P: n/a

Hi all...
I have developed an application for managing a very large resource of
artist's paintings and posts them to a web site. The application works well.
I'm trying to reduce the complexity of having to work with photoshop and
integrate one feature into the application Distortion Transformations.
Background Information:
When paintings are photographed, it's impossible to get a completely perfect
image that requires straightening prior to cropping for a number of rasons 
the photographer is not standing square on to the painting, the painting is
leaning, the camera is not at the correct height, the camera causes barrel
distortion, etc...
Therefore each image must be loaded into photoshop, all 4 corners selected
using the polygonal lasso tool then manually applying a Distort
Transformation (Edit Transform Distort) on the selected region.
The Problem:
The GDI library comes standard with several rectangular transformations 
stretch, Skew, etc.. But these apply only to a perfect rectangular region
where all points are perpendicular to each other.
I have no problems in selecting the nonrectangular region  this is easy.
I'm stumped at trying to work out how to take this region and applying the
Photoshop like Distort Transformation.
Anyone have any pointers?
Thanks in advance...
Graeme  
Share this Question
P: n/a

Transformations are all done using Matrix math. This is not going to be an
easy task, because you will have to understand Matrix math to do it. Here
are some articles and sample code to get you started: http://www.bobpowell.net/transformations.htm http://www.codeproject.com/csharp/ma...sformation.asp http://www.euclideanspace.com/maths/...etic/index.htm http://www.euclideanspace.com/maths/...ion_csharp.htm

HTH,
Kevin Spencer
Microsoft MVP
Software Composer http://unclechutney.blogspot.com
The shortest distance between 2 points is a curve.
"GraGra33" <gr******@hotmail.comwrote in message
news:e9**************@TK2MSFTNGP02.phx.gbl...
Hi all...
I have developed an application for managing a very large resource of
artist's paintings and posts them to a web site. The application works
well.
I'm trying to reduce the complexity of having to work with photoshop and
integrate one feature into the application Distortion Transformations.
Background Information:
When paintings are photographed, it's impossible to get a completely
perfect
image that requires straightening prior to cropping for a number of
rasons 
the photographer is not standing square on to the painting, the painting
is
leaning, the camera is not at the correct height, the camera causes
barrel
distortion, etc...
Therefore each image must be loaded into photoshop, all 4 corners selected
using the polygonal lasso tool then manually applying a Distort
Transformation (Edit Transform Distort) on the selected region.
The Problem:
The GDI library comes standard with several rectangular transformations 
stretch, Skew, etc.. But these apply only to a perfect rectangular region
where all points are perpendicular to each other.
I have no problems in selecting the nonrectangular region  this is easy.
I'm stumped at trying to work out how to take this region and applying the
Photoshop like Distort Transformation.
Anyone have any pointers?
Thanks in advance...
Graeme
 
P: n/a

Hi...
Thanks for your suggestions  I've had a look at all the links mentioned.
Bob's and the CodeProject artile I've already looked at both and they deal
with rectangular regions (simple transformation) and not 4point polygons
(complex transformation).
I've also looked at Gimp and Paint.Net  both only deal with regions (simple
transformation) and don't have Photoshop's distort transformation (complex
transformation).
I'm trying to do 4point polygons (complex transformation) and not
rectangular regions (simple transformation). The GDI+ matrix transformations
only handle rectangular regions (simple transformation) as far as I can
ascertain.
To clarify what I'm trying to do, I'll give you another example  can send
you a sample image if you think that you know how it's done.
Example: The bottomleft and topright corners are not squared to the
Topleft & bottomright corners. To square the image, the topleft and
bottomright must stay anchored whilst the bottomleft must be distorted
towards the top and the topright corner must be distorted to the right.
Be aware that no two photos are the same and each photo will require
different distort transformation adjustments.
Do you still think that your suggestion will work or do you have another
idea?
Thanks for your help in advance,
Graeme
"Kevin Spencer" <un**********@nothinks.comwrote in message
news:e2**************@TK2MSFTNGP02.phx.gbl...
Transformations are all done using Matrix math. This is not going to be an
easy task, because you will have to understand Matrix math to do it. Here
are some articles and sample code to get you started:
http://www.bobpowell.net/transformations.htm http://www.codeproject.com/csharp/ma...sformation.asp http://www.euclideanspace.com/maths/...etic/index.htm http://www.euclideanspace.com/maths/...ion_csharp.htm

