[digikam] [Bug 342513] New: [PATCH] Add support for fractional radius in blur and unsharp mask filters

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[digikam] [Bug 342513] New: [PATCH] Add support for fractional radius in blur and unsharp mask filters

pochini
https://bugs.kde.org/show_bug.cgi?id=342513

            Bug ID: 342513
           Summary: [PATCH] Add support for fractional radius in blur and
                    unsharp mask filters
           Product: digikam
           Version: 4.5.0
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: Image Editor
          Assignee: [hidden email]
          Reporter: [hidden email]

Currently the blur filter accepts and interger value for the radius parameter.
This unfortunate because it does not allow the user to blur an image slightly.
The blur filter is also used by the unsharp mask filter, so it has the same
problem, too.
The attached patch adds support for fractional radius to the blur filter and,
consequently, to the unsharp mask filter.
Just like the current version the blur kernel is a square. I was about to write
a generic convolution filter, but it would have resulted in a much slower code
for (probably) only a small advantage in quality.

* NOTES:
- Beta and RFC: please ignore debug code.
- It's slower than the current version.
- The effective radius is d->radius/10, which I don't like a lot. I'd prefer to
make d->radius a float and to make the code pass the actual radius in place of
10*r. Both the blur and umask GUI code have to be changed.
- 8-bits images are converted to 16 bits in order to avoid rounding issues.

* Known bugs:
- It does not take into account sRGB colorspace non-linearity (e.g.: averaging
a black (0) and white (255) pixel should result in a middle gray (187) value,
but it returns 127 instead).
- The approximation bug of the radius value has yet to be addressed (sometimes
1.0 is passed as 9). It's actually a GUI bug and I'll file another report
later.


Reproducible: Always

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[digikam] [Bug 342513] [PATCH] Add support for fractional radius in blur and unsharp mask filters

pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #1 from [hidden email] ---
Created attachment 90227
  --> https://bugs.kde.org/attachment.cgi?id=90227&action=edit
Blur filter enhancement

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Gilles Caulier-4
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[hidden email]
            Summary|[PATCH] Add support for     |Add support for fractional
                   |fractional radius in blur   |radius in blur and unsharp
                   |and unsharp mask filters    |mask filters [patch]

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Maik Qualmann
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

Maik Qualmann <[hidden email]> changed:

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                 CC|                            |[hidden email]

--- Comment #2 from Maik Qualmann <[hidden email]> ---
Created attachment 90332
  --> https://bugs.kde.org/attachment.cgi?id=90332&action=edit
blurtest.png

Hi pochini,

I also think this should be a double value of the radius. You seem to
understand a lot of the blur kernel, maybe you could enhance it further? I once
created a test image. Left image is from digiKam and right image is from Gimp
or Krita. Look on the mouth.

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

pochini
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #3 from [hidden email] ---
(In reply to Maik Qualmann from comment #2)
> Created attachment 90332 [details]
> blurtest.png
>
> Hi pochini,
>
> I also think this should be a double value of the radius. You seem to
> understand a lot of the blur kernel

Not really...


> maybe you could enhance it further? I
> once created a test image. Left image is from digiKam and right image is
> from Gimp or Krita. Look on the mouth.

Yes, most likely it is due the square kernel. Gimp and other programs feature a
gaussian blur filter instead that produces a much more pleasing "bokeh" (and
less artifacts that are not visible in your example). I can write a generic
convolution filter that can approximate the gaussian filter. It will be a lot
slower, though.
I think the blur filter in Digikam is useless. I never had the need to blur a
photo... quite the opposite. I enhanced it because it is used internally by the
unsharp mask filter and the integer-only radius does not allow the user (me :))
) to set the radius small enough. IMO radius>=1 is too large in most cases
because it creates halo artifacts around sharp edges.
If you think a good blur filter is useful, then I'll try to write something
better. Otherwise I think it is already good enough for the unsharp mask
filter, which is my primary goal.

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Gilles Caulier-4
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #4 from Gilles Caulier <[hidden email]> ---
Maik,

So, we can considerate that patch is enough to be included in 4.7.0, planed
next week end ?

Gilles

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Gilles Caulier-4
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #5 from Gilles Caulier <[hidden email]> ---
Note : i don't yet checked the patch, but blur algorithm is used in a lots of
places. For ex, in B&W converter.

We must take a care that blur loop must be very fast everywhere.

Gilles

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Maik Qualmann
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #6 from Maik Qualmann <[hidden email]> ---
We need yet to changes to the GUI, the radius value must be done in double
value. The patch is now a blur value of 10, which corresponded to previously 1.

