How to Clip a portion of an Image

[Anand Ganesh]

HI All,

I have an Image. I want to clip a portion of it and copy to another image.
How to do this? I know the bounding rectangle to clip.

Any suggestions please.

Thanks for your time and help.

Regards
Anand Ganesh

[Jonathan Schafer]

Create a graphics object from a bitmap and draw into it using the
image from the other graphics object. You can specify the source and
dest rects.

Jonathan Schafer

On Fri, 11 Jul 2003 18:49:11 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

HI All,

I have an Image. I want to clip a portion of it and copy to another image.
How to do this? I know the bounding rectangle to clip.

Any suggestions please.

Thanks for your time and help.

Regards
Anand Ganesh

[Anand Ganesh]

I tried this but I got an error
An unhandled exception of type 'System.Excepti on' occurred in
system.drawing. dll

Additional information: A Graphics object cannot be created from an image
that has an indexed pixel format.
But the problem is after clipping I need another Image object itself. The
destination should be an image but the imae should be a clipped image of the
bigger Image.

Any more suggestions please?

Regards
Anand Ganesh
"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
news:q5******** *************** *********@4ax.c om...

Create a graphics object from a bitmap and draw into it using the
image from the other graphics object. You can specify the source and
dest rects.

Jonathan Schafer

On Fri, 11 Jul 2003 18:49:11 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

HI All,

I have an Image. I want to clip a portion of it and copy to another image.How to do this? I know the bounding rectangle to clip.

Any suggestions please.

Thanks for your time and help.

Regards
Anand Ganesh

[Jonathan Schafer]

The following code works for me. It loads a .gif, draws the 30 x 30
section of the gif into an offscreen bitmap, and then draws the scaled
image into a picturebox.

System.Drawing. Bitmap bmp = new Bitmap(30, 30);
Image
img=System.Draw ing.Image.FromF ile(@"C:\cygwin \bin\openssl-0.9.6d\doc\open ssl_button.gif" );
Graphics g1 = pictureBox1.Cre ateGraphics();
g1.DrawImage(im g, 0, 0, img.Width, img.Height);
g1.Dispose();
Graphics g3 = Graphics.FromIm age(bmp);
g3.DrawImageUns caled(img, 0, 0, bmp.Width, bmp.Height);
Graphics g2 = pictureBox2.Cre ateGraphics();
g2.DrawImageUns caled(bmp, 0, 0, bmp.Width, bmp.Height);
g2.Dispose();
g3.Dispose();
bmp.Dispose();
img.Dispose();
Jonathan Schafer

On Sun, 13 Jul 2003 21:53:20 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

I tried this but I got an error
An unhandled exception of type 'System.Excepti on' occurred in
system.drawing .dll

Additional information: A Graphics object cannot be created from an image
that has an indexed pixel format.
But the problem is after clipping I need another Image object itself. The
destination should be an image but the imae should be a clipped image of the
bigger Image.

Any more suggestions please?

Regards
Anand Ganesh
"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
news:q5******* *************** **********@4ax. com...

Create a graphics object from a bitmap and draw into it using the
image from the other graphics object. You can specify the source and
dest rects.

Jonathan Schafer

On Fri, 11 Jul 2003 18:49:11 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

>HI All,
>
>I have an Image. I want to clip a portion of it and copy to anotherimage. >How to do this? I know the bounding rectangle to clip.
>
>Any suggestions please.
>
>Thanks for your time and help.
>
>Regards
>Anand Ganesh
>

[Anand Ganesh]

Hi,

See you have a .gif image. I have .tif image. May be that is the problem.
Also I am not sure how to get another image itself; instead of drawing to
the user, I should get a portion of the image and save in a file.

Regards
Anand Ganesh

"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
news:e9******** *************** *********@4ax.c om...

The following code works for me. It loads a .gif, draws the 30 x 30
section of the gif into an offscreen bitmap, and then draws the scaled
image into a picturebox.

