[Darktable-users] Lab curves vs. velvia vs. vibrance

Discussion:

Paul Glad Mihai

2013-12-04 10:37:44 UTC

Hi there,

In order to get nicer contrasts I started playing around with the Lab
curves (Re: Marugulis' - Photoshop Lab Color, i.e. make the a and b
slopes steeper to pull colors apart). I noticed this works great but not
on all photos. Some just punch the blues, or greens or yellows and it
doesn't look that great. So I reverted to velvia.

Now I heard somewhere that one can apply multiple instances of velvia
and use blending modes to achieve very nice effects. Can someone give me
some tips on using these? I would really appreciate that.

Further, can these tricks also be used on the vibrance?

Thanks for your time.

Glad

P.S. Is there no way to donate towards this project?

--
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Victor L

2013-12-04 11:00:52 UTC

Permalink

Hello,

You should read the blog articles about
masks<http://www.darktable.org/2013/04/masks/>and
multi-instances <http://www.darktable.org/2013/02/multi-instances/>.
Remember some of the masks features are only available in the nearly
released version (1.4).

Bye

Post by Paul Glad Mihai
Hi there,
In order to get nicer contrasts I started playing around with the Lab
curves (Re: Marugulis' - Photoshop Lab Color, i.e. make the a and b
slopes steeper to pull colors apart). I noticed this works great but not
on all photos. Some just punch the blues, or greens or yellows and it
doesn't look that great. So I reverted to velvia.
Now I heard somewhere that one can apply multiple instances of velvia
and use blending modes to achieve very nice effects. Can someone give me
some tips on using these? I would really appreciate that.
Further, can these tricks also be used on the vibrance?
Thanks for your time.
Glad
P.S. Is there no way to donate towards this project?
--
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Paul Glad Mihai

2013-12-04 14:02:49 UTC

Permalink

Hi Victor,

Thanks for the great tip. I will look into it. I am familiar with
multiple instances, but I thought someone could point me some specific
tricks, i.e. a first instance of velvia that is only applied to a
certain blending mode, and another instance that is applied to another
blending mode.

Can anybody help?

Regards,
Glad

Post by Victor L
Hello,
You should read the blog articles about masks
<http://www.darktable.org/2013/04/masks/> and multi-instances
<http://www.darktable.org/2013/02/multi-instances/>. Remember some of
the masks features are only available in the nearly released version (1.4).
Bye
Hi there,
In order to get nicer contrasts I started playing around with the Lab
curves (Re: Marugulis' - Photoshop Lab Color, i.e. make the a and b
slopes steeper to pull colors apart). I noticed this works great but not
on all photos. Some just punch the blues, or greens or yellows and it
doesn't look that great. So I reverted to velvia.
Now I heard somewhere that one can apply multiple instances of velvia
and use blending modes to achieve very nice effects. Can someone give me
some tips on using these? I would really appreciate that.
Further, can these tricks also be used on the vibrance?
Thanks for your time.
Glad
P.S. Is there no way to donate towards this project?
--
Sent from my iTooth. Get your own teeth to send Emails under
www.itooth.com <http://www.itooth.com>
------------------------------------------------------------------------------
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Download it for free now!
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_______________________________________________
Darktable-users mailing list
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Rob Z. Smith

2013-12-04 15:20:17 UTC

Permalink

Hi Glad,

It doesn't really need any tricks or blending modes on Velvia, just apply more than once if you want an even stronger effect or a mask if you want only a selected area processed. Or add an instance of vibrance rather than two velvias.

Not all things have to be difficult :-)

Rgds,
Rob.

-----Original Message-----
From: Paul Glad Mihai [mailto:***@posteo.de]
Sent: 04 December 2013 14:03
To: Victor L
Cc: Darktable-users
Subject: Re: [Darktable-users] Lab curves vs. velvia vs. vibrance

Hi Victor,

Thanks for the great tip. I will look into it. I am familiar with multiple instances, but I thought someone could point me some specific tricks, i.e. a first instance of velvia that is only applied to a certain blending mode, and another instance that is applied to another blending mode.

Can anybody help?