Maik

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

pochini
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #7 from [hidden email] ---
Yes, it is not ready yet. Attached is a more complete patch (against 4.6.0)
involving four files:

dimg/filters/fx/blurfilter.cpp: About the same of the previous patch, but
without debug stuff. I also moved the check for too-small-radius outside the
loop and reindented.

dimg/filters/fx/blurfilter.h: changed radius type to float.

dimg/filters/fx/charcoalfilter.cpp: Do not cast smooth/10 to integer.

dimg/filters/sharp/unsharpmaskfilter.cpp: Pass m_radius as-is, instead of
(int)r/10.

Concerning the speed, it is about 25% slower. For example on my pc the time to
blur with radius=3 an 8 bits 15MP image was 650ms and now it is 800ms.

TODO:

- Some users have not been checked yes (watermark, redeyetool, blurfxfilter,
filtermanager?, infraredfilter)
- Am I missing something ?

(ok, don't laugh now, but I can't find those filters in the menus... where are
they ??)

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

pochini
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

[hidden email] changed:

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--- Comment #8 from [hidden email] ---
Created attachment 90530
  --> https://bugs.kde.org/attachment.cgi?id=90530&action=edit
Blur filter enhancement (v.2)

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Gilles Caulier-4
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #9 from Gilles Caulier <[hidden email]> ---
> Some filters that have not been checked yet (watermark, redeyetool, blurfxfilter, >filtermanager?, infraredfilter). Am I missing something ?

Grep "BlurFilter" class name to identify where algorithm is used in digiKam
core :

[gilles@localhost core]$ pwd                                                    
/home/gilles/Devel/KF5/dk-sc/core
[gilles@localhost core]$ grep -r "BlurFilter" .

==> output filtered :

UnsharpedMask filter : ./libs/dimg/filters/sharp/unsharpmaskfilter.cpp:  
BlurFilter(this, m_orgImage, m_destImage, 0, 10, (int)(m_radius*10.0));
Infrared filter : ./libs/dimg/filters/bw/infraredfilter.cpp:  
BlurFilter(this, BWImage, BWBlurImage, 10, 20, blurRadius);

Filter Manager for versionning feature : This much by patched to be compatible,
especially if filter argumer change. There is a version ID in BlurFilter
implementation dedicated for that :
./libs/dimg/filters/dimgfiltermanager.cpp:            << ImgFilterPtr(new
BasicDImgFilterGenerator<BlurFilter>())
./libs/dimg/filters/dimgfiltermanager.cpp:  
filterIcons.insert("digikam:BlurFilter",           "blurimage");

BlurFx filter :

./libs/dimg/filters/fx/blurfxfilter.cpp:        BlurFilter(this, *orgImage,
*destImage, 10, 75, BlurRadius);
./libs/dimg/filters/fx/blurfxfilter.cpp:        BlurFilter(this, *orgImage,
*destImage, 10, 80, BlurRadius);

Charcoal Filter :

./libs/dimg/filters/fx/charcoalfilter.cpp:    BlurFilter(this, m_destImage,
m_destImage, 80, 85, (int)(d->smooth / 10.0));

Versionning test code :

./tests/abstractdimagehistorytest.cpp:    BlurFilter filter(iface.original(),
this);

BQM Watermark tool :

./utilities/queuemanager/basetools/decorate/watermark.cpp:        BlurFilter
blur(&backgroundLayer, 0L, radius);

BQM Blur Tool :

./utilities/queuemanager/basetools/enhance/blur.cpp:    BlurFilter
blur(&image(), 0L, radius);

Editor Red Eyes removal tool :

./imageplugins/enhance/redeyetool.cpp:    BlurFilter blur(&mask2, 0L,
d->smoothLevel->value());

Editor Blur tool :

./imageplugins/enhance/blurtool.cpp:    setFilter(new BlurFilter(&img, this,
d->radiusInput->value()));
./imageplugins/enhance/blurtool.cpp:    setFilter(new
BlurFilter(iface.original(), this, d->radiusInput->value()));

This grep is done on code from KF5 frameworks branch but this must be very
similar on KDE4 code (git/master branch)

Voilà

Gilles Caulier

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Gilles Caulier-4
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #10 from Gilles Caulier <[hidden email]> ---
Another point : Blur filter use muti-threading to compute loop.

It's based on QtConcurrent API. Most of filters in digiKam core which require
computation loop use the same mechanism. It's simple : you look how CPU core
are available, and you divide image to process by CPU core. The main loop is
coded in a re-entrant method, and you call in parallel this method on separated
thread running on each CPU core.

If you change computation loop, you must preserve multithreading support to
have the best performances.

