[Digikam-users] Main window 100% not pixel per pixel

[Micha Neubauer]

Hey Samuel,

is it maybe that you have only "Reduced Size Preview"?
You can change that in
Settings --> Configure Digikam --> Album View
and here under
Misc Options you can set
"Embedded Preview loads full-sized images"

I hope that the answer is that easy...I was wondering as well one day why Gwenview had a 
better resolution ;-)

micha


On Friday 16 July 2010, 21:05:51 Samuel Gilbert wrote:
> Hello,
> 
> Here is the requested info and some tests I did to try to figure out what
> is going on :
> 
> Version 1.3.0
> Using KDE Development Platform 4.4.5 (KDE 4.4.5)
> ArchLinux package : digikam 1.3.0-1
> 
> I don't know if it's relevant, but Kipi-plugins are also version 1.3.0.
> 
> The problem occurs regardless of the image type.  It occurs with all the
> photos I tried :
> 
> Canon Rebel XT JPEG
> Canon Rebel XT RAW (CR2 files)
> JP2 files generated with digiKam's RAW import tool
> Nikon D90 JPEG
> Nikon D90 RAW (NEF files)
> 
> I have some PNG files that are scans of photos taken with my old 35mm
> Camera. The problem does not occur with those files.  It also does not
> occur with the JPEG files generated by my WebCam.
> 
> I noticed that the files for with the zoom works correctly do not have any
> kind of metadata tags (EXIF, IPCT, etc...).  Could it be that digiKam uses
> something in the tags to figure out what is a 100% zoom?  If that is the
> case, what does 100% mean?
> 
> I did the following test to check if digikam is using the image DPI info :
> 
> I selected 50% zoom in the main windows with a JPEG file generated by my
> Canan Rebl XT.  The image has 3456 pixels by 2304 for which the X and Y
> resolution is 72 with the resolution unit set to "Inch".  On screen, the
> display size is 167mm by 112mm.  Once converted to inches, we get
> 6.57480315 by
> 4.40944882.  This mean that we have 3456 for 6.57480315 inches at 50% zoom.
> 
> 3456 px / 6.57480315 inch / 2 (to account for 50% zoom) = 262.82155687
> 
> This does not match the image's DPI.  I also verified that Xorg had the
> correct monitor size prior to the test checking the screen dimensions
> reported by xdpyinfo against the physical display size measured with a
> ruler.
> 
> In the EXIF tags of the image used for the test, there is also the focal
> plane resolution.  Resolution is 3954.23 by 3958.76 with unit set to
> "inch".  Given the image size, this gives a sensor size of 0.874000753623
> by 0.582000424375 inches.  That may be, but I don't understand how it's
> related to the size of the image on screen when a zoom of 100% is
> selected.
> 
> Is there something else I should check?
> 
> Samuel
> 
> On 2010-07-16 Friday 02:02:09 Gilles Caulier wrote:
> > Which digiKam version ?
> > 
> > Which image type ?
> > 
> > Try digiKam 1.3.0
> > 
> > Gilles Caulier
> > 
> > Le 16 juillet 2010 07:16, Samuel Gilbert
> > 
> > <samuel.gilbert at usherbrooke.ca> a écrit :
> > > Hello,
> > > 
> > >  I was wondering if there is a reason why the image isn't displayed
> > >  pixel
> > > 
> > > per pixel when I select 100% in the main window.  If I open the image
> > > in the editor or in another viewer, selecting a zoom of 100% results
> > > in the image being displayed pixel per pixel.  Is this behavior a bug,
> > > or is there something I'm missing?
> > > 
> > > Samuel
> > > _______________________________________________
> > > 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
> 
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