HTH,
Kevin Spencer
Microsoft MVP
Software Composer http://unclechutney.blogspot.com
The shortest distance between 2 points is a curve.
"GraGra33" <gr******@hotmail.comwrote in message
news:e9**************@TK2MSFTNGP02.phx.gbl...
>Hi all...
I have developed an application for managing a very large resource of artist's paintings and posts them to a web site. The application works well. I'm trying to reduce the complexity of having to work with photoshop and integrate one feature into the application Distortion Transformations.
Background Information:
When paintings are photographed, it's impossible to get a completely perfect image that requires straightening prior to cropping for a number of rasons  the photographer is not standing square on to the painting, the painting is leaning, the camera is not at the correct height, the camera causes barrel distortion, etc...
Therefore each image must be loaded into photoshop, all 4 corners selected using the polygonal lasso tool then manually applying a Distort Transformation (Edit Transform Distort) on the selected region.
The Problem:
The GDI library comes standard with several rectangular transformations  stretch, Skew, etc.. But these apply only to a perfect rectangular region where all points are perpendicular to each other.
I have no problems in selecting the nonrectangular region  this is easy. I'm stumped at trying to work out how to take this region and applying the Photoshop like Distort Transformation.
Anyone have any pointers?
Thanks in advance...
Graeme
 
P: n/a

Yes, I have a good understanding of what you're trying to do. The Bob Powell
and CodeProject references were just for the purpose of general information
about Matrices. The other 2 references are more specific, one of which goes
well into the mathematics, and one of which provides some samples of C#
Matrix math algorithms, although you will still have to create your own
matrices to do the work. But it WILL involve using Matrix transformation,
and you will have to figure out the Math.

HTH,
Kevin Spencer
Microsoft MVP
Software Composer http://unclechutney.blogspot.com
The shortest distance between 2 points is a curve.
"GraGra33" <gr******@hotmail.comwrote in message
news:uA**************@TK2MSFTNGP02.phx.gbl...
Hi...
Thanks for your suggestions  I've had a look at all the links mentioned.
Bob's and the CodeProject artile I've already looked at both and they deal
with rectangular regions (simple transformation) and not 4point polygons
(complex transformation).
I've also looked at Gimp and Paint.Net  both only deal with regions
(simple transformation) and don't have Photoshop's distort transformation
(complex transformation).
I'm trying to do 4point polygons (complex transformation) and not
rectangular regions (simple transformation). The GDI+ matrix
transformations only handle rectangular regions (simple transformation) as
far as I can ascertain.
To clarify what I'm trying to do, I'll give you another example  can send
you a sample image if you think that you know how it's done.
Example: The bottomleft and topright corners are not squared to the
Topleft & bottomright corners. To square the image, the topleft and
bottomright must stay anchored whilst the bottomleft must be distorted
towards the top and the topright corner must be distorted to the right.
Be aware that no two photos are the same and each photo will require
different distort transformation adjustments.
Do you still think that your suggestion will work or do you have another
idea?
Thanks for your help in advance,
Graeme
"Kevin Spencer" <un**********@nothinks.comwrote in message
news:e2**************@TK2MSFTNGP02.phx.gbl...
>Transformations are all done using Matrix math. This is not going to be an easy task, because you will have to understand Matrix math to do it. Here are some articles and sample code to get you started:
http://www.bobpowell.net/transformations.htm http://www.codeproject.com/csharp/ma...sformation.asp http://www.euclideanspace.com/maths/...etic/index.htm http://www.euclideanspace.com/maths/...ion_csharp.htm
 HTH,
Kevin Spencer Microsoft MVP Software Composer http://unclechutney.blogspot.com
The shortest distance between 2 points is a curve.
"GraGra33" <gr******@hotmail.comwrote in message news:e9**************@TK2MSFTNGP02.phx.gbl...
>>Hi all...
I have developed an application for managing a very large resource of artist's paintings and posts them to a web site. The application works well. I'm trying to reduce the complexity of having to work with photoshop and integrate one feature into the application Distortion Transformations.
Background Information:
When paintings are photographed, it's impossible to get a completely perfect image that requires straightening prior to cropping for a number of rasons  the photographer is not standing square on to the painting, the painting is leaning, the camera is not at the correct height, the camera causes barrel distortion, etc...
Therefore each image must be loaded into photoshop, all 4 corners selected using the polygonal lasso tool then manually applying a Distort Transformation (Edit Transform Distort) on the selected region.
The Problem:
The GDI library comes standard with several rectangular transformations  stretch, Skew, etc.. But these apply only to a perfect rectangular region where all points are perpendicular to each other.
I have no problems in selecting the nonrectangular region  this is easy. I'm stumped at trying to work out how to take this region and applying the Photoshop like Distort Transformation.
Anyone have any pointers?
Thanks in advance...
Graeme
 