Regards,
Glad

--
Sent from my iTooth. Get your own teeth to send Emails under www.itooth.com

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Victor L

2013-12-05 11:14:41 UTC

Permalink

Personally I like to use the velvia tool with a blending mode which
includes only high values in the grey channel and where saturation is not
to high.
This way its brings beautiful colors where I usually want without too much
overall saturation.

IMHO the question is : what do expect from the velvia module ? Setting the
velvia module should be the easy part :)

Post by Rob Z. Smith
Hi Glad,
It doesn't really need any tricks or blending modes on Velvia, just apply
more than once if you want an even stronger effect or a mask if you want
only a selected area processed. Or add an instance of vibrance rather than
two velvias.
Not all things have to be difficult :-)
Rgds,
Rob.
-----Original Message-----
Sent: 04 December 2013 14:03
To: Victor L
Cc: Darktable-users
Subject: Re: [Darktable-users] Lab curves vs. velvia vs. vibrance
Hi Victor,
Thanks for the great tip. I will look into it. I am familiar with multiple
instances, but I thought someone could point me some specific tricks, i.e.
a first instance of velvia that is only applied to a certain blending mode,
and another instance that is applied to another blending mode.
Can anybody help?
Regards,
Glad

(1.4).

Post by Victor L
Bye
Hi there,
In order to get nicer contrasts I started playing around with the Lab
curves (Re: Marugulis' - Photoshop Lab Color, i.e. make the a and b
slopes steeper to pull colors apart). I noticed this works great but

not

Post by Victor L
on all photos. Some just punch the blues, or greens or yellows and it
doesn't look that great. So I reverted to velvia.
Now I heard somewhere that one can apply multiple instances of velvia
and use blending modes to achieve very nice effects. Can someone

give me

Post by Victor L
some tips on using these? I would really appreciate that.
Further, can these tricks also be used on the vibrance?
Thanks for your time.
Glad
P.S. Is there no way to donate towards this project?
--
Sent from my iTooth. Get your own teeth to send Emails under
www.itooth.com <http://www.itooth.com>

------------------------------------------------------------------------------

Post by Victor L
Sponsored by Intel(R) XDK
Develop, test and display web and hybrid apps with a single code

base.

Post by Victor L
Download it for free now!

http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.clktrk

Post by Victor L
_______________________________________________
Darktable-users mailing list
https://lists.sourceforge.net/lists/listinfo/darktable-users

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www.itooth.com
------------------------------------------------------------------------------
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Develop, test and display web and hybrid apps with a single code base.
Download it for free now!
http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.clktrk
_______________________________________________
Darktable-users mailing list
https://lists.sourceforge.net/lists/listinfo/darktable-users
This email is confidential and is intended for the addressee only. If you
are not the addressee, please delete the email and do not use it in any
way. Please note that any views or opinions presented in this email are
solely those of the author and do not necessarily represent those of the
company. NHBC reserves the right to monitor all email communications. The
recipient should check this email and any attachments for the presence of
viruses. The company accepts no liability for any damage caused by any
virus transmitted by this email. NHBC, the National House-Building Council,
is limited by guarantee in England, No 320784. Registered address: NHBC
House, Davy Avenue, Knowlhill, Milton Keynes MK5 8FP. NHBC is authorised by
the Prudential Regulation Authority and regulated by the Financial Conduct
Authority and Prudential Regulation Authority. NHBC Building Control
Services Ltd, registered by guarantee in England with Company No. 01952969.
Registered address: NHBC House, Davy Avenue, Knowlhill, Milton Keynes MK5
8FP. NHBC Services Ltd registered by guarantee in England, No 03067703.
Registered address: NHBC House, Davy Avenue, Knowlhill, Milton Keynes MK5
8FP. If you make a claim under a Buildmark policy your personal details
will be stored and processed in accordance with the Data Protection Act.
Your personal details may be passed to others involved with your claim such
as the original builder, or a consultant or remedial works contractor that
we may employ in connection with your claim(s) and matter ancillary to your
claim(s). Other than disclosure provided for in this statement, we will not
pass any data about you to any other party without your permission unless
we are required to do so by law.

