Arutperumjothi wrote:
Hi all,

I am new to image processing . i have two images taken with different
white balance adjustments.
i need to compare this and say which one has more white balance . Can
anybody tell me how can I do this.  I am trying out this with Matrox
image processing library and AForge.Net.

Don't understand.  I understand what white
balance is.  I don't understand what you
mean by "more white balance".  I don't see
how white balance can be something you can
have more of.

--
Regards,
Martin Leese
E-mail: ple... at (no spam) see.Web.for.e-mail.INVALID
Web:http://members.tripod.com/martin_leese/

Arutperumjothi wrote:
On Jun 17, 10:34 am, Martin Leese <ple... at (no spam) see.Web.for.e-mail.INVALID
wrote:
Arutperumjothi wrote:
Hi all,
I am new to image processing . i have two images taken with different
white balance adjustments.
i need to compare this and say which one has more white balance . Can
anybody tell me how can I do this.  I am trying out this with Matrox
image processing library and AForge.Net.
Don't understand.  I understand what white
balance is.  I don't understand what you
mean by "more white balance".  I don't see
how white balance can be something you can
have more of.
Sorry for not being clear in query.
I have taken two images with web cam by  white balance adjustments ( I
guess i should be saying correcting white balance ) . I need to
compare the two images. Please tell me how can i compare these two
images.

Compare for what purpose?  What is your
goal?  Why do you want to do this?

Also, stuffing the two images on a website
somewhere and posting the link is always
helpful.

There are many ways to compare two images.
For example, you can just look at them.

--
Regards,
Martin Leese
E-mail: ple... at (no spam) see.Web.for.e-mail.INVALID
Web:http://members.tripod.com/martin_leese/- Hide quoted text -

- Show quoted text -

Hi all,

I am new to image processing . i have two images taken with different
white balance adjustments.
i need to compare this and say which one has more white balance . Can
anybody tell me how can I do this. I am trying out this with Matrox
image processing library and AForge.Net.

On Jun 17, 12:54 pm, Martin Leese <ple... at (no spam) see.Web.for.e-mail.INVALID
wrote:





Arutperumjothi wrote:
On Jun 17, 10:34 am, Martin Leese <ple... at (no spam) see.Web.for.e-mail.INVALID
wrote:
Arutperumjothi wrote:
Hi all,
I am new to image processing . i have two images taken with different
white balance adjustments.
i need to compare this and say which one has more white balance . Can
anybody tell me how can I do this.  I am trying out this with Matrox
image processing library and AForge.Net.
Don't understand.  I understand what white
balance is.  I don't understand what you
mean by "more white balance".  I don't see
how white balance can be something you can
have more of.
Sorry for not being clear in query.
I have taken two images with web cam by  white balance adjustments ( I
guess i should be saying correcting white balance ) . I need to
compare the two images. Please tell me how can i compare these two
images.

Compare for what purpose?  What is your
goal?  Why do you want to do this?

Also, stuffing the two images on a website
somewhere and posting the link is always
helpful.

There are many ways to compare two images.
For example, you can just look at them.

--
Regards,
Martin Leese
E-mail: ple... at (no spam) see.Web.for.e-mail.INVALID
Web:http://members.tripod.com/martin_leese/-Hide quoted text -

- Show quoted text -

Hi,

Thank you for the response.  I have uploaded the images in the below
link.http://groups.google.com/group/aforge/web/WB-Levels-BeforeAfter.jpeg
I have to compare the images and output the result as  which of the
images
has the  correct white balance. In the pictures in the above link we
can see the
second image looks more natural.   Ofcourse manually we can see both
images
and say which of them is better. Similarly i compare the luminosity of
the two images
and say which one is brighter picture.  Hope this is clear.

Thanks
Rajani- Hide quoted text -

- Show quoted text -

On Jun 17, 10:34 am, Martin Leese <ple... at (no spam) see.Web.for.e-mail.INVALID
wrote:
Arutperumjothi wrote:
Hi all,
I am new to image processing . i have two images taken with different
white balance adjustments.
i need to compare this and say which one has more white balance . Can
anybody tell me how can I do this. I am trying out this with Matrox
image processing library and AForge.Net.

Don't understand. I understand what white
balance is. I don't understand what you
mean by "more white balance". I don't see
how white balance can be something you can
have more of.