P: n/a

Thanks for the quick response Kevin.
I've had a good look at GDI+ and Matricies through alot of hand coding and
all I get are simple transformations. I fail to see how GDI+ can handle
complex transformations other than rectangular regions.
Kind Regards,
Graeme
"Kevin Spencer" <un**********@nothinks.comwrote in message
news:uC**************@TK2MSFTNGP02.phx.gbl...
Yes, I have a good understanding of what you're trying to do. The Bob
Powell and CodeProject references were just for the purpose of general
information about Matrices. The other 2 references are more specific, one
of which goes well into the mathematics, and one of which provides some
samples of C# Matrix math algorithms, although you will still have to
create your own matrices to do the work. But it WILL involve using Matrix
transformation, and you will have to figure out the Math.

HTH,
Kevin Spencer
Microsoft MVP
Software Composer http://unclechutney.blogspot.com
The shortest distance between 2 points is a curve.
"GraGra33" <gr******@hotmail.comwrote in message
news:uA**************@TK2MSFTNGP02.phx.gbl...
>Hi...
Thanks for your suggestions  I've had a look at all the links mentioned. Bob's and the CodeProject artile I've already looked at both and they deal with rectangular regions (simple transformation) and not 4point polygons (complex transformation).
I've also looked at Gimp and Paint.Net  both only deal with regions (simple transformation) and don't have Photoshop's distort transformation (complex transformation).
I'm trying to do 4point polygons (complex transformation) and not rectangular regions (simple transformation). The GDI+ matrix transformations only handle rectangular regions (simple transformation) as far as I can ascertain.
To clarify what I'm trying to do, I'll give you another example  can send you a sample image if you think that you know how it's done.
Example: The bottomleft and topright corners are not squared to the Topleft & bottomright corners. To square the image, the topleft and bottomright must stay anchored whilst the bottomleft must be distorted towards the top and the topright corner must be distorted to the right.
Be aware that no two photos are the same and each photo will require different distort transformation adjustments.
Do you still think that your suggestion will work or do you have another idea?
Thanks for your help in advance,
Graeme
"Kevin Spencer" <un**********@nothinks.comwrote in message news:e2**************@TK2MSFTNGP02.phx.gbl...
>>Transformations are all done using Matrix math. This is not going to be an easy task, because you will have to understand Matrix math to do it. Here are some articles and sample code to get you started:
http://www.bobpowell.net/transformations.htm http://www.codeproject.com/csharp/ma...sformation.asp http://www.euclideanspace.com/maths/...etic/index.htm http://www.euclideanspace.com/maths/...ion_csharp.htm
 HTH,
Kevin Spencer Microsoft MVP Software Composer http://unclechutney.blogspot.com
The shortest distance between 2 points is a curve.
"GraGra33" <gr******@hotmail.comwrote in message news:e9**************@TK2MSFTNGP02.phx.gbl... Hi all...
I have developed an application for managing a very large resource of artist's paintings and posts them to a web site. The application works well. I'm trying to reduce the complexity of having to work with photoshop and integrate one feature into the application Distortion Transformations.
Background Information:
When paintings are photographed, it's impossible to get a completely perfect image that requires straightening prior to cropping for a number of rasons  the photographer is not standing square on to the painting, the painting is leaning, the camera is not at the correct height, the camera causes barrel distortion, etc...
Therefore each image must be loaded into photoshop, all 4 corners selected using the polygonal lasso tool then manually applying a Distort Transformation (Edit Transform Distort) on the selected region.
The Problem:
The GDI library comes standard with several rectangular transformations  stretch, Skew, etc.. But these apply only to a perfect rectangular region where all points are perpendicular to each other.
I have no problems in selecting the nonrectangular region  this is easy. I'm stumped at trying to work out how to take this region and applying the Photoshop like Distort Transformation.
Anyone have any pointers?
Thanks in advance...
Graeme  
P: n/a

My point was not about GDI+ as such, but that you need to use Matrix math to
do your transform. In fact, the DirectX library has a matrix class that has
quite a bit of functionality built in, and is completely configurable, which
may be useful to you, or provide you with the knowledge you need to do your
transform. I might mention that what you need is not an affine transform,
which does not provide distortion. What you need to understand is that a
matrix provides a vectorbased translation method, so what you need to do is
an orthagonal transform, to change the angle of the corners of your
rectangle. See http://msdn.microsoft.com/archive/de...rix/matrix.asp.

