[Bug 141439] New: Whishlist: A velvia similar plugin. AKA vivid saturation

[Juanma Font]

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           Summary: Whishlist:  A velvia similar plugin. AKA vivid
                    saturation
           Product: digikam
           Version: 0.9.0
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel kde org
        ReportedBy: juanmafont gmail com


Version:           0.9.0 (using KDE KDE 3.5.6)
Installed from:    Ubuntu Packages
OS:                Linux

This is an very cool plugin for photographers.

  You can get moore information (include code for gimp plugin ) here: http://www.trsqr.net/photokit/vs.html

  you can see better examples results here: http://www.fredmiranda.com/DV/index.html

   This effect AKA velvia film effect.

   Regards
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[Gilles Caulier-2]

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caulier.gilles kdemail net changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|digikam                     |digikamimageplugins
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[Gilles Caulier-2]

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           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |Wish for new plugin
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[Juanma Font]

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juanmafont gmail com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Wish for new plugin         |general
            Product|digikamimageplugins         |digikam



------- Additional Comments From juanmafont gmail com  2007-02-09 14:38 -------
Another good site to see how this effect work over LAB channel with examples and step by step.

  http://www.outbackphoto.com/workflow/wf_81/essay.html
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[Gilles Caulier-2]

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           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|digikam                     |digikamimageplugins
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[Gilles Caulier-2]

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           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |Wish for new plugin
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[Gerhard Kulzer]

Am Friday 09 February 2007 schrieb Juanma Font:

> ------- You are receiving this mail because: -------
> You are the assignee for the bug, or are watching the assignee.
>
> http://bugs.kde.org/show_bug.cgi?id=141439
>            Summary: Whishlist:  A velvia similar plugin. AKA vivid
>                     saturation
>            Product: digikam
>            Version: 0.9.0
>           Platform: Ubuntu Packages
>         OS/Version: Linux
>             Status: UNCONFIRMED
>           Severity: wishlist
>           Priority: NOR
>          Component: general
>         AssignedTo: digikam-devel kde org
>         ReportedBy: juanmafont gmail com
>
>
> Version:           0.9.0 (using KDE KDE 3.5.6)
> Installed from:    Ubuntu Packages
> OS:                Linux
>
> This is an very cool plugin for photographers.
>
>   You can get moore information (include code for gimp plugin ) here:
> http://www.trsqr.net/photokit/vs.html
>
>   you can see better examples results here:
> http://www.fredmiranda.com/DV/index.html
>
>    This effect AKA velvia film effect.
>

What is the interest of this plugin? I can reproduce the same thing and better
with digikam. I can't see the use?

Gerhard


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[Gerhard Kulzer]

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------- Additional Comments From gerhard kulzer net  2007-02-09 23:20 -------
Am Friday 09 February 2007 schrieb Juanma Font:
[bugs.kde.org quoted mail]
What is the interest of this plugin? I can reproduce the same thing and better
with digikam. I can't see the use?

Gerhard
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------- Additional Comments From mikmach wp pl  2007-02-10 10:48 -------
> [bugs.kde.org quoted mail]
> What is the interest of this plugin? I can reproduce the same thing and
> better with digikam. I can't see the use?


No. You cannot reliably reproduce the same thing in Digikam because in
Digikam you cannot operate in L*a*b space. And while I think such
specialized plugin (Velvia effect) wouldn't be very useful but
possibility to operate in L*a*b would be *very* welcome.
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[Gerhard Kulzer]

Am Saturday 10 February 2007 schrieb Mikolaj Machowski:

> ------- You are receiving this mail because: -------
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>
> http://bugs.kde.org/show_bug.cgi?id=141439
>
>
>
>
> ------- Additional Comments From mikmach wp pl  2007-02-10 10:48 -------
>
> > [bugs.kde.org quoted mail]
> > What is the interest of this plugin? I can reproduce the same thing and
> > better with digikam. I can't see the use?
>
> No. You cannot reliably reproduce the same thing in Digikam because in
> Digikam you cannot operate in L*a*b space. And while I think such
> specialized plugin (Velvia effect) wouldn't be very useful but
> possibility to operate in L*a*b would be *very* welcome.