System.Drawing. Bitmap bmp = new Bitmap(30, 30);
Image
img=System.Draw ing.Image.FromF ile(@"C:\cygwin \bin\openssl-0.9.6d\doc\open ssl
_button.gif"); Graphics g1 = pictureBox1.Cre ateGraphics();
g1.DrawImage(im g, 0, 0, img.Width, img.Height);
g1.Dispose();
Graphics g3 = Graphics.FromIm age(bmp);
g3.DrawImageUns caled(img, 0, 0, bmp.Width, bmp.Height);
Graphics g2 = pictureBox2.Cre ateGraphics();
g2.DrawImageUns caled(bmp, 0, 0, bmp.Width, bmp.Height);
g2.Dispose();
g3.Dispose();
bmp.Dispose();
img.Dispose();
Jonathan Schafer

On Sun, 13 Jul 2003 21:53:20 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

I tried this but I got an error
An unhandled exception of type 'System.Excepti on' occurred in
system.drawing .dll

Additional information: A Graphics object cannot be created from an image
that has an indexed pixel format.
But the problem is after clipping I need another Image object itself. The
destination should be an image but the imae should be a clipped image of thebigger Image.

Any more suggestions please?

Regards
Anand Ganesh
"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
news:q5******* *************** **********@4ax. com...

Create a graphics object from a bitmap and draw into it using the
image from the other graphics object. You can specify the source and
dest rects.

Jonathan Schafer

On Fri, 11 Jul 2003 18:49:11 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

>HI All,
>
>I have an Image. I want to clip a portion of it and copy to another

image.

>How to do this? I know the bounding rectangle to clip.
>
>Any suggestions please.
>
>Thanks for your time and help.
>
>Regards
>Anand Ganesh
>

[Jonathan Schafer]

Shouldn't matter. A gif file is a 256 color palette indexed image. I
only used it to show that using indexed images works.

Maybe you could post a sample of your code to see what you doing.

Jonathan Schafer

On Mon, 14 Jul 2003 09:11:54 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

Hi,

See you have a .gif image. I have .tif image. May be that is the problem.
Also I am not sure how to get another image itself; instead of drawing to
the user, I should get a portion of the image and save in a file.

Regards
Anand Ganesh

"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
news:e9******* *************** **********@4ax. com...

The following code works for me. It loads a .gif, draws the 30 x 30
section of the gif into an offscreen bitmap, and then draws the scaled
image into a picturebox.

System.Drawing. Bitmap bmp = new Bitmap(30, 30);
Image

img=System.Dra wing.Image.From File(@"C:\cygwi n\bin\openssl-0.9.6d\doc\open ssl
_button.gif" );

Graphics g1 = pictureBox1.Cre ateGraphics();
g1.DrawImage(im g, 0, 0, img.Width, img.Height);
g1.Dispose();
Graphics g3 = Graphics.FromIm age(bmp);
g3.DrawImageUns caled(img, 0, 0, bmp.Width, bmp.Height);
Graphics g2 = pictureBox2.Cre ateGraphics();
g2.DrawImageUns caled(bmp, 0, 0, bmp.Width, bmp.Height);
g2.Dispose();
g3.Dispose();
bmp.Dispose();
img.Dispose();
Jonathan Schafer

On Sun, 13 Jul 2003 21:53:20 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

>I tried this but I got an error
>
>
>An unhandled exception of type 'System.Excepti on' occurred in
>system.drawing .dll
>
>Additional information: A Graphics object cannot be created from an image
>that has an indexed pixel format.
>
>
>But the problem is after clipping I need another Image object itself. The
>destination should be an image but the imae should be a clipped image ofthe >bigger Image.
>
>Any more suggestions please?
>
>Regards
>Anand Ganesh
>
>
>"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
>news:q5******* *************** **********@4ax. com...
>> Create a graphics object from a bitmap and draw into it using the
>> image from the other graphics object. You can specify the source and
>> dest rects.
>>
>> Jonathan Schafer
>>
>> On Fri, 11 Jul 2003 18:49:11 -0700, "Anand Ganesh"
>> <an**********@h otmail.com> wrote:
>>
>> >HI All,
>> >
>> >I have an Image. I want to clip a portion of it and copy to another
>image.
>> >How to do this? I know the bounding rectangle to clip.
>> >
>> >Any suggestions please.
>> >
>> >Thanks for your time and help.
>> >
>> >Regards
>> >Anand Ganesh
>> >
>>
>

[Jonathan Schafer]

I've given you the sample code that does just that. It loads a gif
file, copies a 30 x 30 portion ( rect(0, 0, 29, 29) of the original
into the new bitmap, and draws both to a picturebox to ensure that I
am cropping the image correctly.

What more do you want?