Tobias Ellinghaus

2013-12-04 11:04:15 UTC

Permalink

Post by Paul Glad Mihai
Hi there,

Hi.

Post by Paul Glad Mihai
In order to get nicer contrasts I started playing around with the Lab
curves (Re: Marugulis' - Photoshop Lab Color, i.e. make the a and b
slopes steeper to pull colors apart). I noticed this works great but not
on all photos. Some just punch the blues, or greens or yellows and it
doesn't look that great. So I reverted to velvia.
Now I heard somewhere that one can apply multiple instances of velvia
and use blending modes to achieve very nice effects. Can someone give me
some tips on using these? I would really appreciate that.
Further, can these tricks also be used on the vibrance?

I will leave this to be answered by people actually making use of multi
instance for these things ...

Post by Paul Glad Mihai
Thanks for your time.
Glad
P.S. Is there no way to donate towards this project?

... but I can answer this: No, you can't donate at the moment. The reason is
as boring as simple: taxation. There is no formal organization behind
darktable so it's not that simple to collect money. There are plans to change
that but no concrete steps have been taken yet.
If you want to do something for us you can donate to the LGM Pledgie. The
money collected there will be used to pay developer's travel costs to meet in
Leipzig next April so we will benefit from that, too. I will write something on
the website about that soonish.

https://pledgie.com/campaigns/22927

Tobias

Michael Below

2013-12-04 11:34:40 UTC

Permalink

Hi,

regarding donations:

I read that the developers don't need donations for darktable development --
good for you :-)

But I guess around the upcoming release, plus Christmas time, many people
will wonder if they could donate something. The developers could name a
NGO/charity they like, so that people can donate there and mention
darktable.

Ideally, it should be an international organization, so that people can
donate in their country, without a difficult international money transfer.

Two suggestions:

Doctors without Borders/Medecins sans Frontieres: They provide medical aid,
often in conflict zones, won the Nobel Peace Prize. They have an
international donations page that points you to the office in your country:
http://www.msf.org/donate
Wikipedia: http://en.wikipedia.org/wiki/Doctors_without_borders

Friends of the Earth: An international network of environmental
organizations, working e.g. on climate change and sustainable development.
They have an international donations page using Paypal:
https://donate.foei.org/page/contribute/support-our-work
Wikipedia: http://en.wikipedia.org/wiki/Friends_of_the_Earth

Cheers

Michael

Dimitrios Psychogios

2013-12-04 12:33:59 UTC

Permalink

In addition to general charities, there is also
http://www.spi-inc.org/projects/ which is specifically for FOSS projects.

Post by Michael Below
Hi,
I read that the developers don't need donations for darktable development --
good for you :-)
But I guess around the upcoming release, plus Christmas time, many people
will wonder if they could donate something. The developers could name a
NGO/charity they like, so that people can donate there and mention
darktable.
Ideally, it should be an international organization, so that people can
donate in their country, without a difficult international money transfer.
Doctors without Borders/Medecins sans Frontieres: They provide medical aid,
often in conflict zones, won the Nobel Peace Prize. They have an
http://www.msf.org/donate
Wikipedia: http://en.wikipedia.org/wiki/Doctors_without_borders
Friends of the Earth: An international network of environmental
organizations, working e.g. on climate change and sustainable development.
https://donate.foei.org/page/contribute/support-our-work
Wikipedia: http://en.wikipedia.org/wiki/Friends_of_the_Earth
Cheers
Michael
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Tobias Ellinghaus

2013-12-04 13:19:55 UTC

Permalink

Post by Dimitrios Psychogios
In addition to general charities, there is also
http://www.spi-inc.org/projects/ which is specifically for FOSS projects.

And LGM which benefits darktable directly. :)

That being said, Doctors without Borders are a great money sink, too. So don't
feel bad if you are charitable instead of paying us a trip to Leipzig.

