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

[cerp]

mmmm .... there seems to be quite some degradation .... the camera is  
a recent professional grade camera, with up to date firmware. Standard  
software like silkypix or lighzone do not seem to affect the size of  
the files  .... it does not seem to be the case.


Quoting HaJo Schatz <hajo at hajo.net>:

> I'm guessing -- and only guessing -- that the cam might have limited
> processing power and hence doesn't compress the JPEG as well as is
> possible. The PC might have far more computing power and hence produce a
> way smaller file (through better compression, not by degredation of
> quality). What happened if you converted the 4.8MB file to say a PNG?
>
> On Thursday, August 28, 2014, cerp <cerp at eeos.biz> 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
>>>>>>>>
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>>>>>>>>
>>>>>>>>
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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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>
>
> --
> --
> Sent from my mobile device, apologies for typos
>
> PGP key: http://tinyurl.com/neswujo