Jonathan Schafer
On Mon, 14 Jul 2003 10:42:11 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

I don't have a code yet. This is what I wanted to do. Create a small clipped
image from a bigger image and found there is no easy way and I need some
help.

Any suggestions please?

"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
news:ac******* *************** **********@4ax. com...

Shouldn't matter. A gif file is a 256 color palette indexed image. I
only used it to show that using indexed images works.

Maybe you could post a sample of your code to see what you doing.

Jonathan Schafer

On Mon, 14 Jul 2003 09:11:54 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

>Hi,
>
>See you have a .gif image. I have .tif image. May be that is the problem.
>Also I am not sure how to get another image itself; instead of drawing to
>the user, I should get a portion of the image and save in a file.
>
>Regards
>Anand Ganesh
>
>"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
>news:e9******* *************** **********@4ax. com...
>> The following code works for me. It loads a .gif, draws the 30 x 30
>> section of the gif into an offscreen bitmap, and then draws the scaled
>> image into a picturebox.
>>
>> System.Drawing. Bitmap bmp = new Bitmap(30, 30);
>> Image
>>

img=System.Dr awing.Image.Fro mFile(@"C:\cygw in\bin\openssl-0.9.6d\doc\open ss

l

>_button.gif" );
>> Graphics g1 = pictureBox1.Cre ateGraphics();
>> g1.DrawImage(im g, 0, 0, img.Width, img.Height);
>> g1.Dispose();
>> Graphics g3 = Graphics.FromIm age(bmp);
>> g3.DrawImageUns caled(img, 0, 0, bmp.Width, bmp.Height);
>> Graphics g2 = pictureBox2.Cre ateGraphics();
>> g2.DrawImageUns caled(bmp, 0, 0, bmp.Width, bmp.Height);
>> g2.Dispose();
>> g3.Dispose();
>> bmp.Dispose();
>> img.Dispose();
>>
>>
>> Jonathan Schafer
>>
>> On Sun, 13 Jul 2003 21:53:20 -0700, "Anand Ganesh"
>> <an**********@h otmail.com> wrote:
>>
>> >I tried this but I got an error
>> >
>> >
>> >An unhandled exception of type 'System.Excepti on' occurred in
>> >system.drawing .dll
>> >
>> >Additional information: A Graphics object cannot be created from animage >> >that has an indexed pixel format.
>> >
>> >
>> >But the problem is after clipping I need another Image object itself.The >> >destination should be an image but the imae should be a clipped imageof >the
>> >bigger Image.
>> >
>> >Any more suggestions please?
>> >
>> >Regards
>> >Anand Ganesh
>> >
>> >
>> >"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote inmessage >> >news:q5******* *************** **********@4ax. com...
>> >> Create a graphics object from a bitmap and draw into it using the
>> >> image from the other graphics object. You can specify the sourceand >> >> dest rects.
>> >>
>> >> Jonathan Schafer
>> >>
>> >> On Fri, 11 Jul 2003 18:49:11 -0700, "Anand Ganesh"
>> >> <an**********@h otmail.com> wrote:
>> >>
>> >> >HI All,
>> >> >
>> >> >I have an Image. I want to clip a portion of it and copy to another
>> >image.
>> >> >How to do this? I know the bounding rectangle to clip.
>> >> >
>> >> >Any suggestions please.
>> >> >
>> >> >Thanks for your time and help.
>> >> >
>> >> >Regards
>> >> >Anand Ganesh
>> >> >
>> >>
>> >
>>
>

[Chris Hornberger]

For you to write it, of course!! Now aren't you silly?

Sorry to be cranky... I've been arguing with people all day about
self-motivation and the idea of "helping those who help themselves".

Jonathan Schafer <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message news:<ni******* *************** **********@4ax. com>...

I've given you the sample code that does just that. It loads a gif
file, copies a 30 x 30 portion ( rect(0, 0, 29, 29) of the original
into the new bitmap, and draws both to a picturebox to ensure that I
am cropping the image correctly.

What more do you want?