HTH,
Kevin Spencer
Microsoft MVP
Software Composer http://unclechutney.blogspot.com
The shortest distance between 2 points is a curve.
"GraGra33" <gr******@hotmail.comwrote in message
news:ui****************@TK2MSFTNGP03.phx.gbl...
Thanks for the quick response Kevin.
I've had a good look at GDI+ and Matricies through alot of hand coding and
all I get are simple transformations. I fail to see how GDI+ can handle
complex transformations other than rectangular regions.
Kind Regards,
Graeme
"Kevin Spencer" <un**********@nothinks.comwrote in message
news:uC**************@TK2MSFTNGP02.phx.gbl...
>Yes, I have a good understanding of what you're trying to do. The Bob Powell and CodeProject references were just for the purpose of general information about Matrices. The other 2 references are more specific, one of which goes well into the mathematics, and one of which provides some samples of C# Matrix math algorithms, although you will still have to create your own matrices to do the work. But it WILL involve using Matrix transformation, and you will have to figure out the Math.
 HTH,
Kevin Spencer Microsoft MVP Software Composer http://unclechutney.blogspot.com
The shortest distance between 2 points is a curve.
"GraGra33" <gr******@hotmail.comwrote in message news:uA**************@TK2MSFTNGP02.phx.gbl...
>>Hi...
Thanks for your suggestions  I've had a look at all the links mentioned. Bob's and the CodeProject artile I've already looked at both and they deal with rectangular regions (simple transformation) and not 4point polygons (complex transformation).
I've also looked at Gimp and Paint.Net  both only deal with regions (simple transformation) and don't have Photoshop's distort transformation (complex transformation).
I'm trying to do 4point polygons (complex transformation) and not rectangular regions (simple transformation). The GDI+ matrix transformations only handle rectangular regions (simple transformation) as far as I can ascertain.
To clarify what I'm trying to do, I'll give you another example  can send you a sample image if you think that you know how it's done.
Example: The bottomleft and topright corners are not squared to the Topleft & bottomright corners. To square the image, the topleft and bottomright must stay anchored whilst the bottomleft must be distorted towards the top and the topright corner must be distorted to the right.
Be aware that no two photos are the same and each photo will require different distort transformation adjustments.
Do you still think that your suggestion will work or do you have another idea?
Thanks for your help in advance,
Graeme
"Kevin Spencer" <un**********@nothinks.comwrote in message news:e2**************@TK2MSFTNGP02.phx.gbl... Transformations are all done using Matrix math. This is not going to be an easy task, because you will have to understand Matrix math to do it. Here are some articles and sample code to get you started:
http://www.bobpowell.net/transformations.htm http://www.codeproject.com/csharp/ma...sformation.asp http://www.euclideanspace.com/maths/...etic/index.htm http://www.euclideanspace.com/maths/...ion_csharp.htm
 HTH,
Kevin Spencer Microsoft MVP Software Composer http://unclechutney.blogspot.com
The shortest distance between 2 points is a curve.
"GraGra33" <gr******@hotmail.comwrote in message news:e9**************@TK2MSFTNGP02.phx.gbl... Hi all... > I have developed an application for managing a very large resource of artist's paintings and posts them to a web site. The application works well. I'm trying to reduce the complexity of having to work with photoshop and integrate one feature into the application Distortion Transformations. > Background Information: > When paintings are photographed, it's impossible to get a completely perfect image that requires straightening prior to cropping for a number of rasons  the photographer is not standing square on to the painting, the painting is leaning, the camera is not at the correct height, the camera causes barrel distortion, etc... > Therefore each image must be loaded into photoshop, all 4 corners selected using the polygonal lasso tool then manually applying a Distort Transformation (Edit Transform Distort) on the selected region. > The Problem: > The GDI library comes standard with several rectangular transformations  stretch, Skew, etc.. But these apply only to a perfect rectangular region where all points are perpendicular to each other. > I have no problems in selecting the nonrectangular region  this is easy. I'm stumped at trying to work out how to take this region and applying the Photoshop like Distort Transformation. > Anyone have any pointers? > Thanks in advance... > Graeme > >   This discussion thread is closed Replies have been disabled for this discussion.   Question stats  viewed: 1587
 replies: 5
 date asked: Jan 26 '07