Sorry for my ignorance about L*a*b space.
My comment originated from taking the examples on the internet and using
digikam to reproduce the effect. With a bit of whitebalance, intensity and
U-mask I got very quickly the (visually) same results.

Gerhard

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[Gerhard Kulzer]

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------- Additional Comments From gerhard kulzer net  2007-02-10 12:48 -------
Am Saturday 10 February 2007 schrieb Mikolaj Machowski:
[bugs.kde.org quoted mail]
Sorry for my ignorance about L*a*b space.
My comment originated from taking the examples on the internet and using
digikam to reproduce the effect. With a bit of whitebalance, intensity and
U-mask I got very quickly the (visually) same results.

Gerhard
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[Juanma Font]

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------- Additional Comments From juanmafont gmail com  2007-02-10 13:58 -------
A plugin that can reproduce the velvia effect will be very apreciated by a lot of photographers (I'm an amateur photograph and this effect is very used at gimp by photographers but whith the limitation of 8 bits).

   Of course, if we can operate at LAB space we can get the same ,but we need technical information about the process and, of course, this is something that many people don't have.
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[Gilles Caulier-2]

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------- Additional Comments From caulier.gilles kdemail net  2007-02-10 14:03 -------
Nota : digikam use lcms to handle color space. It's easy to toggle on LAB color space to perform color adjustement.

Gilles Caulier
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[Geoff King-2]

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------- Additional Comments From gsking1 yahoo com  2007-02-10 15:07 -------
I agree with #5. It's always nice to have another more specialized color plugin.
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[Gerhard Kulzer]

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------- Additional Comments From gerhard kulzer net  2007-02-12 09:47 -------
I did some more testing with the Gimp eg-color saturation tool (which is supposedly the equivalent of velvia), and I changed my mind (see #4). My tests with the small images from the referenced websites did not reveal the power of the plugin. Now with high resolution images I can appreciate the worth of such a plugin, it is very desirable indeed.

Gerhard
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[Gilles Caulier-2]

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------- Additional Comments From caulier.gilles kdemail net  2007-02-12 09:54 -------
hey guy,

I have take a look into the vivid saturation gimp plugin : it's a script scheme  plugin...

It's very simple gerhard. Look like the code is a few line :

(define (script-fu-vivid-saturation inImg inDrw inAmount)

  (let* (

         (amount (/ inAmount 100)))

    (gimp-image-undo-group-start inImg)

    (plug-in-colors-channel-mixer TRUE inImg inDrw FALSE (+ 1 amount amount) (- amount) (- amount) (- amount) (+ 1 amount amount) (- amount) (- amount) (- amount) (+ 1 amount amount))

    (define (spline)
      (let* ((a (cons-array 8 'byte)))
        (set-pt a 0 0 0)
        (set-pt a 1 63 60)
        (set-pt a 2 191 194)
        (set-pt a 3 255 255)
        a))
 
    (gimp-curves-spline inDrw 0 8 (spline))

    (gimp-image-undo-group-end inImg)
    (gimp-displays-flush)
    )
  )


It's use color mixer and curve tools. both are include in digiKam and of course support 16 bits color depth (unlike gimp do!)

Gerhard, try to reproduce the plugin using digiKam tools by hand and give me your viewpoint. From a developper point, i can do it in 5 minutes (:=)))

Gilles
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[Juanma Font]

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------- Additional Comments From juanmafont gmail com  2007-02-12 10:37 -------

 Gilles Said
    "From a developper point, i can do it in 5 minutes"

   Ohhhhh.... this is a very good new !!!!

   Any developer with five (or ten.... or thirty....) minutes ?