Jonathan Schafer

[Anand Ganesh]

Hi ,

I am sorry if I am troubling you or may be I am having difficulty
understanding the code.
Here is your code and my understanding

System.Drawing. Bitmap bmp = new Bitmap(30, 30); [ Creates an
empty bmp of size 30 x 30 ]
Image
img=System.Draw ing.Image.FromF ile(@"C:\cygwin \bin\openssl-0.9.6d\doc\open ssl
_button.gif"); [ Creates an Image Object ]
Graphics g1 = pictureBox1.Cre ateGraphics();
[ Creates a Graphics Object ]
g1.DrawImage(im g, 0, 0, img.Width, img.Height);
[ Draws the Img in the pictureBox1 using the Graphics g1 with full Img width
and height]
g1.Dispose();
[Disposed g1]
Graphics g3 = Graphics.FromIm age(bmp);
[Creating another Graphics from the Empty Bitmap 30x30]
g3.DrawImageUns caled(img, 0, 0, bmp.Width, bmp.Height); [Drawing the
unscaled image of Img also extracting the specified 30x30 portion from the
img ] [Is the clipping occurring here?]
Graphics g2 = pictureBox2.Cre ateGraphics();
[creating g2]
g2.DrawImageUns caled(bmp, 0, 0, bmp.Width, bmp.Height); [Drawing the bmp
in the picturebox]
g2.Dispose();
[From here below all are disposed]
g3.Dispose();
bmp.Dispose();
img.Dispose();

Here is my code. All I am doing is trying to clip a portion and copy to
clipboard, it is exactly same as yours. But it doesn't work.

System.Drawing. Bitmap TheClippedBmp = new Bitmap((int)thi s.ImageRect.Wid th,
(int)this.Image Rect.Height);

Graphics Gra = Graphics.FromIm age(TheClippedB mp);

Gra.DrawImageUn scaled(this.The ImagetoDraw, (int) ImageRect.X ,(int)
ImageRect.Y,(in t) ImageRect.Width ,(int) ImageRect.Heigh t);

System.Windows. Forms.Clipboard .SetDataObject( TheClippedBmp) ;

Gra.Dispose() ;

TheClippedBmp.D ispose() ;

this.statusBarP anelIBMsg.Text = "Data copied successfully !" ;

Can you tell me am I missing something here?

I really wish this will be a great lesson for me which I will not forget in
my lifetime if you could say what I am missing.

Thanks for spending your precious time to teach Newbie like me.

Regards

Anand Ganesh


"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
news:ni******** *************** *********@4ax.c om...

I've given you the sample code that does just that. It loads a gif
file, copies a 30 x 30 portion ( rect(0, 0, 29, 29) of the original
into the new bitmap, and draws both to a picturebox to ensure that I
am cropping the image correctly.

What more do you want?

Jonathan Schafer
On Mon, 14 Jul 2003 10:42:11 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

I don't have a code yet. This is what I wanted to do. Create a small clippedimage from a bigger image and found there is no easy way and I need some
help.

Any suggestions please?

"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
news:ac******* *************** **********@4ax. com...

Shouldn't matter. A gif file is a 256 color palette indexed image. I
only used it to show that using indexed images works.

Maybe you could post a sample of your code to see what you doing.

Jonathan Schafer

On Mon, 14 Jul 2003 09:11:54 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

>Hi,
>
>See you have a .gif image. I have .tif image. May be that is the problem. >Also I am not sure how to get another image itself; instead of drawing to >the user, I should get a portion of the image and save in a file.
>
>Regards
>Anand Ganesh
>
>"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message >news:e9******* *************** **********@4ax. com...
>> The following code works for me. It loads a .gif, draws the 30 x 30
>> section of the gif into an offscreen bitmap, and then draws the scaled >> image into a picturebox.
>>
>> System.Drawing. Bitmap bmp = new Bitmap(30, 30);
>> Image
>>

img=System.Dr awing.Image.Fro mFile(@"C:\cygw in\bin\openssl-0.9.6d\doc\open s

sl

>_button.gif" );
>> Graphics g1 = pictureBox1.Cre ateGraphics();
>> g1.DrawImage(im g, 0, 0, img.Width, img.Height);
>> g1.Dispose();
>> Graphics g3 = Graphics.FromIm age(bmp);
>> g3.DrawImageUns caled(img, 0, 0, bmp.Width, bmp.Height);
>> Graphics g2 = pictureBox2.Cre ateGraphics();
>> g2.DrawImageUns caled(bmp, 0, 0, bmp.Width, bmp.Height);
>> g2.Dispose();
>> g3.Dispose();
>> bmp.Dispose();
>> img.Dispose();
>>
>>
>> Jonathan Schafer
>>
>> On Sun, 13 Jul 2003 21:53:20 -0700, "Anand Ganesh"
>> <an**********@h otmail.com> wrote:
>>
>> >I tried this but I got an error
>> >
>> >
>> >An unhandled exception of type 'System.Excepti on' occurred in
>> >system.drawing .dll
>> >
>> >Additional information: A Graphics object cannot be created from an

image

>> >that has an indexed pixel format.
>> >
>> >
>> >But the problem is after clipping I need another Image object itself.