Gilles Caulier

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

pochini
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
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--- Comment #11 from [hidden email] ---
Created attachment 91070
  --> https://bugs.kde.org/attachment.cgi?id=91070&action=edit
Blur filter enhancement (v.3)

(In reply to Gilles Caulier from comment #9)
> > Some filters that have not been checked yet (watermark, redeyetool, blurfxfilter, >filtermanager?, infraredfilter). Am I missing something ?
>
> Grep "BlurFilter" class name to identify where algorithm is used in digiKam
> core :
>
> [gilles@localhost core]$ pwd                                                
>
> /home/gilles/Devel/KF5/dk-sc/core
> [gilles@localhost core]$ grep -r "BlurFilter" .

Yes, I know how to use grep and I wrote a list of the things to to yet... The
point is I could not test all those tools. I didn't figure out that some of
them are batch tools.


> ==> output filtered :
>
> UnsharpedMask filter : ./libs/dimg/filters/sharp/unsharpmaskfilter.cpp:  
> BlurFilter(this, m_orgImage, m_destImage, 0, 10, (int)(m_radius*10.0));

Already fixed in the first patch.


> Infrared filter : ./libs/dimg/filters/bw/infraredfilter.cpp:  
> BlurFilter(this, BWImage, BWBlurImage, 10, 20, blurRadius);

I cannot find this one. It was a tool its own reachable from the menu. Now it
is only part of the B/W tool, right?
No changes are needed as the images compare identical with and without the
patch (I tried a couple of IR films).


> Filter Manager for versionning feature : This much by patched to be
> compatible, especially if filter argumer change. There is a version ID in
> BlurFilter implementation dedicated for that :
> ./libs/dimg/filters/dimgfiltermanager.cpp:            << ImgFilterPtr(new
> BasicDImgFilterGenerator<BlurFilter>())
> ./libs/dimg/filters/dimgfiltermanager.cpp:  
> filterIcons.insert("digikam:BlurFilter",           "blurimage");

Uhmm... I don't know what do do here.


> BlurFx filter :
>
> ./libs/dimg/filters/fx/blurfxfilter.cpp:        BlurFilter(this, *orgImage,
> *destImage, 10, 75, BlurRadius);
> ./libs/dimg/filters/fx/blurfxfilter.cpp:        BlurFilter(this, *orgImage,
> *destImage, 10, 80, BlurRadius);

As above, no changes are needed: since the radius is an integer value the
result is identical to the old filter.


> Charcoal Filter :
>
> ./libs/dimg/filters/fx/charcoalfilter.cpp:    BlurFilter(this, m_destImage,
> m_destImage, 80, 85, (int)(d->smooth / 10.0));

Fixed.


> Versionning test code :
>
> ./tests/abstractdimagehistorytest.cpp:    BlurFilter
> filter(iface.original(), this);

Looks ok as-is, but I'm not sure.


> BQM Watermark tool :
>
> ./utilities/queuemanager/basetools/decorate/watermark.cpp:        BlurFilter
> blur(&backgroundLayer, 0L, radius);
>
> BQM Blur Tool :
>
> ./utilities/queuemanager/basetools/enhance/blur.cpp:    BlurFilter
> blur(&image(), 0L, radius);
>
> Editor Red Eyes removal tool :
>
> ./imageplugins/enhance/redeyetool.cpp:    BlurFilter blur(&mask2, 0L,
> d->smoothLevel->value());
>
> Editor Blur tool :
>
> ./imageplugins/enhance/blurtool.cpp:    setFilter(new BlurFilter(&img, this,
> d->radiusInput->value()));
> ./imageplugins/enhance/blurtool.cpp:    setFilter(new
> BlurFilter(iface.original(), this, d->radiusInput->value()));

No changes are needed for those tools.


> This grep is done on code from KF5 frameworks branch but this must be very
> similar on KDE4 code (git/master branch)

I attached another patch. It's against digikam-4.7.0.

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Gilles Caulier-4
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #12 from Gilles Caulier <[hidden email]> ---
> Infrared filter : ./libs/dimg/filters/bw/infraredfilter.cpp:  
> BlurFilter(this, BWImage, BWBlurImage, 10, 20, blurRadius);

>>I cannot find this one. It was a tool its own reachable from the menu. Now it is only part of the B/W tool, right?

yes it it

>>No changes are needed as the images compare identical with and without the patch (I tried a couple of IR films).

ok

> Filter Manager for versionning feature : This much by patched to be
> compatible, especially if filter argumer change. There is a version ID in
> BlurFilter implementation dedicated for that :
> ./libs/dimg/filters/dimgfiltermanager.cpp:            << ImgFilterPtr(new
> BasicDImgFilterGenerator<BlurFilter>())
> ./libs/dimg/filters/dimgfiltermanager.cpp:  
> filterIcons.insert("digikam:BlurFilter",           "blurimage");

>>Uhmm... I don't know what do do here.