Sorry for not being clear in query.
I have taken two images with web cam by white balance adjustments ( I
guess i should be saying correcting white balance ) . I need to
compare the two images. Please tell me how can i compare these two
images.

On Jun 17, 12:54 pm, Martin Leese <ple... at (no spam) see.Web.for.e-mail.INVALID
wrote:



Arutperumjothi wrote:
On Jun 17, 10:34 am, Martin Leese <ple... at (no spam) see.Web.for.e-mail.INVALID
wrote:
Arutperumjothi wrote:
Hi all,
I am new to image processing . i have two images taken with different
white balance adjustments.
i need to compare this and say which one has more white balance . Can
anybody tell me how can I do this. I am trying out this with Matrox
image processing library and AForge.Net.
Don't understand. I understand what white
balance is. I don't understand what you
mean by "more white balance". I don't see
how white balance can be something you can
have more of.
Sorry for not being clear in query.
I have taken two images with web cam by white balance adjustments ( I
guess i should be saying correcting white balance ) . I need to
compare the two images. Please tell me how can i compare these two
images.

Compare for what purpose? What is your
goal? Why do you want to do this?

Also, stuffing the two images on a website
somewhere and posting the link is always
helpful.

There are many ways to compare two images.
For example, you can just look at them.

--
Regards,
Martin Leese
E-mail: ple... at (no spam) see.Web.for.e-mail.INVALID
Web:http://members.tripod.com/martin_leese/-Hide quoted text -

- Show quoted text -

Hi,

Thank you for the response. I have uploaded the images in the below
link.http://groups.google.com/group/aforge/web/WB-Levels-BeforeAfter.jpeg
I have to compare the images and output the result as which of the
images
has the correct white balance. In the pictures in the above link we
can see the
second image looks more natural. Ofcourse manually we can see both
images
and say which of them is better. Similarly i compare the luminosity of
the two images
and say which one is brighter picture. Hope this is clear.

Thanks
Rajani

On Jun 17, 5:03 am, rajani_sp <rajani... at (no spam) indiatimes.com> wrote:





On Jun 17, 12:54 pm, Martin Leese <ple... at (no spam) see.Web.for.e-mail.INVALID
wrote:

Arutperumjothi wrote:
On Jun 17, 10:34 am, Martin Leese <ple... at (no spam) see.Web.for.e-mail.INVALID
wrote:
Arutperumjothi wrote:
Hi all,
I am new to image processing . i have two images taken with different
white balance adjustments.
i need to compare this and say which one has more white balance . Can
anybody tell me how can I do this.  I am trying out this with Matrox
image processing library and AForge.Net.
Don't understand.  I understand what white
balance is.  I don't understand what you
mean by "more white balance".  I don't see
how white balance can be something you can
have more of.
Sorry for not being clear in query.
I have taken two images with web cam by  white balance adjustments ( I
guess i should be saying correcting white balance ) . I need to
compare the two images. Please tell me how can i compare these two
images.

Compare for what purpose?  What is your
goal?  Why do you want to do this?

Also, stuffing the two images on a website
somewhere and posting the link is always
helpful.

There are many ways to compare two images.
For example, you can just look at them.

--
Regards,
Martin Leese
E-mail: ple... at (no spam) see.Web.for.e-mail.INVALID
Web:http://members.tripod.com/martin_leese/-Hidequoted text -

- Show quoted text -

Hi,

Thank you for the response.  I have uploaded the images in the below
link.http://groups.google.com/group/aforge/web/WB-Levels-BeforeAfter.jpeg
I have to compare the images and output the result as  which of the
images
has the  correct white balance. In the pictures in the above link we
can see the
second image looks more natural.   Ofcourse manually we can see both
images
and say which of them is better. Similarly i compare the luminosity of
the two images
and say which one is brighter picture.  Hope this is clear.

Thanks
Rajani

You can't determine which image has the correct white balance unless
you know the spectral response (i.e. color) of the objects in the
image. To say "manually we can see both images and say which of them
is better," assumes that you know a priori the color of the wall. If
the wall is painted a yellowish off-white, then the image on the left
is correct; if the wall is painted white, then the image on the right
is correct; if the wall is painted pink, then neither is correct.