The

>> >destination should be an image but the imae should be a clipped

imageof

>the
>> >bigger Image.
>> >
>> >Any more suggestions please?
>> >
>> >Regards
>> >Anand Ganesh
>> >
>> >
>> >"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in

message

>> >news:q5******* *************** **********@4ax. com...
>> >> Create a graphics object from a bitmap and draw into it using the
>> >> image from the other graphics object. You can specify the source

and

>> >> dest rects.
>> >>
>> >> Jonathan Schafer
>> >>
>> >> On Fri, 11 Jul 2003 18:49:11 -0700, "Anand Ganesh"
>> >> <an**********@h otmail.com> wrote:
>> >>
>> >> >HI All,
>> >> >
>> >> >I have an Image. I want to clip a portion of it and copy to

another >> >image.
>> >> >How to do this? I know the bounding rectangle to clip.
>> >> >
>> >> >Any suggestions please.
>> >> >
>> >> >Thanks for your time and help.
>> >> >
>> >> >Regards
>> >> >Anand Ganesh
>> >> >
>> >>
>> >
>>
>

[Anand Ganesh]

It is not throwing Exception but I am expecting it will copy the clipped
image into a Clipboard, which it is not doing. I am really surprised.

This is such a simple issue to copy a portion of the image to clipboard and
I am not able to do.

I am really glad I have a friend who is helping me out.

This is an Image Control I am writing. This has a toolbar and few buttons.
All the buttons are working fine except the code for this "Copy" button.

Once the user zooms in to the portion of the image and when he clicks copy,
I want that zoomed portion of the image to be transfered to the clipboard.

Here is the code after the user clicks the button.

The ImageRect is a RectangleF object and I am manipulating its values as and
when the user zooms in or zooms out or pan. Then applying this ImageRect on
the original image so that the right portion of the image is drawn for the
user.

TheImage to draw is an Image Object, which has the original image.

The test image I am using has a dimension of 3592 x 2485. It is a .tif image
file.

private void toolBarIB_Butto nClick(object sender,
System.Windows. Forms.ToolBarBu ttonClickEventA rgs e)

{

this.Current_To olName = e.Button.Text ;

if (e.Button.Text == "FZoomIn")

{

float WidthFactor = ImageRect.Width / 5 ;

float HeightFactor = ImageRect.Heigh t / 5 ;

ImageRect.X = ImageRect.X + WidthFactor ;

ImageRect.Y = ImageRect.Y + HeightFactor ;

ImageRect.Width = ImageRect.Width - (2 * WidthFactor) ;

ImageRect.Heigh t = ImageRect.Heigh t - (2 * HeightFactor) ;

this.Cursor = System.Windows. Forms.Cursors.D efault ;

Invalidate() ;

}

else if (e.Button.Text == "FZoomOut")

{

float WidthFactor = ImageRect.Width / 5 ;

float HeightFactor = ImageRect.Heigh t / 5 ;

ImageRect.X = ImageRect.X - WidthFactor ;

ImageRect.Y = ImageRect.Y - HeightFactor ;

ImageRect.Width = ImageRect.Width + (2 * WidthFactor) ;

ImageRect.Heigh t = ImageRect.Heigh t + (2 * HeightFactor) ;

this.Cursor = System.Windows. Forms.Cursors.D efault ;

Invalidate() ;

}

else if (e.Button.Text == "Pan")

{

this.Cursor = new Cursor(this.Get Type(), "HandCursor.cur ");

}

else if (e.Button.Text == "FullExtent ")

{

this.ImageRect = this.Initial_Im ageRect ;

Invalidate() ;

}

else if (e.Button.Text == "ZoomIn")

{

this.Cursor = System.Windows. Forms.Cursors.C ross ;

}

else if (e.Button.Text == "ZoomOut")

{

this.Cursor = System.Windows. Forms.Cursors.C ross ;

}

else if (e.Button.Text == "Copy")

