[Digikam-users] My workflow question

Sat Jan 10 06:46:18 GMT 2015

I just make the test, and get a 16 bits PNG with my raw file (fuji raw  
file) without having to do anything special...

Did you check in RAW processing settings the "16bits color depth" option ?

Le Sat, 10 Jan 2015 00:44:01 +0100, Paul Verizzo <paulv at paulv.net> a écrit:

> 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
>>> _______________________________________________
>>> Digikam-users mailing list
>>> Digikam-users at kde.org
>>> https://mail.kde.org/mailman/listinfo/digikam-users
>>>
>>>
>>>
>>> _______________________________________________
>>> Digikam-users mailing list
>>> Digikam-users at kde.org
>>> https://mail.kde.org/mailman/listinfo/digikam-users
>>>
>>
>> ------------------------------
>>
>> 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
>>
>> ------------------------------
>>
>> _______________________________________________
>> Digikam-users mailing list
>> Digikam-users at kde.org
>> https://mail.kde.org/mailman/listinfo/digikam-users
>>
>>
>> End of Digikam-users Digest, Vol 116, Issue 11
>> **********************************************
>>
>
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> https://mail.kde.org/mailman/listinfo/digikam-users

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