Ed M- Hide quoted text -

- Show quoted text -

On Jun 17, 10:39 am, "edward.s.mei... at (no spam) aero.org" <mei... at (no spam) aero.org
wrote:





On Jun 17, 5:03 am, rajani_sp <rajani... at (no spam) indiatimes.com> wrote:

On Jun 17, 12:54 pm, Martin Leese <ple... at (no spam) see.Web.for.e-mail.INVALID
wrote:

Arutperumjothi wrote:
On Jun 17, 10:34 am, Martin Leese <ple... at (no spam) see.Web.for.e-mail.INVALID
wrote:
Arutperumjothi wrote:
Hi all,
I am new to image processing . i have two images taken with different
white balance adjustments.
i need to compare this and say which one has more white balance . Can
anybody tell me how can I do this.  I am trying out this with Matrox
image processing library and AForge.Net.
Don't understand.  I understand what white
balance is.  I don't understand what you
mean by "more white balance".  I don't see
how white balance can be something you can
have more of.
Sorry for not being clear in query.
I have taken two images with web cam by  white balance adjustments ( I
guess i should be saying correcting white balance ) . I need to
compare the two images. Please tell me how can i compare these two
images.

Compare for what purpose?  What is your
goal?  Why do you want to do this?

Also, stuffing the two images on a website
somewhere and posting the link is always
helpful.

There are many ways to compare two images.
For example, you can just look at them.

--
Regards,
Martin Leese
E-mail: ple... at (no spam) see.Web.for.e-mail.INVALID
Web:http://members.tripod.com/martin_leese/-Hidequotedtext -

- Show quoted text -

Hi,

Thank you for the response.  I have uploaded the images in the below
link.http://groups.google.com/group/aforge/web/WB-Levels-BeforeAfter.jpeg
I have to compare the images and output the result as  which of the
images
has the  correct white balance. In the pictures in the above link we
can see the
second image looks more natural.   Ofcourse manually we can see both
images
and say which of them is better. Similarly i compare the luminosity of
the two images
and say which one is brighter picture.  Hope this is clear.

Thanks
Rajani

You can't determine which image has the correct white balance unless
you know the spectral response (i.e. color) of the objects in the
image. To say "manually we can see both images and say which of them
is better," assumes that you know a priori the color of the wall. If
the wall is painted a yellowish off-white, then the image on the left
is correct; if the wall is painted white, then the image on the right
is correct; if the wall is painted pink, then neither is correct.

Ed M- Hide quoted text -

- Show quoted text -

-----------------------------------------
Ed, you're correct and I think he knows it so that's why he amended
his post to just wanting some way to compare the two images.   That's
why I suggested Delta E.  It won't be calibrated but I think he's just
looking for something quick and dirty.
Regards,
ImageAnalyst
By the way, are you related to the famous Aden Meinel who founded the
Optical Sciences Center at the University of Arizona?- Hide quoted text -

- Show quoted text -

By the way, are you related to the famous Aden Meinel who founded the
Optical Sciences Center at the University of Arizona?

On Jun 17, 3:21 pm, ImageAnalyst <imageanal... at (no spam) mailinator.com> wrote:



By the way, are you related to the famous Aden Meinel who founded the
Optical Sciences Center at the University of Arizona?

Yep, he's my father. BTW, he also founded Kitt Peak...

Ed

P.S. I'm also the grandson of Edison Pettit of Nicholson & Pettit fame.

On Jun 18, 9:22 pm, "edward.s.mei... at (no spam) aero.org" <mei... at (no spam) aero.org
wrote:

On Jun 17, 3:21 pm, ImageAnalyst <imageanal... at (no spam) mailinator.com> wrote:

By the way, are you related to the famous Aden Meinel who founded the
Optical Sciences Center at the University of Arizona?

Yep, he's my father. BTW, he also founded Kitt Peak...

Ed

P.S. I'm also the grandson of Edison Pettit of Nicholson & Pettit fame.

Hi ImageAnalyst ,

I have got CIELAB colorspace  Delta E .
since i got to know that delta E is a mere number how will I conclude
which image is lighter in the perspective of white balacne. (  I saw
that delta E = Sqare root of the color differences of L A B ).  I am
very sorry if I am askig a basic stuff.

Thanks a ton,
Rajani