Tobias

Post by Dimitrios Psychogios

Alexandre Prokoudine

2013-12-04 15:03:35 UTC

Permalink

Post by Michael Below
Friends of the Earth: An international network of environmental
organizations, working e.g. on climate change

Ah, so this is who's desponsible for the climate change :)

I would humbly suggest supporting LGM.

https://pledgie.com/campaigns/22927

Alexandre

Michael Below

2013-12-04 23:29:24 UTC

Permalink

Post by Alexandre Prokoudine

Post by Michael Below
Friends of the Earth: An international network of environmental
organizations, working e.g. on climate change

Ah, so this is who's desponsible for the climate change :)

Yep, and they need your support... Making sea levels rise is hard
work :-)

Cheers

Michael

Paul Glad Mihai

2013-12-05 11:25:00 UTC

Permalink

Hi Victor,

Post by Victor L
Personally I like to use the velvia tool with a blending mode which
includes only high values in the grey channel and where saturation is not
to high.
This way its brings beautiful colors where I usually want without too much
overall saturation.

Now this is a great tip. I wouldn't have thought of using the grey
channel, because I am not too familiar with each channel. I will try it
out. This is the sort of tip I was looking for. Thanks!

Post by Victor L
IMHO the question is : what do expect from the velvia module ? Setting the
velvia module should be the easy part

Post by Rob Z. Smith
Hi Glad,
It doesn't really need any tricks or blending modes on Velvia, just apply
more than once if you want an even stronger effect or a mask if you want
only a selected area processed. Or add an instance of vibrance rather than
two velvias.
Not all things have to be difficult
Rgds,
Rob.
-----Original Message-----
Sent: 04 December 2013 14:03
To: Victor L
Cc: Darktable-users
Subject: Re: [Darktable-users] Lab curves vs. velvia vs. vibrance
Hi Victor,
Thanks for the great tip. I will look into it. I am familiar with multiple
instances, but I thought someone could point me some specific tricks, i.e.
a first instance of velvia that is only applied to a certain blending mode,
and another instance that is applied to another blending mode.
Can anybody help?
Regards,
Glad

(1.4).

not

give me

--
Sent from my iTooth. Get your own teeth to send Emails under www.itooth.com

Rob Z. Smith

2013-12-05 11:53:49 UTC

Permalink

Well, yes, OK. Obviously you do what works for you and it all depends on what you are trying to achieve but I tend to regard blend modes as more useful for simple operations like colour saturation where I may want to tweak the effect.

Velvia and Vibrance perform quite specific effects and already have inbuilt adaptive processing to work selectively on the image according to brightness and saturation of the pixels so there shouldn't in general to use blending on top of these. But if you have an image and Velvia plus blend mode works for you then go for it.

Rgds,
Rob.

-----Original Message-----
From: Paul Glad Mihai [mailto:***@posteo.de]
Sent: 05 December 2013 11:25
To: Darktable-users
Subject: Re: [Darktable-users] Lab curves vs. velvia vs. vibrance

Hi Victor,

Post by Victor L
Personally I like to use the velvia tool with a blending mode which
includes only high values in the grey channel and where saturation is
not to high.
This way its brings beautiful colors where I usually want without too
much overall saturation.

Now this is a great tip. I wouldn't have thought of using the grey channel, because I am not too familiar with each channel. I will try it out. This is the sort of tip I was looking for. Thanks!

Post by Victor L
IMHO the question is : what do expect from the velvia module ? Setting
the velvia module should be the easy part

Post by Rob Z. Smith
Hi Glad,
It doesn't really need any tricks or blending modes on Velvia, just
apply more than once if you want an even stronger effect or a mask if
you want only a selected area processed. Or add an instance of
vibrance rather than two velvias.
Not all things have to be difficult
Rgds,
Rob.
-----Original Message-----
Sent: 04 December 2013 14:03
To: Victor L
Cc: Darktable-users
Subject: Re: [Darktable-users] Lab curves vs. velvia vs. vibrance
Hi Victor,
Thanks for the great tip. I will look into it. I am familiar with
multiple instances, but I thought someone could point me some specific tricks, i.e.
a first instance of velvia that is only applied to a certain blending
mode, and another instance that is applied to another blending mode.
Can anybody help?
Regards,
Glad

(1.4).

not

give me