Nothing special here.

> BlurFx filter :
>
> ./libs/dimg/filters/fx/blurfxfilter.cpp:        BlurFilter(this, *orgImage,
> *destImage, 10, 75, BlurRadius);
> ./libs/dimg/filters/fx/blurfxfilter.cpp:        BlurFilter(this, *orgImage,
> *destImage, 10, 80, BlurRadius);

>>As above, no changes are needed: since the radius is an integer value the result is identical to the old filter.

ok.

> Charcoal Filter :
>
> ./libs/dimg/filters/fx/charcoalfilter.cpp:    BlurFilter(this, m_destImage,
> m_destImage, 80, 85, (int)(d->smooth / 10.0));

>>Fixed.

ok

> Versionning test code :
>
> ./tests/abstractdimagehistorytest.cpp:    BlurFilter
> filter(iface.original(), this);

>>Looks ok as-is, but I'm not sure.

ok

> BQM Watermark tool :
>
> ./utilities/queuemanager/basetools/decorate/watermark.cpp:        BlurFilter
> blur(&backgroundLayer, 0L, radius);
>
> BQM Blur Tool :
>
> ./utilities/queuemanager/basetools/enhance/blur.cpp:    BlurFilter
> blur(&image(), 0L, radius);
>
> Editor Red Eyes removal tool :
>
> ./imageplugins/enhance/redeyetool.cpp:    BlurFilter blur(&mask2, 0L,
> d->smoothLevel->value());
>
> Editor Blur tool :
>
> ./imageplugins/enhance/blurtool.cpp:    setFilter(new BlurFilter(&img, this,
> d->radiusInput->value()));
> ./imageplugins/enhance/blurtool.cpp:    setFilter(new
> BlurFilter(iface.original(), this, d->radiusInput->value()));

>>No changes are needed for those tools.

ok

I think you forgot somthing important in your patch : Blur filter settings
version ID with compatibility with older version. It's for versionning feature.

This ID are registered in this header :

https://projects.kde.org/projects/extragear/graphics/digikam/repository/revisions/master/entry/libs/dimg/filters/fx/blurfilter.h#L62

Both methods :

CurrentVersion()
SupportedVersions()

return respectively the version ID of filter (with the current settings
supported), and the list of version where current settings still compatible.

As you have changed settings, ID must be updated and supported version ID
patched.

Gilles Caulier

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Gilles Caulier-4
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #13 from Gilles Caulier <[hidden email]> ---
Pochini,

Did you seen my previous message ?

Gilles Caulier

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

pochini
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #14 from [hidden email] ---
(In reply to Gilles Caulier from comment #13)
> Pochini,
>
> Did you seen my previous message ?
>
> Gilles Caulier

Yes, sorry, I don't have a lot of time outside the weekends...
I had a look at supportedVersions() methods. All filters are version 1, so
there are no examples. I don't know how the versioning system is supposed to
work. I have to (correct mw if I'm wrong):

- write a wrapper or an overloaded version of the blur filter method to provide
compatibility with external (all internal users have been adapted)
tools/plugins.
- call setFilterVersion() to allow caller undo/redo/repeat an operation using
the correct version.
- Increment version to 2.

Since the caller invokes the methos directly, do I have to get the version the
caller wants to use (how?), translate the arguments and finally call the
desired filter?

Or can I just bump the version number?

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Gilles Caulier-4
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #15 from Gilles Caulier <[hidden email]> ---
Bump the version number.

I plan to introduce the patch with next Qt5 based version 5.0.0, not 4.x.

Gilles Caulier

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

pochini
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https://bugs.kde.org/show_bug.cgi?id=342513

[hidden email] changed:

           What    |Removed                     |Added
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  Attachment #91070|0                           |1
        is obsolete|                            |

--- Comment #16 from [hidden email] ---
Created attachment 91223
  --> https://bugs.kde.org/attachment.cgi?id=91223&action=edit
Blur filter enhancement (v.4)

Same patch, with filter version = 2.

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

Gilles Caulier-4
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

--- Comment #17 from Gilles Caulier <[hidden email]> ---
Maik,

Patch from this entry must be applied against frameworks branch, not
git/master. There are to much changed and a broken compatibility about blur
filter settings. Planing to fix this entry for KF5 sound the best way.

Gilles

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[digikam] [Bug 342513] Add support for fractional radius in blur and unsharp mask filters [patch]

bugzilla_noreply
In reply to this post by pochini
https://bugs.kde.org/show_bug.cgi?id=342513

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           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|ImageEditor                 |ImageEditor-Tool-Sharpen

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