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Main window 100% not pixel per pixel

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Samuel Gilbert

Main window 100% not pixel per pixel

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
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Gilles Caulier-4

Re: Main window 100% not pixel per pixel

Which digiKam version ?

Which image type ?

Try digiKam 1.3.0

Gilles Caulier

Le 16 juillet 2010 07:16, Samuel Gilbert
<[hidden email]> 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
> [hidden email]
> https://mail.kde.org/mailman/listinfo/digikam-users
>

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Rei Shinozuka

Re: Main window 100% not pixel per pixel

In reply to this post by Samuel Gilbert

is the image file RAW? if so, digikam might be displaying a scaled
preview image embedded in the RAW file.

-rei

On 07/16/2010 01:16 AM, Samuel Gilbert wrote:

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Samuel Gilbert

Re: Main window 100% not pixel per pixel

In reply to this post by Gilles Caulier-4

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
>
> <[hidden email]> 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
> > [hidden email]
> > https://mail.kde.org/mailman/listinfo/digikam-users
>
> _______________________________________________
> Digikam-users mailing list
> [hidden email]
> https://mail.kde.org/mailman/listinfo/digikam-users

_______________________________________________
Digikam-users mailing list
[hidden email]
https://mail.kde.org/mailman/listinfo/digikam-users

Micha Neubauer

Re: Main window 100% not pixel per pixel

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
> >
> > <[hidden email]> 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
> > > [hidden email]
> > > https://mail.kde.org/mailman/listinfo/digikam-users
> >
> > _______________________________________________
> > Digikam-users mailing list
> > [hidden email]
> > https://mail.kde.org/mailman/listinfo/digikam-users
>
> _______________________________________________
> Digikam-users mailing list
> [hidden email]
> https://mail.kde.org/mailman/listinfo/digikam-users

___________________________________________________________
Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de
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Samuel Gilbert

Re: Main window 100% not pixel per pixel

Hi Micha,

This solved my problem. Thank you very much! Merci beaucoup!

Samuel

On 2010-07-16 Friday 18:16:55 Micha Neubauer wrote:

> 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
> > >
> > > <[hidden email]> 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
> > > > [hidden email]
> > > > https://mail.kde.org/mailman/listinfo/digikam-users
> > >
> > > _______________________________________________
> > > Digikam-users mailing list
> > > [hidden email]
> > > https://mail.kde.org/mailman/listinfo/digikam-users
> >
> > _______________________________________________
> > Digikam-users mailing list
> > [hidden email]
> > https://mail.kde.org/mailman/listinfo/digikam-users
>
> ___________________________________________________________
> Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de
> _______________________________________________
> Digikam-users mailing list
> [hidden email]
> https://mail.kde.org/mailman/listinfo/digikam-users

_______________________________________________
Digikam-users mailing list
[hidden email]
https://mail.kde.org/mailman/listinfo/digikam-users