
>> good for editing, then 8 bits for display
>>
>> jdd
>>
>>
>> _______________________________________________
>> Digikam-users mailing list
>> Digikam-users at kde.org
>> https://mail.kde.org/mailman/listinfo/digikam-users
>
> ------------------------------
>
> Message: 8
> Date: Fri, 9 Jan 2015 20:48:11 +0100
> From: Gilles Caulier <caulier.gilles at gmail.com>
> To: digiKam - Home Manage your photographs as a professional with the
> 	power of open source <digikam-users at kde.org>
> Subject: Re: [Digikam-users] What am I missing? (16 bit, etc.)
> Message-ID:
> 	<CAHFG6sF7Bu4nkBrv=T8vYQF1fyYAQ-CaUCaTyweCxy-iJJFCLA at mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> eyes + bran is able to show around 8 billion of colors. No more.
>
> But to perform colors correction without to degrade image quality,
> it's always better to have more color depth to operate. So 16 bits is
> ideally better.
>
> To resume : you change/improve/fix image in 16 bits, you export final
> image in 8 bits.
>
> Gilles Caulier
>
>
> 2015-01-09 20:44 GMT+01:00 jdd <jdd at dodin.org>:
>> Le 09/01/2015 20:36, Gilles Caulier a ?crit :
>>
>>> digiKam use libjpeg and is limited to 8 bits.
>>
>> and screens do not display more (not to speak about eyes), so more is only
>> good for editing, then 8 bits for display
>>
>> jdd
>>
>>
>> _______________________________________________
>> Digikam-users mailing list
>> Digikam-users at kde.org
>> https://mail.kde.org/mailman/listinfo/digikam-users
>
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>
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>
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