{

try

{

System.Drawing. Bitmap TheClippedBmp = new Bitmap((int)thi s.ImageRect.Wid th,
(int)this.Image Rect.Height);

Graphics Gra = Graphics.FromIm age(TheClippedB mp);

Gra.DrawImageUn scaled(this.The ImagetoDraw, (int) ImageRect.X ,(int)
ImageRect.Y,(in t) ImageRect.Width ,(int) ImageRect.Heigh t);

System.Windows. Forms.Clipboard .SetDataObject( TheClippedBmp) ;

Gra.Dispose() ;

TheClippedBmp.D ispose() ;

this.statusBarP anelIBMsg.Text = "Data copied successfully !" ;

}

catch(Exception ex)

{

MessageBox.Show (ex.Message) ;

}

}

else if (e.Button.Text == "Measure")

{

this.Cursor = System.Windows. Forms.Cursors.C ross ;

}

}
"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
news:cj******** *************** *********@4ax.c om...

See embedded comments below:

Jonathan Schafer

On Mon, 14 Jul 2003 23:49:48 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

Hi ,

I am sorry if I am troubling you or may be I am having difficulty
understandin g the code.
Here is your code and my understanding

System.Drawing .Bitmap bmp = new Bitmap(30, 30); [ Creates an
empty bmp of size 30 x 30 ]
Image

img=System.Dra wing.Image.From File(@"C:\cygwi n\bin\openssl-0.9.6d\doc\open ss

l

_button.gif" ); [ Creates an Image Object ]
Graphics g1 = pictureBox1.Cre ateGraphics();
[ Creates a Graphics Object ]
g1.DrawImage(i mg, 0, 0, img.Width, img.Height);
[ Draws the Img in the pictureBox1 using the Graphics g1 with full Img width

and height]
g1.Dispose() ;
[Disposed g1]
Graphics g3 = Graphics.FromIm age(bmp);
[Creating another Graphics from the Empty Bitmap 30x30]
g3.DrawImageUn scaled(img, 0, 0, bmp.Width, bmp.Height); [Drawing the
unscaled image of Img also extracting the specified 30x30 portion from theimg ] [Is the clipping occurring here?]
Graphics g2 = pictureBox2.Cre ateGraphics();
[creating g2]
g2.DrawImageUn scaled(bmp, 0, 0, bmp.Width, bmp.Height); [Drawing the bmpin the picturebox]
g2.Dispose() ;
[From here below all are disposed]
g3.Dispose() ;
bmp.Dispose( );
img.Dispose( );

Your comments regarding the code above are correct. The clipping
occurs on g3.DrawImageUns caled. What I've done is created a 30 x 30
rectangle of the original bitmap and copied it into a second bitmap,
thus clipping the rest of the bitmap off.

Here is my code. All I am doing is trying to clip a portion and copy to
clipboard, it is exactly same as yours. But it doesn't work.

System.Drawing .Bitmap TheClippedBmp = new Bitmap((int)thi s.ImageRect.Wid th,(int)this.Imag eRect.Height);

Graphics Gra = Graphics.FromIm age(TheClippedB mp);

Gra.DrawImageU nscaled(this.Th eImagetoDraw, (int) ImageRect.X ,(int)
ImageRect.Y,(i nt) ImageRect.Width ,(int) ImageRect.Heigh t);

System.Windows .Forms.Clipboar d.SetDataObject (TheClippedBmp) ;

Gra.Dispose( ) ;

TheClippedBmp. Dispose() ;

this.statusBar PanelIBMsg.Text = "Data copied successfully !" ;

Can you tell me am I missing something here?

So far as I can tell, this looks correct. What part doesn't work?
Are you getting an exception? If so, what is the exception and on
which line does it occur?

If you aren't getting an exception but the result is incorrect, what
part is incorrect.

If your image is small, perhaps you code attach a .zip file with the
image and your .cs file containing only the code necessary to crop the
bitmap and I could look at it in a project here.

I really wish this will be a great lesson for me which I will not forget inmy lifetime if you could say what I am missing.

Thanks for spending your precious time to teach Newbie like me.

Regards

Anand Ganesh


"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message
news:ni******* *************** **********@4ax. com...

I've given you the sample code that does just that. It loads a gif
file, copies a 30 x 30 portion ( rect(0, 0, 29, 29) of the original
into the new bitmap, and draws both to a picturebox to ensure that I
am cropping the image correctly.