   Please....please....  I promise sent two beers ¡¡¡¡

  Regards
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[Gerhard Kulzer]

Am Monday 12 February 2007 schrieb Gilles Caulier:

> ------- You are receiving this mail because: -------
> You are the assignee for the bug, or are watching the assignee.
>
> http://bugs.kde.org/show_bug.cgi?id=141439
>
>
>
>
> ------- Additional Comments From caulier.gilles kdemail net  2007-02-12
> 09:54 ------- hey guy,
>
> I have take a look into the vivid saturation gimp plugin : it's a script
> scheme  plugin...
>
> It's very simple gerhard. Look like the code is a few line :
>
> (define (script-fu-vivid-saturation inImg inDrw inAmount)
>
>   (let* (
>
> (amount (/ inAmount 100)))
>
>     (gimp-image-undo-group-start inImg)
>
>     (plug-in-colors-channel-mixer TRUE inImg inDrw FALSE (+ 1 amount
> amount) (- amount) (- amount) (- amount) (+ 1 amount amount) (- amount) (-
> amount) (- amount) (+ 1 amount amount))
>
>     (define (spline)
>       (let* ((a (cons-array 8 'byte)))
> (set-pt a 0 0 0)
> (set-pt a 1 63 60)
> (set-pt a 2 191 194)
> (set-pt a 3 255 255)
> a))
>
>     (gimp-curves-spline inDrw 0 8 (spline))
>
>     (gimp-image-undo-group-end inImg)
>     (gimp-displays-flush)
>     )
>   )
>
>
> It's use color mixer and curve tools. both are include in digiKam and of
> course support 16 bits color depth (unlike gimp do!)
>
> Gerhard, try to reproduce the plugin using digiKam tools by hand and give
> me your viewpoint. From a developper point, i can do it in 5 minutes (:=)))
>

Hi Gilles,

I tried it with the mixer [took me a while to get back into the scheme syntax,
it should be called script-fou :-)] and it works well.
What I could not verify it the spline function (the channel mixing is applied
in a contrast enhanced manner: more inthe highlights, less in the shadows). I
think I cannot reproduce it manually, that must be done under the hood. But
even without spline the result looks quite promissing.

These are the values I tried (20% accentation):
# Channel Mixer Configuration File
CHANNEL: BLUE
PREVIEW: true
MONOCHROME: false
PRESERVE_LUMINOSITY: false
RED: 1.400 -0.200 -0.200
GREEN: -0.200 1.400 -0.200
BLUE: -0.200 -0.200 1.400
BLACK: 1.000 0.000 0.000

In gimp I needed only 6% to achieve the same effect. I believe the rest comes
through the contrast amplification.

my 10¢


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[Gerhard Kulzer]

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------- Additional Comments From gerhard kulzer net  2007-02-14 16:41 -------
Am Monday 12 February 2007 schrieb Gilles Caulier:
[bugs.kde.org quoted mail]
Hi Gilles,
I tried it with the mixer [took me a while to get back into the scheme syntax,
it should be called script-fou :-)] and it works well.
What I could not verify it the spline function (the channel mixing is applied
in a contrast enhanced manner: more inthe highlights, less in the shadows). I
think I cannot reproduce it manually, that must be done under the hood. But
even without spline the result looks quite promissing.

These are the values I tried (20% accentation):
# Channel Mixer Configuration File
CHANNEL: BLUE
PREVIEW: true
MONOCHROME: false
PRESERVE_LUMINOSITY: false
RED: 1.400 -0.200 -0.200
GREEN: -0.200 1.400 -0.200
BLUE: -0.200 -0.200 1.400
BLACK: 1.000 0.000 0.000

In gimp I needed only 6% to achieve the same effect. I believe the rest comes
through the contrast amplification.

my 10�

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[Gilles Caulier-4]

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------- Additional Comments From caulier.gilles gmail com  2007-03-08 17:11 -------
Created an attachment (id=19909)
 --> (http://bugs.kde.org/attachment.cgi?id=19909&action=view)
Experimental Velvia tool for image editor

Gerhard, it don't work properlly. You need to adjust patameter in Channel
Mixer.

The new option is in Filter menu. Just compile and install patched image plugin
core.

Gilles
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