[Digikam-users] What am I doing wrong?

Stuart T Rogers stuart at stella-maris.org.uk
Sat Aug 30 17:47:26 BST 2014

As I suspected my camera is not that bad at compression. My image with 
added watermark from GIMP is 6.2MB against the camera 6.7MB so in my 
view something is going wrong in Digikam. In GIMP I exported the image 
as 100% jpeg. I'll try imagemagik later.


On 30/08/14 15:37, Stuart T Rogers wrote:
> Well what I will do is use both imagemagic and gimp to put a watermark
> on the image and see what file size I get from them. I think you might
> be right but there is certainly still a doubt in my mind about this, not
> sure that a camera would be that poor at compression especially a quite
> recent one.
> Stuart
> On 30/08/14 12:40, Remco Viƫtor wrote:
>> On Saturday 30 August 2014 10:18:40 Stuart T Rogers wrote:
>>> Well not sure how to do this.... the only command used was a watermark
>>> using text and no background at 20% size otherwise all default values
>>> and I renamed them and stored them in the same folder (album). The input
>>> images were standard jpegs from my Pentax K500 and the saved files were
>>> also jpegs. I looked for compression settings on the batch queue manager
>>> but cold not find any. Comparing the images afterwards showed the
>>> renamed ones at about 1.8 or 1.9MB but the same pixel resolution as the
>>> originals which seems to me that somewhere a compression setting of less
>>> than 100% was used but as I say I cannot find anywhere how to set this
>>> for jpegs in the batch queue manager.
>> That helps already.
>> As you manipulate the image by adding the watermark, the image will
>> have to
>> be recompressed on saving. And like was said in a similar thread, a PC
>> has
>> more power than a camera, so it might do a better job at compressing w/o
>> degradation.
>> Also, looking at the images you  provided, I don't see any
>> degradation. So
>> if you agree on that point, there seems to be no problem. Unless,
>> perhaps,
>> when you have to do more editing on the images (but then why put the
>> watermark already...)
>> Remco.
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