What more do you want?

Jonathan Schafer
On Mon, 14 Jul 2003 10:42:11 -0700, "Anand Ganesh"
<an**********@h otmail.com> wrote:

>I don't have a code yet. This is what I wanted to do. Create a small

clipped

>image from a bigger image and found there is no easy way and I need some >help.
>
>Any suggestions please?
>
>"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in message >news:ac******* *************** **********@4ax. com...
>> Shouldn't matter. A gif file is a 256 color palette indexed image. I >> only used it to show that using indexed images works.
>>
>> Maybe you could post a sample of your code to see what you doing.
>>
>> Jonathan Schafer
>>
>>
>>
>> On Mon, 14 Jul 2003 09:11:54 -0700, "Anand Ganesh"
>> <an**********@h otmail.com> wrote:
>>
>> >Hi,
>> >
>> >See you have a .gif image. I have .tif image. May be that is the

problem.

>> >Also I am not sure how to get another image itself; instead of drawing

to

>> >the user, I should get a portion of the image and save in a file.
>> >
>> >Regards
>> >Anand Ganesh
>> >
>> >"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in

message

>> >news:e9******* *************** **********@4ax. com...
>> >> The following code works for me. It loads a .gif, draws the 30 x

30 >> >> section of the gif into an offscreen bitmap, and then draws the

scaled

>> >> image into a picturebox.
>> >>
>> >> System.Drawing. Bitmap bmp = new Bitmap(30, 30);
>> >> Image
>> >>
>>

img=System.D rawing.Image.Fr omFile(@"C:\cyg win\bin\openssl-0.9.6d\doc\open ss

>l
>> >_button.gif" );
>> >> Graphics g1 = pictureBox1.Cre ateGraphics();
>> >> g1.DrawImage(im g, 0, 0, img.Width, img.Height);
>> >> g1.Dispose();
>> >> Graphics g3 = Graphics.FromIm age(bmp);
>> >> g3.DrawImageUns caled(img, 0, 0, bmp.Width, bmp.Height);
>> >> Graphics g2 = pictureBox2.Cre ateGraphics();
>> >> g2.DrawImageUns caled(bmp, 0, 0, bmp.Width, bmp.Height);
>> >> g2.Dispose();
>> >> g3.Dispose();
>> >> bmp.Dispose();
>> >> img.Dispose();
>> >>
>> >>
>> >> Jonathan Schafer
>> >>
>> >> On Sun, 13 Jul 2003 21:53:20 -0700, "Anand Ganesh"
>> >> <an**********@h otmail.com> wrote:
>> >>
>> >> >I tried this but I got an error
>> >> >
>> >> >
>> >> >An unhandled exception of type 'System.Excepti on' occurred in
>> >> >system.drawing .dll
>> >> >
>> >> >Additional information: A Graphics object cannot be created from

an >image
>> >> >that has an indexed pixel format.
>> >> >
>> >> >
>> >> >But the problem is after clipping I need another Image object

itself.

>The
>> >> >destination should be an image but the imae should be a clipped

image

>of
>> >the
>> >> >bigger Image.
>> >> >
>> >> >Any more suggestions please?
>> >> >
>> >> >Regards
>> >> >Anand Ganesh
>> >> >
>> >> >
>> >> >"Jonathan Schafer" <jschafer@*NOSP AM*brierley.a.b .c.com> wrote in >message
>> >> >news:q5******* *************** **********@4ax. com...
>> >> >> Create a graphics object from a bitmap and draw into it using the >> >> >> image from the other graphics object. You can specify the source >and
>> >> >> dest rects.
>> >> >>
>> >> >> Jonathan Schafer
>> >> >>
>> >> >> On Fri, 11 Jul 2003 18:49:11 -0700, "Anand Ganesh"
>> >> >> <an**********@h otmail.com> wrote:
>> >> >>
>> >> >> >HI All,
>> >> >> >
>> >> >> >I have an Image. I want to clip a portion of it and copy to

another

>> >> >image.
>> >> >> >How to do this? I know the bounding rectangle to clip.
>> >> >> >
>> >> >> >Any suggestions please.
>> >> >> >
>> >> >> >Thanks for your time and help.
>> >> >> >
>> >> >> >Regards
>> >> >> >Anand Ganesh
>> >> >> >
>> >> >>
>> >> >
>> >>
>> >
>>
>