[Digikam-users] How to stop "watermark" reducing the size of the pictures?

[Jan Wolter]

An adding the "Convert To JPEG" tool to the end of the queue does not 
have a positive impact on the quality as well?

On 28.08.2014 18:28, cerp wrote:
> 4896 x 3264 before and after editing. It is just the quality and size 
> (in Mb) that is reduced.
>
>
> Quoting Jan Wolter <jan.wolter at uni-paderborn.de>:
>
>> What size in terms of pixels in x and y dimension has the picture 
>> before and after editing?
>>
>> On 08/28/2014 03:17 PM, cerp wrote:
>>>
>>> There seems to be a reduction of quality.
>>>
>>> Why, what are you thinking of?
>>>
>>> Best
>>>
>>>
>>> Quoting HaJo Schatz <hajo at hajo.net>:
>>>
>>>> Is there really a loss of quality or only a reduction of size?
>>>>
>>>> On Thursday, August 28, 2014, cerp <cerp at eeos.biz> wrote:
>>>>
>>>>> No, digikam still reduces the pictures from 4.8Mb to 1.8 Mb, with the
>>>>> consequent loss of quality / details. It happens not only when I 
>>>>> apply
>>>>> watermark but any other batch tool.
>>>>>
>>>>> Quoting Jan Wolter <jan.wolter at uni-paderborn.de>:
>>>>>
>>>>> Yes, thats true. Does this settings have a positive impact to the 
>>>>> quality
>>>>>> of your edited pictures?
>>>>>>
>>>>>> On 08/28/2014 12:11 PM, cerp wrote:
>>>>>>
>>>>>>>
>>>>>>> Dear Jan,
>>>>>>>
>>>>>>> I have set JPEG quality = 100 and chroma sub sampling = none, that
>>>>>>> should be maximum quality correct?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Quoting Jan Wolter <jan.wolter at uni-paderborn.de>:
>>>>>>>
>>>>>>> Hello,
>>>>>>>>
>>>>>>>> I guess that your images are generally (independent from the added
>>>>>>>> watermark) not saved with maximal quality. Check your settings 
>>>>>>>> under menu
>>>>>>>> Settings -> Configure digiKam -> Saving Images.
>>>>>>>>
>>>>>>>> Best regards,
>>>>>>>> Jan
>>>>>>>>
>>>>>>>> On 08/28/2014 09:43 AM, cerp wrote:
>>>>>>>>
>>>>>>>>> Dear all,
>>>>>>>>>
>>>>>>>>> We use the watermark function to add the copyright in the 
>>>>>>>>> bottom right
>>>>>>>>> corner of the pictures.
>>>>>>>>>
>>>>>>>>> The pictures are taken using in camera jpeg generation, which 
>>>>>>>>> normally
>>>>>>>>> has very high quality.
>>>>>>>>>
>>>>>>>>> When we watermark in digikam, it reduces the size of the jpeg 
>>>>>>>>> file
>>>>>>>>> from approximately 4Mb to 1.8Mb with a considerable loss of 
>>>>>>>>> quality. We
>>>>>>>>> have tried setting all the parameters we could think, but 
>>>>>>>>> without being
>>>>>>>>> able to stop this behavior. What I would like is the original 
>>>>>>>>> picture with
>>>>>>>>> the watermark saved at the same resolution without additional 
>>>>>>>>> compression
>>>>>>>>> .... how do I achieve it?
>>>>>>>>>
>>>>>>>>> Thanks for your help.
>>>>>>>>>
>>>>>>>>> Regards
>>>>>>>>>
>>>>>>>>> Corrado & Rina
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> r
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> 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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>>>>>>
>>>>>
>>>>>
>>>>>
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>>>>>
>>>>
>>>>
>>>> -- 
>>>> -- 
>>>> Sent from my mobile device, apologies for typos
>>>>
>>>> PGP key: http://tinyurl.com/neswujo
>>>
>>>
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>>
>> -- 
>> ----------------------------------------------------------------
>>  Jan Wolter, M.Sc.        | e-mail: jan.wolter at uni-paderborn.de
>>  Universitaet Paderborn   | http://ag-kastens.cs.upb.de/jwolter
>>  Fakultaet EIM/Informatik | Office: F2.303
>>  Fuerstenallee 11         | Phone:  +49 5251 606683
>>  33102 Paderborn, Germany | Fax:    +49 5251 606697
>> ----------------------------------------------------------------
>>
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>
>
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-- 
----------------------------------------------------------------
  Jan Wolter, M.Sc.        | e-mail: jan.wolter at uni-paderborn.de
  Universitaet Paderborn   | http://ag-kastens.cs.upb.de/jwolter
  Fakultaet EIM/Informatik | Office: F2.303
  Fuerstenallee 11         | Phone:  +49 5251 606683
  33102 Paderborn, Germany | Fax:    +49 5251 606697
----------------------------------------------------------------